Network Engineer Mock Interview (packet level) | GOOGLE, ORACLE, AMAZON, CISCO interview questions — Transcript

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1. 0:00Yeah. Hi, Omar. How are you? Yeah. Hi,
2. 0:04sir. I'm good. Thanks for asking. I hope
3. 0:06you're doing good. Yeah, I'm fantastic.
4. 0:08I'm doing Thanks for asking again. Yeah.
5. 0:10Okay. So, yeah, I'm going to take a U
6. 0:13mark interview for network engineer
7. 0:16role. Okay. So, since you have a two
8. 0:18plus years of experience, right? So, you
9. 0:21have completed your CCNA training
10. 0:22successfully. You have completed
11. 0:24internship here, right? So this uh this
12. 0:26interview is all about scenario based
13. 0:28questions and how you will I will check
14. 0:30your uh skill set con conceptual way do
15. 0:34you have a proper concept on concepts or
16. 0:36not and packet level also I will ask you
17. 0:38okay troubleshooting wise also I will
18. 0:40ask you okay are you ready now
19. 0:43yes sir I'm ready yeah I know you are
20. 0:45ready for a long time but sorry for the
21. 0:47delay yeah okay no problem yeah okay so
22. 0:51yeah so could you please introduce
23. 0:53yourself and uh what is your roles and
24. 0:55responsibilities currently in your
25. 0:58organization. Yeah, please go ahead.
26. 1:00Now, okay, first uh thanks for giving
27. 1:02this opportunity to explain about
28. 1:04myself. Uh my name is Umayishwari Kuna.
29. 1:07I have 2 years of experience in
30. 1:09networking operations and I currently
31. 1:12working in TCS as a network engineer and
32. 1:15uh initially uh currently I'm working
33. 1:17for the Chroma project. Uh initially
34. 1:19worked in uh digital infrastructure
35. 1:20services. At that time they give me uh a
36. 1:23training in CCNA and networking uh
37. 1:25technologies and later I got a project
38. 1:27chroma and uh in this project they moved
39. 1:30me to this project. Here we are using it
40. 1:32to work on Cisco 1K uh devices and 9300
41. 1:36L3 L3 devices. And here we are using it
42. 1:40to work on any kind of hardware level
43. 1:42issues and protocol level issues. In
44. 1:44case of any hardware level issues, I
45. 1:46used it to engage with that uh
46. 1:48particular respective tag team and in
47. 1:51case of any hardware level uh failures
48. 1:53like uh fan ray or any power supplies
49. 1:56then I used to create a RMA with that
50. 1:58particular vendor team and coming to
51. 2:00protocol level issues uh in case of any
52. 2:03BGP flapping or any links goes flapping
53. 2:06or any uh ISP flaps I used to get a
54. 2:09ticket. At that time I will check our
55. 2:12internal end. Then after I use it to
56. 2:14create a ticket with that particular
57. 2:17vendor team like data or ATEL or AT&T
58. 2:21and other than this uh ticket handling
59. 2:23and I use it to do IOS upgradations and
60. 2:27we use it to do this iOS upgradation and
61. 2:29this kind of activities in maintenance
62. 2:31mode. uh like uh we we we used to work
63. 2:36on uh this kind of activities and we
64. 2:38will schedule a maintenance window and
65. 2:40for doing this activities we will follow
66. 2:42the MOP and other than this I use it to
67. 2:44do the documentation for everything.
68. 2:46Initially we have M O but if in case we
69. 2:49need to add or delete at the time of
70. 2:52doing any iOS then I use it to each and
71. 2:54everything in documentation and I will
72. 2:57submit this all documentation for my
73. 2:59senior approvals. Then yeah this is all
74. 3:01I'm I'm doing currently actively I'm
75. 3:04participating this all activities. Yeah
76. 3:06this is all my roles and
77. 3:07responsibilities. Yeah that's a
78. 3:09fantastic explanation and uh very clear
79. 3:12what exactly you think. H awesome. Yeah,
80. 3:15I have I have interviewed so many people
81. 3:17but this is a very good clear
82. 3:19explanation about your roles and
83. 3:20responsibility. Good. And yeah, let's
84. 3:23check about your networking
85. 3:24fundamentals. Okay. So, suppose uh let
86. 3:28me share my screen quickly. Okay. Yeah.
87. 3:30Okay.
88. 3:34If you see my screen right here. Yeah.
89. 3:37Yes. Suppose uh this is a switch. Okay.
90. 3:41Are you seeing right? This is a switch.
91. 3:44So PC1 is connected to PC2 and PC1 IP
92. 3:48address is 1.1 and PC2 IP address is
93. 3:501.2. Okay. And PC1 MAC address is a just
94. 3:54consider PCB MAC address PC2 MAC address
95. 3:56BB. If I initiate a ping to 1.2
96. 4:01how exactly the ping works at the back
97. 4:03end what routing protocol what uh layer
98. 4:05three protocol it use and just these two
99. 4:08are connected to the switch and explain
100. 4:10me the ping process step by step.
101. 4:12understood the topology. Okay. Yes. Yes.
102. 4:14I got it. You got it right. Yeah. Yes.
103. 4:18Okay. In PC1 if you're going to actually
104. 4:21why we using ping right for uh checking
105. 4:23the reachability the device is reaching
106. 4:25or not and we are able to check the
107. 4:27latency. How it will check the latency?
108. 4:29We will use the roundrip time. So first
109. 4:31we are going to initiate ping in PC1
110. 4:34like there is a IP address like
111. 4:36192.168.1.2
112. 4:38in PC1. it will generate a ICMP echo
113. 4:42request. So it will contain in uh layer
114. 4:453. There is a protocol number inside
115. 4:47that layer 3 in header. So based on this
116. 4:49ICMP echo protocol it will understand
117. 4:53this is ICMP uh I mean protocol. So
118. 4:56first it will initiate that ICMP uh echo
119. 4:59request in this uh that ICMP echo
120. 5:02contain the type 8 and core zero. It
121. 5:04means it's a echo request. So once it
122. 5:06reaches that switch and it will do that
123. 5:09u based on we all it's not a first time
124. 5:11ping so it will not uh it uh it able to
125. 5:14understand the MAC destination MAC
126. 5:16address so based on that uh uh it will
127. 5:18reach that PCB so once you first it's a
128. 5:22first time I'm pinging yeah okay first
129. 5:24time it's a first time pinging means it
130. 5:26will be in error I mean it will in
131. 5:28buffer state because if you're going to
132. 5:31ping from first time we don't know the
133. 5:33MAC address destination MAC address so
134. 5:35at that time the ARP request will
135. 5:37generated by the PC1. So inside the AR
136. 5:40so inside that AR request that ARP will
137. 5:43maintain the AR table. So inside that we
138. 5:46have a fields like source IP. Source IP
139. 5:48is nothing but that PC1 IP address and
140. 5:50the source MAC address. Source MAC
141. 5:52address is nothing but the PC MAC
142. 5:53address and the destination IP. I mean
143. 5:55that is a target IP. So sorry actually
144. 5:58in RP we will use command uh sender IP
145. 6:01and sender MAC and the target IP and
146. 6:03target MAC. the target IP address is the
147. 6:06destination uh I mean target IP is the
148. 6:08destination PC IP and that target MAC we
149. 6:12don't know so for identifying this t
150. 6:14target MAC address that PC1 is
151. 6:17generating this ARC so once this
152. 6:19particular packet I mean this ARC
153. 6:21request is re reached to the switch will
154. 6:24check the destination MAC first it will
155. 6:26check that I mean sender MAC so the
156. 6:29sender MAC address is the PC1 MAC
157. 6:30address and it will check the
158. 6:32destination MAC address we don't know
159. 6:34the destin destination MAC address. So
160. 6:35it will not contain any destination MAC
161. 6:37details. So at that time destination
162. 6:39here in our request what is in actually
163. 6:43destination MAC address we are able to
164. 6:45see that is a PCB MAC. How you will see
165. 6:48it's a request right? Okay. Okay. At
166. 6:51that time uh that PC and it will do the
167. 6:53end operation between the source IP and
168. 6:55the that is different. You're generating
169. 6:58a request for the destination. So in our
170. 7:01request packet you said tender IP
171. 7:03address is source IP tender MAC address
172. 7:06is source MAC what destination IP is the
173. 7:08whatever we are pinging yes what is the
174. 7:11destination MAC address here uh target
175. 7:14MAC address what is the target yes we
176. 7:16don't know the target MAC address for
177. 7:18identifying the target MAC address we
178. 7:20are generating this R request
179. 7:23request it will do the broad yeah yeah
180. 7:26now you're right it yes I'm I'm going to
181. 7:28explain the
182. 7:30So first it will do the end operation
183. 7:32between the source IP and uh destination
184. 7:35sub I mean source subnet mask
185. 7:37destination IP and the destination
186. 7:38subnet mask. If the both results are
187. 7:40same then it will generate the broadcast
188. 7:43packet to that PCB I which will do the
189. 7:46broadcast and based on this and
190. 7:48operation it will go to the PCP. So
191. 7:50based on the same subnet I mean it the
192. 7:52both result will be same subnet it will
193. 7:54go to the PCB. If the both results will
194. 7:57be different it will go to the gateway.
195. 7:58So it will that once which receive this
196. 8:00packet it will do the I mean broadcast
197. 8:02because we don't know the destination
198. 8:04MAC address right so it will do the
199. 8:05broadcast so based on the subnet mask
200. 8:08that PCB we are connected that PCB also
201. 8:11to the switch so it will receive that
202. 8:13packet and it will check that
203. 8:15destination IP address I mean that
204. 8:17target IP it's a PCB owns PCB one IP
205. 8:20address so it will reply back with the R
206. 8:23I mean R reply it uh it will generate I
207. 8:26mean it will give the information about
208. 8:28it MAC address. So once it is received
209. 8:31the switch the uh at that time it able
210. 8:33to know the I mean target MAC and target
211. 8:36uh sender MAC. So at that time it will
212. 8:38do uni cast to the our PC. So it will
213. 8:41identify the before generating our
214. 8:45request packet to the switch does switch
215. 8:48will do anything?
216. 8:51Sorry PC PCB PCB will do anything
217. 8:56before generating sorry ARP reply packet
218. 8:58to the switch
219. 9:00PCB will generate AR replay right upon
220. 9:03receiving AR request before generating
221. 9:06and sending back to switch right that AR
222. 9:08replay packet what computer PC2 will do
223. 9:13uh PC2 will check that uh that
224. 9:16destination MAC that uh table right that
225. 9:18ARP table
226. 9:20What ar table? ARP table it will check
227. 9:23or it will populate it. It will populate
228. 9:27right. I mean it it will it will learn
229. 9:29the source IP and uh so yeah source IP
230. 9:34and destination IP. What is the source
231. 9:36IP? That is the PC1 source IP and
232. 9:38destination IP is its own IP address.
233. 9:41Destination IP it's own IP. So it will
234. 9:43learn the source IP along with the MAC
235. 9:44address of source IP.
236. 9:47what ARP contains you know it will
237. 9:49populate the ARP table it contains the
238. 9:52IP address and the MAC address for the
239. 9:54respective IP okay yeah fine now now go
240. 9:58slowly okay you're saying everything
241. 10:00perfectly just decrease a little bit
242. 10:05yeah now replay packet go to the switch
243. 10:06now what exactly will happen now uh here
244. 10:09we are we know I mean switch able to I
245. 10:12mean uh switch able to know the
246. 10:13destination MAC here so it will send uh
247. 10:16that our reply packet to the PCA through
248. 10:19uniccast because we already know that uh
249. 10:21destination MAC and I mean target MAC
250. 10:23and central MAC address. So once that
251. 10:26PC1 is learned that uh MAC address then
252. 10:29the ICMP echo request packet will go to
253. 10:32the PCB. So once PCB is received and it
254. 10:35will do that roundrip time and it will
255. 10:37check and it will come back with the
256. 10:39ICMP echo reply packet. In this echo
257. 10:42reply packet we will contain the type
258. 10:44zero code zero. Mhm. Okay. So this is
259. 10:47the process behind this ping and the
260. 10:49arc. Okay, that's a fantastic thing. Use
261. 10:52this fancy keywords called if any frame
262. 10:54received by switch, right? Use the
263. 10:56keyword called MAC lookup. Frame frame
264. 10:59and it will do MAC lookup. It means it
265. 11:01will check the MAC address right
266. 11:03destination MAC address and MAC address
267. 11:04table and also you missed only one point
268. 11:07like it will learn the source MAC
269. 11:08address also in MAC table, right? Yeah.
270. 11:11Yes. Yes. It will learn the source MAC
271. 11:12address and it will store that source
272. 11:14MAC. That's fine. Totally fine. Whatever
273. 11:16you said is it's a fantastic ma. I
274. 11:18didn't expect this from really awesome.
275. 11:20Okay. Now, now uh coming to the DNS
276. 11:24process, right? So, okay. Just I'm
277. 11:26typing w.tungabadranetworks.com
278. 11:29orin in my website. What exactly will
279. 11:32happen at the back end? Can you please
280. 11:34explain the process? Yeah. Okay. Sure.
281. 11:36Uh just consider the PC. First, we are
282. 11:38going to uh go to the web uh any browser
283. 11:41and we are going to search
284. 11:42ww.ungabatra.com tungatra.com as a human
285. 11:45we are able to understand this but as a
286. 11:47local mission it will unable to
287. 11:49understand this ww.tungabatra.com
288. 11:50tongabatra.com. So for local machine
289. 11:53understanding it needs IP address. So
290. 11:55first that local machine will check its
291. 11:57local catch that particular IP address
292. 12:00is available or not in its local catch.
293. 12:02If it is available in its local catch,
294. 12:05it will establish a connection with that
295. 12:07particular web application using port
296. 12:09number 53 TCP connection. It will
297. 12:11establish a is it use 53?
298. 12:15Okay, I'll give you a hint. I'll give
299. 12:16you hint. So if you type ww.google.com,
300. 12:18google.com you will see some thing right
301. 12:21https or something. Yeah it will yeah it
302. 12:24will use a https uh and it will what is
303. 12:27the port number of https https port
304. 12:30number it will use 443 port number and
305. 12:33why 53 comes in the picture. Uh actually
306. 12:36normal scenario uh if you need a bulk
307. 12:39information it use 53. Okay, whatever
308. 12:42you said right, it is correct. It will
309. 12:44establish a connection with the server,
310. 12:45but the port number is 443, not 53.
311. 12:48Yeah, now continue. Now continue. Yeah,
312. 12:50please go ahead. It will use the port
313. 12:52number 443 and it will establish a
314. 12:54connection with the server using TCP
315. 12:573-way handshake. If it is avail that IP
316. 13:00address is available in local catch. If
317. 13:02in case that particular IP address is
318. 13:04not available in its local catch, it
319. 13:07will send a uh
320. 13:10sorry a recursive query to the DNS
321. 13:12resolver. So in DS DNS resolver also it
322. 13:15will check its local catch the
323. 13:16particular website IP address. I need a
324. 13:18packet level. It will use the UD. Okay.
325. 13:20It will use the UDP port number 53 here.
326. 13:23So uh here yeah go ahead. Is it? Yeah,
327. 13:26it's correct. Only before going to
328. 13:28transport layer field, explain me layer
329. 13:31three fields also. What is the
330. 13:33destination IP? Source IP. Okay. Okay.
331. 13:35Okay. The source IP is that uh PC uh IP
332. 13:39and the destination IP. Whatever you are
333. 13:42going to search that a particular
334. 13:43application, right? We are going to
335. 13:44search ww.tungabadranetwork.com.
336. 13:47We don't know that IP. For identifying
337. 13:49that IP, we are using this DNS resolver.
338. 13:52So at that time it will use the UDP
339. 13:54packet. uh and it will use the port
340. 13:56number 53. Yeah, you forgot to tell IP.
341. 13:58What is the destination IP? IP uh
342. 14:01destination IP. We don't know the
343. 14:02destination. That is a DNS resolver IP.
344. 14:06That that is correct. It's a DNS
345. 14:07resolver IP. You already told it but
346. 14:09didn't mention. Yeah, please go ahead
347. 14:10Mark. Yeah. Okay. It's a DNS resolver
348. 14:12IP. Then once DNS resolver reach this
349. 14:15request, it will check its local catch
350. 14:18that particular website application IP
351. 14:20is available or not inside its local
352. 14:22catch. If it is available the DNS
353. 14:25resolver will generate a nonrecursive uh
354. 14:28packet to the PC. If in case that
355. 14:31particular IP is not available in DNS
356. 14:33resolver catch, it will generate a
357. 14:36recurs I mean it try to query to the
358. 14:38root server. We have 13 root servers.
359. 14:40Here that source IP is the DNS resolvers
360. 14:43IP and the destination IP is the root
361. 14:45server IP. So uh here yeah and here it
362. 14:50will check that root server it will not
363. 14:52contain that authorative server IP
364. 14:54address but we have a 13 root servers
365. 14:56and it will provide the top level uh top
366. 15:00uh level domain server IP address. So
367. 15:02once uh it will generate that that again
368. 15:05that DNS resolver will establish a uh I
369. 15:09mean it request to that top level
370. 15:12domain. Okay. uh here that uh source IP
371. 15:15is that uh DNS resolver IP and that uh
372. 15:18destination IP is the top level domain
373. 15:20server IP. Here in top level domain
374. 15:23server that uh it will be uh like
375. 15:25classified like com.in.org.uk
376. 15:29based on that we're able to identify our
377. 15:32particular author server IP address. So
378. 15:35here also we are unable to get that our
379. 15:37application IP but the top level uh
380. 15:39domain server will provide the author to
381. 15:42server IP. So once we get that
382. 15:44authorative server IP address then again
383. 15:46DNS resolver will uh send that iterate
384. 15:49to query I mean uh yeah iterate to query
385. 15:52to that authorative server. So here that
386. 15:54source IP is the DNS resolver IP and the
387. 15:58destination IP is the authorative server
388. 15:59IP. So here we are able that authorative
389. 16:02server will respond with that whatever
390. 16:05we are asking whatever we are searching
391. 16:06for that our particular website it will
392. 16:08provide that particular IP address to
393. 16:10our domain I mean DNS resolver once we
394. 16:14got that IP address that DNS resolver
395. 16:17will respond to the PC in the form of uh
396. 16:20non-recursor non-recursor type it will
397. 16:23generate that IP address once our uh PC
398. 16:26will get that IP address again it will
399. 16:29establish the connection with that
400. 16:31particular web application server using
401. 16:33the port number 443 and finally you got
402. 16:36the IP address
403. 16:38network so you said TCP 3-way handshake
404. 16:40process right can you explain what is
405. 16:42that yeah uh in TCP handway uh I mean
406. 16:46TCP 3way handshake process first that uh
407. 16:50TCP will uh send a sync packet to the
408. 16:53server syn uh syn means uh at the time
409. 16:55of generating that TCP header uh we have
410. 16:58that options like uh flags inside that
411. 17:01we will uh that at the time of sending
412. 17:03the sin packet will be one. So at that
413. 17:06time we are able to know we are
414. 17:07generating the sin packet. So in the sin
415. 17:09packet uh why we are generating the send
416. 17:11packet means we need to establishing the
417. 17:13connection with the server right. So for
418. 17:15establishing the connection with the
419. 17:17server we are establishing using the
420. 17:19sequence number. So for that that uh
421. 17:22server is uh replying back with the
422. 17:24simplest act. Simple hack means whatever
423. 17:26you are I mean requesting. So for that
424. 17:29I'm giving the acknowledgement at the
425. 17:31time of reply packet we are able to see
426. 17:33that uh uh like sin is equal to one and
427. 17:36that uh act is equal to one means we are
428. 17:39getting the acknowledgement from that
429. 17:40server. So again uh we will get we will
430. 17:43that PC will generate the
431. 17:44acknowledgement. So we are getting the
432. 17:46acknowledgement from that particular
433. 17:48server. So at that time inside that
434. 17:50packet we are able to see the act is
435. 17:52equal to one. Okay. So this is the three
436. 17:54three-way handshake who will give
437. 17:55acknowledgement
438. 17:58uh that particular server server
439. 18:00acknowledgement that application uh no
440. 18:04this PC PC will give the acknowledgement
441. 18:06yeah you're saying correct only you know
442. 18:08be cautious okay yeah the the computer
443. 18:12will give acknowledgement to the server
444. 18:13then what will happen then threeway
445. 18:15handshake process complete three-way
446. 18:17handshake will channel will be yeah
447. 18:21then after that some TLS magic that is
448. 18:23necessary not necessary necessary
449. 18:26cool fine uh that's a fantastic answer
450. 18:30and now I'm moving to the DCP so now
451. 18:35my computer doesn't have any IP address
452. 18:37and all so we I what is DNC we need DCP
453. 18:42right in that case what is DCP how
454. 18:44exactly it will res it will assign IP
455. 18:46addresses to the computer can you please
456. 18:48explain the process yeah sure uh why
457. 18:51DHCP means So for our uh local missions
458. 18:54we need a IP address. So for
459. 18:55automatically assignment it will take a
460. 18:58long process. It is a time taking
461. 19:00process. So for manual assignment we are
462. 19:02using the DHCP server. HCPS correct your
463. 19:05statement you're mixing you're you know
464. 19:09oppositely you're saying manually it
465. 19:11will take time right sorry sorry sorry
466. 19:13manually manually sending it will take
467. 19:15time for for that we are using DHCP for
468. 19:19automatic assignment of IP address mask
469. 19:21and DNS resolver so at that time we will
470. 19:24configure one okay you're saying
471. 19:27everything is correct so by you know
472. 19:30like jet speed you're going so you're
473. 19:33jumping the things but we really will
474. 19:35lama just decrease your speed and
475. 19:39everything will be all right. Yeah,
476. 19:40please go ahead. Yeah. Yeah. So, first
477. 19:43that DHCP is maintain a high level the
478. 19:46speed speed only. Okay. Please go ahead.
479. 19:49Yeah. Uh dynamic host configuration
480. 19:52protocol HCP means yeah for uh assigning
481. 19:55IP address automatically we are using
482. 19:57DHCP. Yeah. So inside this DHCP we will
483. 20:01follow the DOA process for assigning the
484. 20:03IP address. Uh first the the first one
485. 20:05is the Dora. Dora is nothing but the
486. 20:08discover. We are going to discover first
487. 20:10PC will generate the Dora I mean Dora
488. 20:13request like that's a discover not Dora
489. 20:16discover discover to that particular
490. 20:18DHCP. So for getting that uh particular
491. 20:22IP address we need to configure a DHCP
492. 20:24for with the IP address first. So DCP
493. 20:27server is already configured here. Okay.
494. 20:29Cool. And all so my client is here. Now
495. 20:32tell Yeah. Now that client will uh send
496. 20:35a discovery I mean discover message to
497. 20:38that uh I mean the HCP server. So once
498. 20:41uh discover message is sent to that
499. 20:43particular server I mean that HCP server
500. 20:46server will uh server will give that uh
501. 20:49uh offer like uh it will offer
502. 20:52particular IP address to that PC. Sorry
503. 20:54to interrupt you before going to offer
504. 20:56right. So the client will send a discord
505. 20:58message. May you know the which
506. 21:00transport layer protocol it will use DCP
507. 21:03uh DHCP it will use UDP. What is the
508. 21:06source port and destination port here?
509. 21:08Source port at the time of from PC side
510. 21:10that the source port is the 68 and from
511. 21:13that destination port is the 67 from the
512. 21:15PC side. Perfect. Now, now the server
513. 21:19server receives this discord message and
514. 21:22uh this again server what server will
515. 21:24do? Uh server will give that offer. I'm
516. 21:28going to providing this particular IP
517. 21:30address to you. So it will be in offer
518. 21:33message. So once that PCs receives this
519. 21:36offer message, it will Yeah, it receives
520. 21:39the offer, right? What are the options
521. 21:42you will see in offer message?
522. 21:44uh in offform message I'm able to see
523. 21:46the option 50 option 50 is the client
524. 21:49identifier and option 51 is the option
525. 21:5350 option requested requested IP address
526. 21:56option 50 is the requested IP it's it's
527. 21:58a offer right it's offering means it is
528. 22:01saying it's per IP then after there is
529. 22:03some options what is option one uh
530. 22:06option one is a subnet mask very good
531. 22:08what is the option six option six is the
532. 22:12DNS domain name server IP. Okay. What is
533. 22:16option three?
534. 22:17Option three is that uh uh router gate I
535. 22:21mean subnet mask I mean gateway IP
536. 22:24address router IP router IP and you you
537. 22:27DNS and subnet mask and IP you told it
538. 22:30right and there is a one thing lease
539. 22:31time option lease time
540. 22:35uh sorry lease time that option do you
541. 22:38remember that option lease time option
542. 22:41uh lease type option is uh 51 uh yeah
543. 22:45yeah 51 51 51. Yeah, 51 is the X. Okay,
544. 22:49now you receive the offer. Now what PC
545. 22:52will do? Please go ahead. PC will uh
546. 22:55request whatever you are going to
547. 22:57offering to that IP address, particular
548. 22:59IP address, please assign to me and it
549. 23:02will request to that uh our uh the HCP
550. 23:05server. Okay.
551. 23:08uh once it is request based on that
552. 23:10request uh it will acknowledge whatever
553. 23:13it's already offered and it will assign
554. 23:15that particular IP address subnet mask
555. 23:17and uh that router IP to that uh PC okay
556. 23:20perfect now it is uh assigned so all
557. 23:22these discover offer request and
558. 23:25acknowledge right these packets are all
559. 23:27what kind of packets is this broadcast
560. 23:29packets or it is uniccast or what these
561. 23:31all are no this all are broadcast
562. 23:33packets because uh we don't know right
563. 23:35that we are going to request Which one?
564. 23:37So it those all are uh broadcast packets
565. 23:40only. Yeah. Okay. Perfect. That's
566. 23:42fantastic. Okay. So RPC which layer
567. 23:45protocol? Uh RPC layer 2 protocol but it
568. 23:49carries the layer three right? Yeah but
569. 23:52it will use that uh layer 3 payload by
570. 23:55uh because it going to use that
571. 23:57particular IP address to identify the
572. 23:59MAC address. So that's why it will carry
573. 24:02that uh L3 layer uh layer three pay.
574. 24:05Perfect. Perfect. Fantastic answer.
575. 24:09Very nice. And next um Okay. So, what is
576. 24:12the port number of SSH?
577. 24:15Uh SSH port number is 22. What is the
578. 24:18port number of uh HTTP?
579. 24:22HTTP port number 80. Tnet
580. 24:2523.
581. 24:27Fantastic. Okay. Now moving to routing.
582. 24:30Okay. Basics are perfect. Okay. Let's
583. 24:32move to routing. Which routing protocol
584. 24:34you familiar with?
585. 24:36Uh I'm familiar with the OPF and PGP.
586. 24:40Okay fine. Let's go with OPF. So uh I'll
587. 24:45just directly ask you the questions. Now
588. 24:46you're good at packet level. Okay. So
589. 24:49I'll just ask the questions. Just tell
590. 24:50me you know. So how many OPF packets we
591. 24:53have? Uh we have a five packets. Uh the
592. 24:56first one is the hello packet. Second
593. 24:58one is the database description packet.
594. 25:00The third one is the link state request.
595. 25:03uh link state uh update and link state
596. 25:05acknowledgement very nice and if I
597. 25:08configure OPF between two routers can
598. 25:11you explain the states and adjacency
599. 25:12process yeah actually uh let's consider
600. 25:16the two routers R1 and R2 in between
601. 25:18that we configure the OPF actually we
602. 25:21have seven state in OPF that neighbor
603. 25:24discovering states the first we
604. 25:26configure that OPF right in between the
605. 25:28first two routers in uh in down state
606. 25:32once we configured that will be more
607. 25:34initialization state. In initialization
608. 25:36state that R1 will send that hollow
609. 25:38packet with the OPF fields. So once that
610. 25:42R2 received this it will check that all
611. 25:44fields are matched or not with the R2
612. 25:46fields except that router ID that router
613. 25:49ID should be unique. Yeah. So once this
614. 25:51all fields are matched with the fields
615. 25:54other than router ID. Can you please
616. 25:55tell me the fields if you remember
617. 25:56whatever you remember? Yeah. It's a
618. 25:58version router ID area ID and subnet
619. 26:01mask. This all the fields it should
620. 26:03match with the R2 uh router fields also.
621. 26:07Remember any authentication thing? Yeah.
622. 26:09Authentication type and uh
623. 26:11authentication
624. 26:13uh like authentication thing I'm not
625. 26:15able to authentication also there right?
626. 26:17OP of authentication. Yeah. Yeah. Yes.
627. 26:19Authentication also version type and
628. 26:22authentication and authentication type
629. 26:25and data as well.
630. 26:27Yes. Data. Yeah. These parameters are
631. 26:29now it's matched. Now please go ahead.
632. 26:31Now once it is matched with the R2 then
633. 26:35R2 it will rec R2 will recognize R1 is
634. 26:38its neighbor and it will send another
635. 26:40hello packet to R1 and in at the time of
636. 26:43sending the hello packet it will place
637. 26:45the active neighbor field inside the
638. 26:47active neighbor field it will place the
639. 26:49R1 router ID. So once uh once that uh it
640. 26:53will send that hello packet from the R2
641. 26:55that R1 it will be in initialization
642. 26:58state and it will waiting for that R1
643. 27:00route I mean uh any hello packet uh and
644. 27:03before starting I missed one point it
645. 27:05will uh go through with that uniccast IP
646. 27:08that is a 224.0.0.5 0.5 it is sorry
647. 27:12multiccast okay cool okay so hello
648. 27:16packets are exchanged through multiccast
649. 27:17IP multiccast IP this is I mean this is
650. 27:20for only OSP of groups only so once uh
651. 27:24it is that hollow packet is sent by the
652. 27:27R2 so it is receive that R1 is receive
653. 27:30actually it will wait for any hello
654. 27:32packets is come from any other neighbors
655. 27:34so once it is received that hello packet
656. 27:37from the R2 it will check that in hello
657. 27:39packet get that act to neighbor field it
658. 27:42will see its own router ID then it will
659. 27:45recognize R2 is recognizing R1 as a
660. 27:47neighbor so then this the what I was
661. 27:50saying the same process will be happen
662. 27:52in R2 side uh it will do by uh it will
663. 27:55uh um it will do like birectionally from
664. 27:58the R2 side also once this both will
665. 28:00exchange this hello packet it will move
666. 28:02to two-way state once it will move to
667. 28:04two-way state that both neighbors will
668. 28:06discover and in uh two-way state After
669. 28:09discovering that neighbors uh it will
670. 28:12elect the DRBDR elections. Why BDR
671. 28:15elections? Means for avoiding the
672. 28:16duplicate LS we are going to elect the
673. 28:19DRBDR elections. Then after the packet
674. 28:22will move to I mean after it will move
675. 28:24to that extract state. In extract state
676. 28:27that data synchronization process will
677. 28:29start by exchanging the DBD packet.
678. 28:33Yeah, here that in extract state the
679. 28:35both routers will elect m and slave
680. 28:38elections will happen by exchanging the
681. 28:41type one ls. So uh how it will we'll
682. 28:44exchange the type one uh election or
683. 28:47after master slave after master slave
684. 28:50only it will exchange the type how they
685. 28:51will elect master slave on what basis?
686. 28:53Uh actually it will elect based on the
687. 28:55router ID. Uh the highest router ID will
688. 28:58be the master and the lowest router ID
689. 29:01is the slave. So uh the router uh
690. 29:03highest router id is the master right at
691. 29:05that time we will able to see inside
692. 29:07that the packet ms bit is equal to one
693. 29:09and in uh that slave packet ms is equal
694. 29:12to zero. So first that uh the slave will
695. 29:15start exchange I mean slave will start
696. 29:17advertising I mean sending that type
697. 29:20type analysis yeah type one analysis
698. 29:23then after receiving type one analysis
699. 29:25from the slave then again master will
700. 29:28start sending that type one analysis. So
701. 29:30they both will exchange the type oneis
702. 29:33then after the both will move to u
703. 29:38exchange state here the total type one
704. 29:40alyssis exchange will happen. So then
705. 29:43after the both will move to loading
706. 29:45state. In loading state uh uh it will
707. 29:47ask any u missing router updates are
708. 29:50there. So how it will uh based on that
709. 29:53link state update, link state
710. 29:55acknowledgement. I mean link state
711. 29:57request, link state update and link
712. 29:58state acknowledgement. So based on that
713. 30:01uh that DR DR will uh exchange that type
714. 30:06LS. We already that DRBDR elections is
715. 30:09happening two two-way state. So based on
716. 30:11that we will exchange that missing or
717. 30:13routing updates that is the network
718. 30:14information. So here the type two LSS
719. 30:17will exchange. So after it will after
720. 30:20come only type two type yeah type two LS
721. 30:24why not type three and type four type
722. 30:26five
723. 30:27uh actually type three type four it's
724. 30:30another scenario first it will uh in
725. 30:32inside the area I'm telling okay got it
726. 30:35got it totally got it yeah please go
727. 30:37ahead yeah okay inside the area that
728. 30:40particular area only it is exchanging if
729. 30:42it is other than other area then we will
730. 30:44able to know the type three analysis So
731. 30:48here it will exchange and after it will
732. 30:51move to full state. In full state it
733. 30:53will use that discuss algorithm. Then it
734. 30:56will elect the best path and it will
735. 30:58install that particular uh I mean path
736. 31:00to that routing table. This is the
737. 31:02process behind that OPF. That's a
738. 31:04fantastic answer. I can whatever you are
739. 31:07saying is resembling meanings of me you
740. 31:09know whatever I use the keywords the
741. 31:11scenarios. Very good Mark. First time
742. 31:13I'm encountering there's a person what
743. 31:16exactly expected answer right same thing
744. 31:19I expecting from you of course there are
745. 31:21small small things are there to
746. 31:23improvise but that is not considered
747. 31:25it's a it's a very good answer very nice
748. 31:28okay so what is TI LSA
749. 31:32uh TYI LSA is nothing but the external
750. 31:34SA let's consider two autonomous systems
751. 31:37we configured elaborate I understood
752. 31:39totally you got it just tell me what is
753. 31:41TY LSA
754. 31:43Ty Ty LS is a external LSA if you want
755. 31:47to reach any external prefixes. uh
756. 31:49actually OPF is a database link link
757. 31:52state database protocol right if you
758. 31:54want to uh understand any protocol so
759. 31:57through LSA only we are able to
760. 31:59understand so for external prefixes so
761. 32:02we need that type LSA it will convert
762. 32:04that external prefix gen
763. 32:07will generate that type LSA will
764. 32:10generate type three LSA
765. 32:12ABR of that area ABR will generate the
766. 32:16type three LSA what is type three LSA
767. 32:18what information it contains? Uh, type
768. 32:21three LSA contain that summary of that
769. 32:24type one and type two LSA. It contain
770. 32:26the type one and type two LS. So for
771. 32:28reaching that another area routes we
772. 32:30will use it will convert the type one
773. 32:32type two LS into type three LSA. Now who
774. 32:35is ASBR and sorry who will generate ASBR
775. 32:38summary LSA the type four uh that ABR
776. 32:41will generate that uh type for LSS that
777. 32:44ASBR somewhere LS because of that for
778. 32:47internal routes that internal area
779. 32:49routes we don't know who is the ASBR so
780. 32:51for reaching that ASBR first we need to
781. 32:53reach that ABR router so inside that LSA
782. 32:56it will contain that link state I mean
783. 32:58advertising router and the link state ID
784. 33:00that link state ID is the ABR uh router
785. 33:03ID and that uh advertising router ID is
786. 33:06that uh this particular uh yes router ID
787. 33:10yeah correct ABR router ID that's fair
788. 33:13enough okay so coming to BGP why we use
789. 33:16BGP
790. 33:17for external prefix if you want to
791. 33:20establish a routing protocols between
792. 33:22the different autonomous systems we will
793. 33:24use this BGP okay perfect what is the
794. 33:27BGP TCP port number
795. 33:30BGP TCP port number it will use 179
796. 33:33Okay. So, how many states we have in
797. 33:35BGP? Just tell me the states. That's
798. 33:37okay. In BGP, we have a six state. The
799. 33:39first one is the ideal state. Next one
800. 33:41is the connect. Uh third one is the
801. 33:43active. The uh the next one is the open
802. 33:45send BGP open send state. BG open
803. 33:48confirm. And the final one is
804. 33:50established state. Perfect. So, how many
805. 33:52BGP messages we have? Uh we have a four
806. 33:55BGP messages. Uh the first one is a open
807. 33:58message, keep alive, notification, and
808. 34:00update. Perfect. Okay. Now uh how many
809. 34:04attributes we have in BGP? What are the
810. 34:06attributes? We have well-known
811. 34:08attributes. We have three attributes. So
812. 34:10uh I mean PR IP that is a neighbor IP.
813. 34:13Yeah. Per IP we call what? Neighbor that
814. 34:16is the neighbor IP. It's called next
815. 34:18hop, right? Yeah. Next hop. Okay. Uh
816. 34:21next hop and that aspath origin. This
817. 34:24three is the wellknown discretionary.
818. 34:28Uh wellknown discretionary. Just tell me
819. 34:30one
820. 34:34if you want to influence outbound
821. 34:35traffic we use that that uh local
822. 34:38preference. Perfect. Yeah, local
823. 34:40preference. Yeah, fair enough. Fair
824. 34:42enough. Okay. Yeah. Do you know the BGP
825. 34:44path selection process by any chance?
826. 34:47Uh yes I know. Yes I know. Please
827. 34:50explain how it will alert the best path
828. 34:51in BGP. So first it will uh check that
829. 34:54next value. First it will go with the
830. 34:56next hop. Then highest local preference.
831. 34:59Then shortest uh uh AS value, shortest
832. 35:01origin. Then uh smallest immediate
833. 35:04value. Then EBGP uh P I mean EBGP um RO
834. 35:09prefers IBGP.
835. 35:12Uh then uh next it will go to that
836. 35:14oldest route.
837. 35:16Great ma. Very good. So first is nexttop
838. 35:20reachability. It will not check nexttop.
839. 35:21It should say nexttop reachability.
840. 35:23Okay. So you're good at BGP. So now
841. 35:26coming to switching. What is STP? Why we
842. 35:28need STP? Uh STP is a uh loop loop
843. 35:32avoidance mechanism inside a switches.
844. 35:34It's by default uh in switches by
845. 35:37default it will be there. So what uh we
846. 35:39are using the STP like uh in any uh
847. 35:42redundant environment like switch one,
848. 35:44switch two, switch three is connected in
849. 35:45red I mean redundant environment at that
850. 35:47time STP will avoid the sloops. Okay.
851. 35:50How it will block one port. Okay. Block
852. 35:53one port. Okay. How how it will choose
853. 35:55blocking one port? What is the mechanism
854. 35:57inside the STP? Actually, first these
855. 35:59three uh switches will start sending the
856. 36:02BPDU frames. So by sending the BPDU
857. 36:04frames, it will elect that root bridge.
858. 36:06Root bridge how it will elect? We have a
859. 36:08bridge ID. Bridge ID is equal to
860. 36:10priority plus MAC address. Priority we
861. 36:12have by default 32768. If you want to
862. 36:15choose any particular switch ID, we are
863. 36:17able to adjust that priority. Then it
864. 36:20will go to lowest MAC address. So based
865. 36:22on that it will elect that uh root
866. 36:24bridge then after so there's the one
867. 36:26thing one more thing is there in bridge
868. 36:28ID
869. 36:30priority is there very good priority MAC
870. 36:33address is there priority plus one more
871. 36:36field is there what is that
872. 36:40v ID right yeah vid by default we have v
873. 36:44ID one right 368 + one that is a
874. 36:47priority yeah perfect bridge ID based on
875. 36:51the lower bridge ID what it will elect
876. 36:53based on the lower bridge ID it will
877. 36:55elect that root bridge perfect now root
878. 36:58bridge is elected so what is the next
879. 37:00yeah then it will elect that root port
880. 37:03how it will elect a root port means
881. 37:04based on the lowest interface cost we
882. 37:06have a so many interfaces cost like for
883. 37:09ethernet we have a 100 and fast ethernet
884. 37:11we have a 19 and gigabit we have a four
885. 37:13and 10g we have a one so based on the
886. 37:16lowest interface cost it will root port
887. 37:19then after it will comes to the blocking
888. 37:22port that it will comes again that uh
889. 37:24bridge ID what is the highest bridge ID
890. 37:26then it will elect that as port as a uh
891. 37:29blocking port and it will block that
892. 37:30port highest one blocking the port
893. 37:32fantastic and now what is the difference
894. 37:35between STP and RSTP
895. 37:37the main difference is the convergence
896. 37:39times and the states uh in STP we have
897. 37:42the convergence time is a 50cond and in
898. 37:45RSTP the convergence uh time is the 15
899. 37:47seconds in STP we are able to see the
900. 37:49four states from forward I mean from
901. 37:51blocking to forward but in RSTP we are
902. 37:54able to see only two states. Okay. What
903. 37:57are those? Uh in STP the first one is a
904. 38:00blocking uh listening learning and that
905. 38:03forwarding. And coming to the RSTP we
906. 38:06have only learning and forwarding state
907. 38:07we are able to see. Okay. Fantastic. And
908. 38:11do you know why we use uh BPDU guard?
909. 38:15Yeah, for we are using the BPD guard
910. 38:18like if you are enabling any edge ports
911. 38:20with the part port fast features at that
912. 38:24time uh by mistakenly any field engineer
913. 38:26any other uh our engineer is trying to
914. 38:29connect any L2 switches. So at that time
915. 38:32the BPDU frames will come right. So if
916. 38:35upon seeing that BPDU frames we are
917. 38:37enabling that BPD code here. So at that
918. 38:39time that port will be go to error
919. 38:41disabled state and uh uh yeah for going
920. 38:44it will uh that port will be in disabled
921. 38:47state and it will go to red disabled
922. 38:49state and why why we are doing this
923. 38:51generally why because uh if you're going
924. 38:56to just uh just consider scenario like
925. 38:58one switch is connected that edge port
926. 39:00is connected to that any server like any
927. 39:02DHCP server right so it's a layer three
928. 39:05devices it will not generate any kind of
929. 39:07BPDU frames and will not get any loops
930. 39:09for from that server. So at that time no
931. 39:11need of this convergence time. So in
932. 39:13networking each and every second it will
933. 39:16be we need to uh use right. So for that
934. 39:19for immediate forwarding we will create
935. 39:21that port fast. So at that time by
936. 39:23mistake any field engineer trying to
937. 39:25connect any L2 uh like to switch any uh
938. 39:29uh mean yeah on this port. So at that
939. 39:32time the BPDU frames will try to come
940. 39:34right. So at the time of what will
941. 39:36happen if I by mistake BPD frames came
942. 39:38here then what will happen actually we
943. 39:41are not uh uh I mean configure any BPD
944. 39:44you got uh that loops will occur at that
945. 39:47time the loop will occur that is the
946. 39:50answer okay I'm expecting nice and the
947. 39:53final question I'm going to ask is VRP
948. 39:55do you know what is VRP yes I know VRP
949. 39:59could you please explain VRP yeah VRP
950. 40:02it's a uh virtual ual router redundancy
951. 40:05protocol for achieving a high level
952. 40:07redundancy I mean virtual level
953. 40:10redundancy we are using this VRP like uh
954. 40:13in our uh enterprise environment we have
955. 40:16a two uh routers like in each side right
956. 40:18we're using that both in redundance
957. 40:21environment so for uh both routers we
958. 40:24are unable to give the IP address same
959. 40:26IP address if you're going to give any
960. 40:28same IP address that will calculate and
961. 40:31duplicate IP address will calculate but
962. 40:33In pieces also we are unable to give
963. 40:36that two IPs as a gateway gateway. Yeah
964. 40:39correct that's correct. Single gateway.
965. 40:41So at that time what we are going to do
966. 40:43right we are creating the VRP group.
967. 40:44It's a virtual group. So at that time
968. 40:47based on the priority we are able to
969. 40:48give same IP address to the PC. So based
970. 40:52on the priority that uh the PC will uh
971. 40:55able to identify that uh gateway. So in
972. 40:58case of any uh if in case of any
973. 41:00hardware uh failovers if we just
974. 41:03consider two routers router one and
975. 41:05router two we giving the priority for
976. 41:07the router one. If in case any hardware
977. 41:09failures we will not unexpectedly it
978. 41:11will happen right at that time that PC1
979. 41:13will uh select that another we have
980. 41:16another redent uh router right it will
981. 41:18select that yeah it will select that
982. 41:20gateway. So VRP packets will exchange
983. 41:22through how they will exchange VRP
984. 41:24announcements actually it will announce
985. 41:27uh every second it will announce like
986. 41:29through multiccast there is a multiccast
987. 41:31IP IP yeah IP address 224.0.0.18 0.18 is
988. 41:36the VRP multiccast IP address. So you
989. 41:40said priority right? If I configure
990. 41:41highest priority on one router what will
991. 41:43happen?
992. 41:45Uh that PC will elect that particular
993. 41:47router as the first priority highest
994. 41:50router. What is the state? It is like
995. 41:52what state you will see if a router one
996. 41:54router two is there master. Yeah I think
997. 41:56it will be master. It will elect as
998. 41:58master master. Another one is backup.
999. 42:00You must say that backup. Yeah. That's a
1000. 42:02fantastic. Okay. So in every aspect
1001. 42:06you're fantastic ma I really proud proud
1002. 42:09about you seriously proud of you and uh
1003. 42:13one final interview question they will
1004. 42:15ask you during main right what kind of
1005. 42:18real issues you face so far have you
1006. 42:20worked any issue recently the critical
1007. 42:24issue the P1 or P2 critical issue where
1008. 42:27you have contributed so much and resolve
1009. 42:29that issue do you have such kind of uh
1010. 42:32you know situation during your
1011. 42:33experience
1012. 42:34[Music]
1013. 42:36Yeah. Yes. Uh have that kind of P1 uh
1014. 42:39like we have configured that port first
1015. 42:42uh and uh I mean we configure the post
1016. 42:45portfast and BPDU card. Uh actually for
1017. 42:48that uh connecting the L3 uh it's like
1018. 42:50uh CC cameras for CCK we are we are
1019. 42:54configured that BPDU guard and both
1020. 42:56first at that time that field engineer
1021. 42:58that particular there is a separate
1022. 43:00team. So they're uh uh I mean
1023. 43:02unfortunately they're uh connected that
1024. 43:06plug and play switch like it's uh we
1025. 43:08have a switches two types of switches
1026. 43:09right so there uh unfortunately they
1027. 43:12connected the switch at that time that
1028. 43:14BPD frames is generated so we already uh
1029. 43:16created that BPD card right so it's goes
1030. 43:19to that error disabled state so that a
1031. 43:22protocols are uh stopped so at that time
1032. 43:24we checked uh at the back that the next
1033. 43:27other hand there uh that didn't
1034. 43:29configure any BPDU filter. So if we are
1035. 43:32configured any BPDU filter inside that
1036. 43:35switch uh it will not send and it will
1037. 43:37not receive any BPD filter name. So we
1038. 43:39don't have any issues. So at that time
1039. 43:41what we did like uh we uh we enter that
1040. 43:44port a particular port and whatever you
1041. 43:46created that BPD card right. So we uh
1042. 43:49disable that BPU do BPD that services is
1043. 43:52restored then once that created that
1044. 43:55BPDU filter inside that their side
1045. 43:57switch then again we enable that I mean
1046. 43:59we confident that BPDU uh got inside our
1047. 44:02switch. This is the scenario. Actually,
1048. 44:04this is the team means you you did or
1049. 44:06your team did. Actually, this is the
1050. 44:08teamwork. Uh I'm the one of the part in
1051. 44:11that. Okay. Okay. Got it. Got it. So,
1052. 44:13the thing is how you restore that link.
1053. 44:16It went to error disabled state, right?
1054. 44:18Bones the shut uh shut down and uh
1055. 44:22unshut and shut. Perfect.
1056. 44:26I'm so happy for your interview. Okay.
1057. 44:29So I'm telling you I have taken 10 to 15
1058. 44:32years of experience candidate interview
1059. 44:34recently in my organization. They're not
1060. 44:36good at basics but this is the best best
1061. 44:39best interview with the candidate. The
1062. 44:43only the only suggestion I can give you
1063. 44:45is go slow and use the right keywords.
1064. 44:49You are already using the right keywords
1065. 44:50but just flipping it between them. just
1066. 44:54go slowly and recall the right words and
1067. 44:57uh be cautious what you're saying. Okay,
1068. 45:00now you're so much cautious when I was
1069. 45:02correcting you and yeah all good ma
1070. 45:05fantastic. I really would like to refer
1071. 45:08you in other product based companies.
1072. 45:10Definitely do that right if anyone sees
1073. 45:13this interview right definitely they
1074. 45:15will you know I will right away I'm
1075. 45:17going to put this interview in YouTube
1076. 45:19people who saw this right they can
1077. 45:21seriously you know seriously I'm saying
1078. 45:24the way you answer it everyone should
1079. 45:25learn from you same way okay so if you
1080. 45:29give permission I'll upload it or else
1081. 45:31no but this is really really helpful to
1082. 45:34others you just tell me okay now so how
1083. 45:38can I proceed further Do you need time
1084. 45:40to think? Yes. I I need to think. Yeah.
1085. 45:44And let me know if it is good and if it
1086. 45:47is good to upload then I'll do that or
1087. 45:49else I'll put in internal at least
1088. 45:51private mode if you don't want because
1089. 45:54you know what uh you know what this is
1090. 45:57really really fantastic interview. Okay.
1091. 46:00Thank you. Yeah. And uh all the very
1092. 46:02best and I'll get back to you. Okay.
1093. 46:04With reference. Okay. Thank you ma. Have
1094. 46:06a nice day. See you. Thank you. Okay.
1095. 46:10[Music]