subnetting is simple — Transcript

Full transcript

1. 0:00hello and this is sunny welcome back
2. 0:04today my topic is subnetting a subnet is
3. 0:09a logical subdivision of IP network the
4. 0:13process of dividing a network into two
5. 0:17or more networks is called subnetting
6. 0:21the main purpose of subnetting is to
7. 0:24help relieve a network congestion and
8. 0:28improve network performance security is
9. 0:32another benefit of a subnet iam besides
10. 0:36your network a professor may test you
11. 0:40about subnetting Kampuchea national
12. 0:44network plaza certification also expects
13. 0:48you to know how to subnet however some
14. 0:52textbooks make subnetting is very
15. 0:56complicated and confusing in this video
16. 1:00I will use a very simple way
17. 1:03sunny way of subnetting and after this
18. 1:06video you will find subnetting is not a
19. 1:10difficult at all however in order to
20. 1:14understand subnetting we do need some
21. 1:17basic knowledge such as sadness mosque
22. 1:21network ID host ID and a broadcast ID i
23. 1:26put several videos links below just in
24. 1:30case you needed them one more point this
25. 1:35video is much longer than most of my
26. 1:38other videos so please bear with me
27. 1:43[Music]
28. 1:47let's take a look at my example one day
29. 1:51your supervisor walks to you seeing
30. 1:54here's a network ID place it create
31. 1:58three separate networks or subnets for
32. 2:02coffee shop sunny cafe why is for the
33. 2:08office why is for the front desk and
34. 2:13storage room and one is for the public
35. 2:16use your task is to list each service
36. 2:22network ID subnet mask host ideal range
37. 2:27the number of will useful host IDs and
38. 2:32broadcast ID I put this example below
39. 2:37this video so you can copy to your
40. 2:41document for your reference as we
41. 2:43discuss the process of subnetting first
42. 2:49is first let's build a table this table
43. 2:54is the most critical because once we
44. 2:58build it we can easily solve most
45. 3:02subnetting questions and this table has
46. 3:06a three rows the first row is a subnet
47. 3:10with nine numbers we start with 1 then 2
48. 3:174 8 16 32 64 128 and 256 the pattern is
49. 3:28each number is a double of is previous
50. 3:32number okay
51. 3:34the second row is a host this row tells
52. 3:40the number were total host IDs for each
53. 3:43new subnet start with 256 then 128 64 32
54. 3:5316 8 4 2 and
55. 3:58one the pattern is each number is half
56. 4:02of his previous number or the second row
57. 4:07is the reverse order of the first row
58. 4:10you see everyone can handle this right
59. 4:14the third row is a subnet mask we use
60. 4:17shorthand format starting with 24 25 26
61. 4:2427 28 29 30 31 32 well we are done I
62. 4:34call this table sunny subnetting table
63. 4:38or simply sunny table because is a
64. 4:42simple sunny but a powerful table for
65. 4:46subnetting and a subnetting subnet now
66. 4:51we use a sonnet able to solve the
67. 4:54subnetting example mission about let's
68. 4:59go back to the question you are giving a
69. 5:03network ID 100 mm 168 4.0 / 24/24 somnus
70. 5:12mosque you are required to get three
71. 5:15subnets three is the key keyword now
72. 5:20look at the sunny table and it try to
73. 5:24find the three subnets in the first or
74. 5:28in the top row of course there is no
75. 5:33exactly 3 semanas
76. 5:35but for subnets are suitable because we
77. 5:39can get 4 subnets and choose any three
78. 5:43subnets for sunny cafe so we choose a
79. 5:47full subnets for let me circle the whole
80. 5:51column ignoring all other columns
81. 5:56because we only use this three numbers
82. 6:00and we can get all our answers just from
83. 6:05this column or these three numbers for
84. 6:11eighty-four and a slash 26:4 means four
85. 6:17subnets sixty-four means each subnet
86. 6:22each new subnet we are how was 64 total
87. 6:27host ideas including network ID and a
88. 6:32broadcast ID / 26 is the new subnet mask
89. 6:37for all these four subnets
90. 6:42[Music]
91. 6:45well let's list all these four subnets
92. 6:49information a network ID subnet mask
93. 6:54host ID wrench the number we'll use for
94. 6:58host IDs and broadcast ID let's find the
95. 7:04first network ID the first network ID is
96. 7:09always the original network ID which is
97. 7:131 and E 2 tau 168 are 4.0 that's easy
98. 7:19right
99. 7:20I use read found to emphasize the last
100. 7:25number because the first three numbers
101. 7:28stay the same across the table so place
102. 7:32just a focus on last number in red we
103. 7:37will get next network ID by simply
104. 7:41adding 64 to is previous network ID
105. 7:47therefore the second network ID is 0
106. 7:52plus 64 which is a 64 the third network
107. 7:57ID would be 64 + 64 which is 128 the
108. 8:03fourth network ID is 128 plus 64 which
109. 8:10is 192
110. 8:12now subnet mask for each subnet well
111. 8:20they are all / 26
112. 8:24the original subnet mask is slash 24 we
113. 8:28are done with a sub s mask column
114. 8:31now let's list the number of a usable
115. 8:35host IDs and we can also find an answer
116. 8:39from the sunny table which is 64 64 is
117. 8:44the total number of a host IDs for each
118. 8:48Network or each subnet but the first
119. 8:54host ID is reserved for network ID and
120. 8:59alas the host ID is reserved for
121. 9:02broadcast ID thus the number of useable
122. 9:06host ID is 64 minus 2 which is a 62 thus
123. 9:13we write down 62 for all 4 subnets we
124. 9:20are done with the fourth column now
125. 9:25let's look at at the broadcast ID for
126. 9:28each subnet keep in mind the last host
127. 9:32ID is reserved for his broadcast ID
128. 9:36therefore broadcast ID for the first
129. 9:40subnet is 63 and we can tell with the
130. 9:47reference to the next network ID 64 next
131. 9:53broadcast ID is 127
132. 9:59next one is 191
133. 10:04and that the last broadcast ID is 255 we
134. 10:10can say the broadcast ID equals next
135. 10:14subnet networks ID minus 1 we can also
136. 10:19do like this once you know the first
137. 10:22broadcast the ID 63 and then you can
138. 10:25simply add 64 to get the second
139. 10:29broadcast ID and the 63 plus 64 is 1 2
140. 10:34new semi and if they add 64 2 1 2 new
141. 10:38semi which we get the third brother Casa
142. 10:41ID 1 91 and then they increase by 64
143. 10:46again to get the fourth broadcast the ID
144. 10:49which is 255 we are almost done
145. 10:54one last column the host ID arrange a
146. 11:00subnet host ID range is is any IDs
147. 11:05between his network ID and a broadcast
148. 11:10ID for the first subnet 1 262 is between
149. 11:16network ID 0 and broadcast ID 63 the
150. 11:22second host an ideal range 65 to 126 is
151. 11:29between 64 and 127th the third host ID
152. 11:35range 129 to 190 is between 128 and 191
153. 11:43the fourth host ID range is between 192
154. 11:49and a 255 which is 193 to 254 so to keep
155. 11:56simple we only talked about it last a
156. 11:58number and because the first of three
157. 12:01numbers stay the same
158. 12:03that's all we get all answers you can
159. 12:11assign any 3 out of 4 subnets for sunny
160. 12:15cafe 1 subnet
161. 12:18is wasted of course that's the downsides
162. 12:21of subnetting no biggie I want to thank
163. 12:25you for following me at this point you
164. 12:28are a very patient person for listening
165. 12:31to me with my strong English accent even
166. 12:38though the process sounds a tedious but
167. 12:43once you get to know how to do it you
168. 12:46can solve any similar questions in no
169. 12:50time I put a 1 similar question below
170. 12:54for your practice I also provided the
171. 12:57answer below for your reference if you
172. 13:01have a questions please feel free to
173. 13:03leave your comments or ask me questions
174. 13:06I would be happy to help you in next
175. 13:09video I will go one step further
176. 13:13subnetting a subnet using the same sunny
177. 13:17table in same sunny way please stay
178. 13:23tuned thank you very much and see you
179. 13:26next time
180. 13:29[Music]