154
Chapter 3
Internet Protocols
To answer questions 4 and 5, check out the following table. It gives you the
subnets, valid hosts, and broadcast addresses for each subnet. First, find the
broadcast address of each subnet (it's always the number right before the next
valid subnet), then just fill in the host addresses.
Practice Example #4C: 255.255.255.248 (/29)
Let's keep practicing:
192.168.10.0
= Network address
255.255.255.248
= Subnet mask
Subnets? 248 in binary
= 11111000. 2
5
- 2 = 30.
Hosts? 2
3
- 2 = 6.
Valid subnets? 256
- 248 = 8, 16, 24, 32, 40, 48, 56, 64, 72, 80, 88,
96, 104, 112, 120, 128, 136, 144, 152, 160, 168, 176, 184, 192, 200,
208, 216, 224, 232, and 240.
Broadcast address for each subnet?
Valid hosts?
Okay, take a look at the following table... it shows some of the subnets
(first three and last three only), valid hosts, and broadcast addresses for the
Class C 255.255.255.248 mask.
Practice Example #5C: 255.255.255.252 (/30)
Just a couple more:
192.168.10.0
= Network address
255.255.255.252
= Subnet mask
Subnet
16 32 48 64 80 96
112
128
144
160
176
192
208
224
First host
17 33 49 65 81 97
113
129
145
161
177
193
209
225
Last host
30 46 62 78 94 110
126
142
158
174
190
206
222
238
Broadcast
31 47 63 79 95 111
127
143
159
175
191
207
223
239
Subnet
8
16
24
...
224
232
240
First host
9
17
25
...
225
233
241
Last host
14
22
30
...
230
238
246
Broadcast
15
23
31
...
231
239
247
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