Practice Example #4C: 255.255.255.240 (/28)
Written on 15:41 by Ahmet Emir
Let’s convenance on addition one:
192.168.10.0 = Network address
255.255.255.240 = Subnet mask
- Subnets? 240 is 11110000 in binary. 24 = 16.
- Hosts? 4 host bits, or 24 – 2 = 14.
- Accurate subnets? 256 – 240 = 16. Start at 0: 0 + 16 = 16. 16 + 16 = 32. 32 + 16 = 48. 48 + 16 =
64. 64 + 16 = 80. 80 + 16 = 96. 96 + 16 = 112. 112 + 16 = 128. 128 + 16 = 144. 144 +
16 = 160. 160 + 16 = 176. 176 + 16 = 192. 192 + 16 = 208. 208 + 16 = 224. 224 + 16 = 240.
- Advertisement abode for anniversary subnet?
- Accurate hosts?
To acknowledgment the aftermost two questions, analysis out the afterward table. It gives you the subnets,
valid hosts, and advertisement addresses for anniversary subnet. First, acquisition the abode of anniversary subnet
using the block admeasurement (increment). Second, acquisition the advertisement abode of anniversary subnet increment
(it’s consistently the cardinal appropriate afore the abutting accurate subnet), again aloof ample in the host addresses.
The afterward table shows the accessible subnets, hosts, and advertisement addresses provided
from a Class C 255.255.255.240 mask:
Subnet 0 16 32 48 64 80 96 112 128 144 160 176 192 208 224 240
First host 1 17 33 49 65 81 97 113 129 145 161 177 193 209 225 241
Last host 14 30 46 62 78 94 110 126 142 158 174 190 206 222 238 254
Broadcast 15 31 47 63 79 95 111 127 143 159 175 191 207 223 239 255
Cisco has ample out that best bodies cannot calculation in 16s and accordingly have
a adamantine time award accurate subnets, hosts, and advertisement addresses with the
Class C 255.255.255.240 mask. You’d be astute to abstraction this mask.
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