GATE CSIT 2005 :
An organization has a class B network and wishes to form subnets for 64 departments. The subnet mask would be:
A) 255.255.0.0
B) 255.255.64.0
C) 255.255.128.0
D) 255.255.252.0
Solution:
|
Class |
Address Range |
Subnet mas |
Example |
Leading bits |
Max number of networks |
|
A |
1 to 126 |
255.0.0.0 |
1.1.1.1 |
8 |
128 |
|
B |
128 to 191 |
255.255.0.0 |
128.1.1.1 |
16 |
16384 |
|
C |
192 to 223 |
255.255.255.0 |
192.1.11. |
24 |
2097157 |
|
D |
224 to 239 |
– |
– |
– |
– |
|
E |
240 to 254 |
– |
– |
– |
– |