The network administrator needs to address seven LANs.

The network administrator needs to address seven LANs. RIP version 1 is the only routing protocol in use on the network and subnet-zero is not being used. What is the maximum number of usable IP addresses that can be supported on each LAN if the organization is using one class C address block?

A. 6
B. 8
C. 14
D. 16
E. 30
F. 32

Answer : E

Explaination:

We need 7 LANs also subnet-zero (1st subnet must be not be included). So we need 7 subnets, then the appropriate mask will be 255.255.255.224.

For example: assume that our IP address will be on 192.168.100.0 network. Then the subnet would be

  1. 192.168.100.0
  2. 192.168.100.32
  3. 192.168.100.64
  4. 192.168.100.96
  5. 192.168.100.128
  6. 192.168.100.160
  7. 192.168.100.192
  8. 192.168.100.224

For each subnet it will have 30 usable ip addresses.

Refer to the question, the below is the topology of the network 7 network

5

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