The network administrator needs to address seven LANs. RIP version 1 is the only routing
protocol in use on the network and subnet 0 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.
8
B.
6
C.
30
D.
32
E.
14
F.
16
Explanation:
Since there is one class C network that means 256 total IP addresses. Since we need 7 LAN
blocks and we can not use the first one (subnet 0) we take 256/8=32 hosts. However, since
we need to reserve the network and broadcast addresses for each of these subnets, only 30
total IP addresses are usable.