Problem Organization A has been assigned a Network address 2

Problem

Organization “A” has been assigned a Network address: 200.32.5.0

Part a.

In conventional class-full sense, what class is this address?

Part b.

What mask will this organization have to use when it transitions to new CIDR addressing scheme?

Part c.

Let us say that the organization wants to create multiple subnets but each subnet is small. How many subnets, each containing no more than 62 hosts, can this organization create?

Part d.

Recommend a strategy where each subnet does not have more than 62 hosts attached. Be specific about the number of routers this organization needs, the number of interfaces each router needs, and the IP addresses assigned to each interface of the routers. Assume only one interface to the outside internet (called Wide Area Network (WAN) port).

Solution

a)

200.32.5.0 has 110 leading bits. Hence, it is class C.

b) Since the address is of the form a.b.c.0, the mask is 255.255.255.0. Hence, 200.32.5.0/24 (where 24 is the number of bits out of total 32 bits)

c) According to RFC 1812, This organization has the capacity to have 4 subnets of 64 hosts out of which 2 are not usable since host addresses of all 0s and 1s are not usable.

Therefore, that leaves 4 subnets of size 62 each with 4 IPs spare since a total of 254 IPs.

d) Connect a single router with a switch that connects with 4 other routers. Hence, a total of 5 routers.

1st router (connected to the WAN): 200.32.5.0

2nd router\'s interface: 200.32.5.1

3rd router\'s interface: 200.32.5.63

4th router\'s interface: 200.32.5.125

5th router\'s interface: 200.32.5.187