Question

In: Computer Science

4) An organization where you are assigned as a network admin is granted a block of...

4) An organization where you are assigned as a network admin is granted a block of addresses with the beginning address 14.24.74.0/24. The organization needs to have 3 subblocks of addresses to use in its three subnets as shown below. Create address subblocks for these 3 subnets based on the given address block. ❑ subnet 1: One subblock of 120 addresses. ❑ subnet 2: One subblock of 60 addresses. ❑ subnet 3: One subblock of 10 addresses

Expert Solution

Consider, company A needs-->120 addresses.

Company B needs 60 addresses.

Company C needs 10 addresses.

Given network address is 14.24.74.0/24. Which means above network has 24 bits as network bits and 8 bits as host bits. So 14.24.74.0 is a network ID which have hosts that is 256 hosts.

We are asked to use classless inter-domain routing for subnetting(CIDR). CIDR has property that it can divide a network into unequal parts or subnetworks.

Important thumbrule of subnetting is that number of hosts of a subnetwork must be in powers of 2.

Now company A needs 120 hosts. So nearby power of 2 which satisfy above requirement is 128 hosts i.e. hosts. Host bits =7, Network bits =32-7=25.

Required subnetwork ID for company A is 14.24.74.0/25

Which contain 126 hosts one net ID and one Direct Broadcast Address(DBA). Range of addresses lies between 14.24.74.0/25 to 14.24.74.127/25.

Company B needs 60 addresses. Nearest power of 2 which satisfy this need is i.e. 64 hosts.

6 host bits and 32-6=26 network bits.

So range of subnetwork of company B lies from 14.24.74.128/26 to 14.24.74.191/26. With subnetwork ID as 14.24.74.128/26 and direct broadcast address (DBA) is 14.24.74.191/26.

Similarly, company C needs 10 hosts nearest power of 2 which satisfy above requirement is that is 16 hosts. So host bits=4, network bits=32-4=28.

Range of subnetwork for company C is 14.24.74.192/28 to 14.24.74.207/28 with subnetwork ID as 14.24.74.192/28 and DBA as 14.24.74.207/28.

So overall company A has subnet ID 14.24.74.0/25

Company B has subnet ID 14.24.74.128/26.

Company C has subnet ID 14.24.74.192/28.

venereology answered 2 years ago

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