\\ ACME Corp has offices in Toledo, Detroit and Columbus. Each office has 128 co

Question

ACME Corp has offices in Toledo, Detroit and Columbus. Each office has 128 computers. The IT

plan calls for connecting all offices using T-1 data lines. The Toledo site will also connect to the

Internet. ACME Corp. has elected to use public IP address space on all computers at each of its

sites.

a) Their ISP has restricted the IP ranges to the ones below. The ISP’s Network Administrator

is on vacation – you have been asked to fill-in and select a range of addresses that will

satisfy ACME Corp.’s needs with the least amount of wasted IP addresses. Propose a single

range of addresses (using CIDR notation) for ACME Corp. and explain your answer.

225.113.8.0/24

225.113.9.0/24

192.168.0.0/16

221.127.136.0/24

221.128.135.0/24

221.128.136.0/24

221.128.137.0/24

221.128.138.0/24

206.122.148.0/24

10.0.0.0/8

221.125.138.0/24

221.126.137.0/25

221.128.139.0/24

b) Propose subnets for each of ACME Corp.’s offices using CIDR notation

Explanation / Answer

a)

Based on the ranges given the best range for the ace corp will be to use

221.128.135.0/24

221.128.136.0/24

221.128.137.0/24

221.128.138.0/24

For each of the above IP addresses we have subnet mask value as 255.255.255.0 which means that it can accomodate 256 addresses. Now each site should have a separate broadcast address which can be used by separate sites.

So in total they can accomodate all these people in this subnet. The starting address will be 221.128.135.0 for the corporation.

b)

In CIDR notation it will be 221.128.135.0/22

Some of the IPs will not be used but this can be kept for future exapansion purpose. Overall with this scheme acme corp can provide 1024 addresses.

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