[E]. (12 points, 2 for each box) Consider the network shown below, consisting of

Question

[E]. (12 points, 2 for each box) Consider the network shown below, consisting of a single router, R1, with three subnets A, B and C, with 16, 29, and 45 hosts respectively on these subnets. Assume the ISP assigned the address block of 201.120.79.0/24 to this network. Now assign an address range to the hosts in subnets A, B, and C such that each address range is minimized. List the address range, prefix for subnets A, B, and C by filling in the following table.

A- 16 hosts - -

-

B- 29 hosts ------ Router R1 (the subnets link to router R1)

---

C- 45 hosts ---

Subnet

Prefixes

Address Range

A

201.120.79.0/____

201.120.79.0      ------ 201.        .        .___   

B

201.        .        .___/ ____

201.        .        .___------ 201.        .        .___

C

201.        .        .___/ ____

201.        .        .___------ 201.        .        .___

Explanation / Answer

a)

since we have 16 hosts we need 18 addresses as one will be default gateway.

subnet will be 201.120.79.0/27 and address which can be used are 201.120.79.0 -- 201.120.79.31

b)

for 29 host again we need 31 so it can be done with 27 subnet.

so i will be 201.120.79.32/27 and address range will be 201.120.79.32--201.120.79.63

c)

for 45 hosts we need 47 addresses so it will be

201.120.79.64/26 and address range will be 201.120.79.64 -- 201.120.79.127

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