Answer to Question #197157 in Computer Networks for Mohammad Shafi

Question

As a Network Strategies Subject student deal with the following subnet requirements
Company XYZ has five Branches including with Head Quarter. The number of required IP Addresses
is the following.
a. Head Quarter require 2000 IP Addresses.
b. Branch A require 800 IP Address. .
c. Branch B require 300 IP Address.
d. Branch C require 200.
e. Branch D require 120.
Define the appropriate Subnet for

Answer 1

The starting IP address of the class B is 128.0.0.0 to 191.255.255.255

Hence, we can say that in our case IP address will start from 128.0.0.0

Headquarter required 2000 addresses, so the nearest size is $2^{11}=2048$

So, IP of headquarter starts from 128.0.0 to 128.0.7. 255, here 48 address will be unused.

Branch A required 800 addresses, so nearest block size $=2^{10}=1024$

Starting IP of branch A 128.0.8.0 to 128.0.11.255, for this unused address 224

Branch B required 300 address it means nearest size $2^{9}=512$

Starting IP of branch B 128.0.12.0 to 128.0.13.255, for this unused address 212

Branch C required 200 address it means nearest size $2^{8}=256$

Starting IP of branch B 128.0.14.0 to 128.0.14.255, for this unused address 56

Branch C required 120 address it means nearest size $2^{7}=128$

Starting IP of branch B 128.0.15.0 to 128.0.15.127, for this unused address 8