# COMPUTER NETWORKING

## NETWORK LAYER

### INTRODUCTION

 Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
An organization has a class B network and wishes to form subnets for 64 departments. The subnet mask would be:
 A 255.255.0.0 B 255.255.64.0 C 255.255.128.0 D 255.255.252.0
Explanation:

Detailed explanation-1: -We can use the formula 2^n-2 = H, where H is the number of hosts per subnet. We need at least 7 host bits to allow for 100 hosts per subnet. Therefore, the subnet mask that will allow for 64 subnets and at least 100 hosts per subnet is 255.255. 252.0, which has 6 subnet bits and 10 host bits.

Detailed explanation-2: -Example: A class C network would have a subnet mask of 255.255. 255.0 which means that 24 bits are used for the network. In CIDR notation this is designated by a /24 following the IP address.

Detailed explanation-3: -The ‘maximum number of host class b network’ on the ‘internet’ has a ‘subnet mask of 255.255. 248.0 is 2046’

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