SubnettingSubnetting

Class A Address

0-127 O is the subnet Identifier 127 is the loop back address. Each class A address supports 16,387,064

hosts. Assigned to large corporation example 95.27.27.1

Class B

128-191 128 is the subnet identifier. 191 is used for broadcasting. Each class B address supports 64.516 Assigned to medium networks example: 156.184.3.2

Class C

192-223 192 is the subnet identifier. 223 is used for broadcasting Each class C address supports 254 hosts Assigned for small networks.

Class E & D

Class D – 224-239– Used for multicasting.

Class E – 240-255– Used for Experimentation.

Subnetting

Why: to break a network into smaller and more manageable subnets.

How: by borrowing bits from the host section. Problems:

– Routers are not aware of subnetting plans. (Can be solved)

– Loss of IP addresses. (Solution under development)

Subnet Mask

Used to filter and identify the network address and the sub network address.

How: – Special Format; All the pits in network and sub

network area will be turned on.(Continuous string of binary 1 digits)

– Binary And the Subnet mask and the IP address. (Only 1 + 1 =1)

A Binary And Operation

Default Gateway

The sub network Connection to the local router.