Question

Difference between classful addressing and classless addressing

Answer 1

Answer:

Classless IP addressing means you can use any subnetmask you want, even assigning partial blocks. For example subnet 172.16.0.0 is a class B network. But you have two physical interfaces on your router that connect to switches with 5 VLANs.

Classful network is a network addressing architecture used in the Internet from 1981 until the introduction of Classless Inter-Domain Routing in 1993. The method divides the IP address space for Internet Protocol version 4 (IPv4) into five address classes based on the leading four address bits.

Answer 2

Answer:

Classful addressing it divides IP address into network ID and host ID

for example Class A :- has first octet as network ID and last three octet as Host ID

Class B :- has first two as network ID and last three two as Host ID

Class C :- has first three as network ID and last octet as Host ID

2) Here class A,B and C are used where as class D is used for multicasting and class