Briefly explain the difference between classful addressing and classless addressing in ipv4
Answers
Classful Addressing:-
1) In 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 D for research
3) Disadvantage is that it limit the number of network that can be provided to the network
4) Example RIP(Routing Information Protocol) protocol uses classful addressing
5) Class A :\8 as (1 octet is network ID) , Class B :-\16 , Class C : \24
6) Same Subnet mask is used in complete network
Classless Addressing :-
1) It allows us to use variable length subnet mask so also known as VLSM (Variable Length Subnet Mask)
2) Different subnet mask used in same network.
3) In this there is no boundary on host id and network id
4) Classless Addressing also known as CIDR(classless interdomain routing)
5) There is no default subnet mask in classless routing.
6) Example: BGP(Border Gateway Protocol),RIPv2
Hope it helps you buddy!
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