Classfull Addressing | Classless Addressing |
|---|---|
| Address space is divided into five classes: Class A, Class B, Class C, Class D, and Class E | No concept of classes |
| All devices in the same routing domain must use the same subnet mask | It allows the use of variable length subnet masks |
| It uses IP addresses of the same network class in all its sub-networks | It enable the use of IP addresses with different subnet masks in the same network |
| IP address is divided into two parts: Host Id and Network Id | No boundary on Host Id and Network Id |
| It uses only the FULL mask for its class (A, B, C) | It uses a CUSTOM mask (subnet mask) obtained by adding EXTRA bits |
| IP forwarding process is restricted | IP forwarding process has no restrictions |
| Routing Information Protocol (RIP) protocol uses classful addressing | Border Gateway Protocol,RIPv2 uses classless addressing |