What is RIPv1? RIPv2?

RIP: RIP v1 uses what is known classful routing. Classful addressing is the use of Class A, Class B, and Class C addresses. (Class D is reserved for multicasts, and Class E is reserved for future use.) Class A, B, and C addresses define a set number of binary bits for the subnet portion. For example, a Class A network ranges from 1–127 and uses a subnet mask of 255.0.0.0. A Class B network uses the mask 255.255.0.0, and Class C uses 255.255.255.0. RIP v1 does not support authentication of update messages (plain-text or MD5). RIP v1 is an older, no longer much used routing protocol.

RIP v2 is a classless protocol and it supports classful, variable-length subnet masking (VLSM), CIDR, and route summarization. RIPv2 supports authentication of RIPv2 update messages (MD5 or plain-text). Authentication helps in confirming that the updates are coming from authorized sources. It also supports multicast routing updates to reduce resource consumption (as opposed to using broadcasting in RIP v1). RIP v2 can be useful in small, flat networks or at the edge of larger networks because of its simplicity in configuration and usage.

Hi Mohamed619,
1. RIPv1 is a classful routing protocol, and RIPv2 is a classless routing protocol.
2. RIPv1 does not support VLSM, and RIPv2 supports VLSM.
3. The RIPv1 does not provide the authentication function. The RIPv2 supports authentication and has two authentication modes: Plain text and MD5.
4. The RIPv1 does not provide the function of manually summarizing data. The RIPv2 can manually summarize the data when the automatic summarization function is disabled.
5. RIPv1 is a broadcast update, and RIPv2 is a multicast update.
6. The RIPv1 does not mark the route. The RIPv2 can mark the route (tag) for filtering and making policies.
7. A maximum of 25 routers can be carried in the update sent by theRIPv1, and a maximum of 24 routers can be carried when the RIPv2 is authenticated.
8. The update packet sent by the RIPv1 does not contain the next-hop attribute, and the RIPv2 has the next-hop attribute.
I hope it helps!