Basic knowledge of the distance vector routing protocol RIP version 2

Because RIP is a distance vector routing protocol, it will NOT have any ideas about the current network topology.  It will learn routes directly from the update sent by its neighbors.

There are some importance facts about the RIP version 2:

1. RIPv2 is using UDP port 520 to transmit its request & response message.

2. On the broadcast network, RIPv2 uses the multicast address 224.0.0.9

3. Distance vector routing likely got the loop problem named "Counting to infinity".

4. There are two loop-prevent mechanisms for RIPv2: Split-Horizon and Poison-Reverse.

5. Update are sent every 30s, but we can use the trigger update.