The Routing Information Protocol (RIP) is one of the oldest distance-vector routing protocols which employ the hop count
as a routing metric. RIP prevents routing loops by implementing a limit on the number of hops allowed in a path from source to destination.
It is characterized as an interior gateway protocol, and is typically used in small to medium-sized networks. Max hop count is 15. AD value of RIP is 120.
RIP has a 2 Version,
|RIP Version 1||RIP Version 2|
|Classfull routing protocol||By default Classfull but supports classless also|
|Broadcasts Update on 255.255.255.255||Multicasts update on 220.127.116.11|
|Doesnot support authentication||Supports authentication|
It is the method of preventing routing loops in Distence Vector routing protocol by restricting the router to advertise back onto a interface
from which it was received.
NOTE: Hopcount indicates that how far any advertised information can travel or multicasts within network or the life time of Packets. As sender sends packet with max hopcount value and within each hop it decreases everytime by 1.
If router does not have info about particular network ans it is sending metrix value of 16, then that process is called Route Poisioning i.e Router send update
with metrix value 16.