I'm studying networking from the book 'A top down approach' from Kurose and Ross.
In the book it is stated that routers are generally considered Layer 3 devices (i.e. implementing the stack up to the network layer).
RIP, a intra AS routing algorithm, should be a network layer component and yet it uses UDP as a mechanism for messages exchange.
Is this a violation of the general rule of isolation?Or am I getting something wrong?