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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?
Routers can be considered layer 3 devices because they provide their main function (routing) based on layer 3 information.
But a routing protocol, like RIP, is actually an application that the router uses to communicate with other routers. It uses IP/UDP as its transport. It could be considered to be at the application layer.
The usual caveats about theoretical models vs real-world implementations apply.
