@Muhammad Mujtaba wrote:
when we connect 2 PC's with router in packet tracer and we are not using any routing protocol.But the router needs routing protocols to communicate between/across the network.and we are not using any protocol in connection of PC's with router in packet tracer.
I want just little description of this question.
Routing protocols (or static routes) are needed between routers, in order for those routers to learn about networks which are remote and therefore 'unknown'.
For example, you have a router 'A' connected via a link to router 'B'.
A has a network 192.168.1.0 directly connected i.e. has an interface address which is part of network 192.168.1.0. It also has another interface, which connects it directly to B. Its routing table therefore has the following known networks;
Network 192.168.1.0[directly connected]
Network 10.0.0.0/30 [directly connected]
Router B has an interface address which is part of network 192.168.2.0. It also has another interface, which connects it directly to A.
Its routing table therefore has the following known networks;
Network 192.168.2.0[directly connected]
Network 10.0.0.0/30 [directly connected]
In order for A to know that, to get to network 192.168.2.0 it has to go through B, and vice versa, B has to 'advertise' that network 192.168.2.0 resides inside it, and the way to that network is via its interface directly connected to A. A does the same for network 192.168.1.0, and its routing table now looks something like this;
Network 192.168.1.0[directly connected]
Network 10.0.0.0/30 [directly connected]
Network 192.168.2.0 via the directly connected interface of router B.
When you connect two PCs to one router in packet tracer routing protocol is not needed, since the router already knows that both PCs are attached to its directly connected interface.
Hope this kind of makes it a little less confusing.
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