Explain how Router1, in the previous example, knows that datagram destined to network 10.0.3.10 should be forwarded 10.0.2.2?
What will be an ideal response?
Router1 will check its routing table, which has the entry that says any packet destined to the network 10.0.3.0 should be sent via 10.0.2.2 (i.e 10.0.3.0 [1/0] via 10.0.2.2), therefore it knows the datagrams should be forward to 10.0.2.2 . Router1 also knows that 10.0.2.2 and PC2 are on the same subnet; therefore it knows that PC2 and 10.0.2.2 are connected directly, and as a result PC2 should use 10.0.2.2 as the gateway, therefore it sent the ICMP redirect message to PC2 to correct the route.
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