Question 2
In the above diagram, the computer with IP address 192.168.1.2 pings the router with IP address 192.168.1.1. Explain how the packet is processed by the router and whether routing is involved in the scenario.
Explanation
The computer constructs the IP header with source IP address as 192.168.1.2 and destination IP address as 192.168.1.3. The IP header would be encapsulated in an ethernet frame with source mac-address as that of the computer’ s mac-address and destination mac-address as the router’ s mac-address. When the frame reaches the router, the router looks into the destination mac-address of the frame. On a match, the FCS value of the frame is calculated and verified. The router then looks into the destination IP address of the IP header. Since the IP address is intended for itself, the router prepares a response. There is no routing involved since the destination IP address is on the same physical segment.
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