Assume that source S and destination D are connected through five intermediate…
2017
Assume that source S and destination D are connected through five intermediate routers R1, R2, R3, R4 and R5. Determine how many times each packet has to visit the Network layer and the Data Link layer during transmission from S to D?
- A.
Network Layer: 7 times, Data Link Layer: 12 times
- B.
Network Layer: 5 times, Data Link Layer: 12 times
- C.
Network Layer: 12 times, Data Link Layer: 12 times
- D.
Network Layer: 7 times, Data Link Layer: 7 times
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Correct answer: A
The packet visits the Network layer 7 times (1 at source, 1 at destination, and 1 at each of the 5 intermediate routers). It visits the Data Link layer 12 times (1 at source, 1 at destination, and 2 times—inbound and outbound—at each router). Thus, Option A is correct.