Assume that Source S and Destination D are connected through an intermediate…
2017
Assume that Source S and Destination D are connected through an intermediate router R. How many times a packet has to visit the network layer and data link layer during a transmission from S to D?
- A.
Network layer – 4 times, Data link layer – 4 times
- B.
Network layer – 4 times, Data link layer – 6 times
- C.
Network layer – 2 times, Data link layer – 4 times
- D.
Network layer – 3 times, Data link layer – 4 times
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Correct answer: D
The transmission path involves Source S, Router R, and Destination D.
At the Network Layer, the packet is processed at the Source during encapsulation (1), at the Router for routing decisions (2), and at the Destination for delivery (3), totaling 3 visits.
At the Data Link Layer, frames are handled at Source transmission (1), Router reception (2), Router re-transmission (3), and Destination reception (4), totaling 4 visits.