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Assume that source S and destination D are connected through two intermediate routers labeled R. D determine how many times each packet has to visit the network layer and the data link layer during a transmission from S to D. S — R — R — D

1. Network layer - 4 times and Data link layer - 4 times
2. Network layer - 4 times and Data link layer - 3 times
3. Network layer - 4 times and Data link layer - 6 times
4. Network layer - 2 times and Data link layer - 6 times

Correct answer: Network layer - 4 times and Data link layer - 6 times

Solution

Each packet must traverse the network layer at the source and each router, totaling four visits. Additionally, the data link layer is engaged at the source, each router, and the destination, resulting in six visits overall.

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