UGC NET CS 2011 June-Paper-2
October 3, 2023JNU PhD CS 2019
October 3, 2023JNU PhD CS 2019
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Question 3
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If two communicating stations X and Y are linked through two intermediate routers, r1 and r2; then determine the number of times each packet visits Network Layer (NL) and Data Link Layer (DLL) for single transmission from X to Y.
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NL – 4, DLL – 4
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NL – 4, DLL – 3
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NL – 4, DLL – 6
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NL – 2, DLL – 6
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Question 3 Explanation:
Each router will contain two DLL since it has two interfaces and one network layer. Each host or station will contain one network layer and one data link layer. So the total no. of data link layer will be 2(from stations) + 4(from routers) = 6. No. of network layers will be 2(from stations) + 2(from routers) = 4.
Correct Answer: C
Question 3 Explanation:
Each router will contain two DLL since it has two interfaces and one network layer. Each host or station will contain one network layer and one data link layer. So the total no. of data link layer will be 2(from stations) + 4(from routers) = 6. No. of network layers will be 2(from stations) + 2(from routers) = 4.
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