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Module 3: Network Layer & Routing

20192m

Which one of the following is not a function of network layer?
(i) Routing
(ii) Inter-networking
(iii) Congestion control
(iv) None of the above

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Answer: (iv) None of the above

Why: Routing (choosing the best path), inter-networking (delivering a packet across multiple interconnected networks) and congestion control (regulating traffic so buffers/queues do not overflow) are all recognised functions of the network layer. Since options (i), (ii) and (iii) are each genuine network-layer functions, none of them is a "non-function", making (iv) the correct choice.

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