Match List I with List II. List I: A. Data link layer, B. Network layer, C. Transport layer, D. Session layer. List II: I. True end-to-end layer, II. Token management, III. Produce billing information, IV. Piggybacking.

1. AA ‐ IV, B ‐ III, C ‐ I, D ‐ II
2. BA ‐ IV, B ‐ II, C ‐ I, D ‐ III
3. CA ‐ II, B ‐ III, C ‐ I, D ‐ IV
4. DA ‐ IV, B ‐ I, C ‐ III, D ‐ II

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Correct answer: A. A ‐ IV, B ‐ III, C ‐ I, D ‐ II

Explanation

Piggybacking ACKs is a data-link technique; the network layer can count packets for billing; the transport layer is the true end-to-end layer; the session layer manages tokens.