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    Question

    Which of the following protocol is used for discovering

    link layer address or MAC address, associated with a given internet layer address?
    A Hypertext Transfer Protocol Correct Answer Incorrect Answer
    B Address Resolution Protocol Correct Answer Incorrect Answer
    C File Transfer Protocol Correct Answer Incorrect Answer
    D Resource Reservation Protocol Correct Answer Incorrect Answer

    Solution

    Why this is correct:
    ARP resolves an IPv4 address (network-layer) to its corresponding MAC address (link-layer) on a local network. When a host wants to send an IP packet on Ethernet, it uses ARP to find the destination MAC. Why the others are wrong:

    • 1 (HTTP): Application-layer web protocol.
    • 3 (FTP): Application-layer file transfer protocol.
    • 4 (RSVP): Resource Reservation Protocol тАФ used for reserving resources for QoS, not address resolution.

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