GATE CS 2021 Set 1 — Question 18
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Computer Networks → Network Layer: Addressing → ARP & RARP
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Question
Consider the following two statements.
: Destination MAC address of an ARP reply is a broadcast address.
: Destination MAC address of an ARP request is a broadcast address.Which one of the following choices is correct?
: Destination MAC address of an ARP reply is a broadcast address.
: Destination MAC address of an ARP request is a broadcast address.Which one of the following choices is correct?
Correct answer
(C) S₁ is false and S₂ is true.
Solution
: An ARP reply is a unicast message sent directly to the requester. Its destination MAC address is the specific MAC address of the host that sent the ARP request. Therefore, is false.
: An ARP request is a broadcast message because the requester does not know which host has the target IP address. Its destination MAC address is the broadcast address (FF:FF:FF:FF:FF:FF). Therefore, is true.
: An ARP request is a broadcast message because the requester does not know which host has the target IP address. Its destination MAC address is the broadcast address (FF:FF:FF:FF:FF:FF). Therefore, is true.
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