ITPEC FE Subject A October 2025 Question 24
ITPEC FE Subject A October 2025 — Question 24 of 60
ARP Request Destination — ARP request is always sent to the broadcast MAC address.
PC5 needs to find PC4's MAC address but doesn't know it yet, so it sends an ARP request.
- •ARP request = broadcast → destination MAC is
FF:FF:FF:FF:FF:FF - •ARP reply = unicast → sent directly back to the requester's MAC
Why not others:
- (a) 00:00:00:00:00:00 — not a valid broadcast destination
- (b) 78:E1:00:3C:A1:8B — this is PC4's MAC, but PC5 doesn't know it yet (that's the whole point of ARP)
- (c) 78:E1:00:3C:A1:9F — this is PC5's own MAC address
Key rule: ARP request → broadcast (FF:FF:FF:FF:FF:FF); ARP reply → unicast.
AI-generated — may contain errors
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