The Address Resolution Protocol (ARP) is used to resolve an IP address into a MAC address. When a device sends an ARP request asking “Who has IP X.X.X.X?”, it expects a MAC address in response.
A.✘VLAN ID – Not involved in ARP
B.✘IP address – The IP is already known; MAC is being queried
C.✔MAC Address – The required Layer 2 address is returned
D.✘802.11g – Wireless standard, irrelevant to ARP
Extract from MTCNA Course Material – ARP Basics:
“ARP maps IP addresses to MAC addresses. The reply to an ARP request contains the MAC address of the queried IP.”
Extract from René Meneses Study Guide – Layer 2/3 Functions:
“ARP is a Layer 2 protocol that returns a MAC address for a known IP.”
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