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Which protocol is responsible for learning an IPv4 neighbor's MAC address?
Correct Answer: A
The Address Resolution Protocol (ARP) is responsible for mapping an IPv4 address to a machine's MAC address. ARP operates at Layer 2 of the OSI model and is used to find the MAC address of a host given its IPv4 address. When a device wants to communicate with another device on the same local network, it uses ARP to discover the recipient's MAC address. Reference: Juniper official documentation: ARP. Networking standards: RFC 826.