Which protocol is used to resolve a known IP address to an unknown MAC address?

A.
ICMP

B.
RARP

C.
ARP

D.
TFTP

Explanation:
The Address Resolution Protocol (ARP) sends a broadcast asking for the host with a specified IP
address to reply with its MAC, or hardware address. This information is kept in the ARP Cache. * the
Reverse Address Resolution Protocol (RARP) is commonly used on diskless machines, when the MAC
is known, but not the IP address. It asks a RARP server to provide a valid IP address, which is
somewhat the reverse of ARP. * the Internet Control Message Protocol (ICMP) is a management
protocol for IP. * the Trivial File Transfer Protocol (TFTP), is a stripped-down version of the File
Transfer Protocol (FTP). Source: CCNA Study Guide by Todd Lammle, Donald Porter, and James
Chellis (Sybex, 1999).