Which of the following is the best definition of a socket?

A.
A Session layer link

B.
A MAC address and a port number

C.
An IP address and a port number

D.
An IP address and a MAC address

Explanation:
A socket is the combination of a node address and a port number. When
a connection is made between two systems, the packets need to contain the address
and port address of the sending and receiving system. This is so that the packet can
be properly routed to the receiving system and the receiving system knows who to
reply to.