Which service, command or tool allows a remote user to interface with a system as if he were sitting at the terminal?

A.
Host

B.
Finger

C.
SetRequest

D.
Telnet

Explanation:
Telnet, which operates on port 23, is a client that provides a terminal window on the target system.
Incorrect Answers:
A: Host is a Unix based command used to resolve a host name to an IP addresss, or IP address to the host name, and can also provide information on mail servers.
B: Finger is a command used to find out information about a node.
C: SetRequest is a function of SNMP, which is used for network monitoring and control.
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