Luke must advise his users about which client to employ when accessing remote systems. Which of the following is a connection-oriented protocol that can contain unencrypted password information from Telnet sessions?

A.
TCP

B.
TTP

C.
HTTP

D.
UDP

Explanation:
TCP is a connection oriented protocol which operates on the transport layer (Layer 4). This is the transport used by the telnet client.
Incorrect Answers:
B: There is no TTP protocol.
C: HTTP is an application protocol that is based on TCP.
D: UDP is a connection-less protocol.