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Which layer 4 protocol is used for a Telnet connection?

  • A.
    IP
  • B.
    TCP
  • C.TCP/IP
  • D.UDP

Answer: B

Correct answer: TCP

Telnet needs the characters to arrive in order and without loss, so it runs over TCP, on port 23. IP is a layer 3 protocol, TCP/IP is the name of the suite rather than a protocol, and UDP would deliver a terminal session with characters missing or out of sequence.

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