Which transport protocol and default port combination is used by Secure Shell (SSH) to create a reliable, connection-oriented channel for remote administration?
UDP port 161
TCP port 23
TCP port 22
UDP port 22
SSH relies on the Transmission Control Protocol (TCP) because TCP establishes a three-way handshake that guarantees a reliable, ordered stream of data. The Internet Assigned Numbers Authority (IANA) designates TCP port 22 as the well-known port for SSH servers. Options using UDP are incorrect because UDP is connectionless, while the port numbers 23 and 161 correspond to Telnet and SNMP, not SSH.
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