Which transport-layer protocol does Secure Shell (SSH) rely on by default to provide reliable, connection-oriented communication over port 22?
UDP
ICMP
SCTP
TCP
SSH relies on the Transmission Control Protocol (TCP). TCP establishes a reliable, ordered, and error-checked connection (via the three-way handshake) before data is exchanged. Because UDP is connectionless and does not guarantee delivery or order, it is not suitable for SSH's secure remote-access requirements. ICMP is used for control messages, and SCTP is a different transport protocol rarely used for SSH.
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