Which protocol does SSH use?

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BlackTom AI · Accepted Answer

The question asks which protocol SSH uses, so I'll evaluate each option one by one to understand why SSH uses TCP.
Option a) ICMP: ICMP is used for error messages and diagnostic utilities like ping. It is not a transport protocol and does not provide reliable data streams, which SSH requires. Therefore, ICMP is incorrect for SSH.
Option b) UDP: UDP is a connectionless transport protocol that offers minimal overhead but does not guarantee delivery, ordering, or data integrity. SSH needs reliable, ordered delivery to securely transmit session data, so UDP is unsuitable for SSH.
Option c) TCP: TCP is a connection-oriented transport protocol that provides reliable, ordered, and error-checked delivery of a stream of bytes. SSH relies on these guarantees to securely establish and maintain an interactive session, perform key exchange, and encrypt all traffic. This makes TCP the correct choice.
Option d) HTTP: HTTP is an application-layer protocol used for transferring hypertext, typically over TCP. While HTTP does use TCP, SSH is not an HTTP-based protocol and does not use the application layer protocol; SSH operates at the transport layer using TCP. Hence HTTP is incorrect for SSH.
In summary, the only option that provides the necessary reliable, ordered transport for SSH is TCP, while ICMP and UDP lack reliability, and HTTP is unrelated to SSH’s transport mechanism.

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Which protocol does SSH use?

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