Which application-layer protocol communicates by default over the well-known TCP port number 443?
HTTPS
SSH
SLP
Telnet
HTTPS (Hypertext Transfer Protocol Secure) uses TCP port 443 for encrypted web traffic by default. Telnet communicates on TCP port 23, SSH on TCP port 22, and the Service Location Protocol (SLP) on TCP/UDP port 427. Only HTTPS matches port 443.
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