What TCP port does SSL/TLS use for HTTPS communications?

The correct answer is D. TCP 443. HTTPS (HTTP over SSL/TLS) is standardized to operate on TCP port 443 as assigned by IANA.

Security Technologies

Question

Options

ATCP 563
BTCP 626
CTCP 80
DTCP 443

How the community answered

(26 responses)

B
4% (1)
C
4% (1)
D
92% (24)

Why each option

HTTPS (HTTP over SSL/TLS) is standardized to operate on TCP port 443 as assigned by IANA.

ATCP 563

TCP 563 is the IANA-assigned port for SNEWS (SSL-wrapped NNTP news), not HTTPS.

BTCP 626

TCP 626 is not a recognized standard port for HTTPS or any common SSL/TLS-secured application.

CTCP 80

TCP 80 is the standard port for plain unencrypted HTTP, not HTTPS.

DTCP 443Correct

TCP port 443 is the IANA-assigned well-known port for HTTPS, meaning HTTP traffic encrypted via SSL/TLS travels over this port by default on all major web servers and browsers.

Concept tested: HTTPS standard TCP port assignment

Source: https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml

Topics

#SSL/TLS#HTTPS#TCP port 443#network protocols

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