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GCIA · Question #60

Web applications are accessed by communicating over TCP ports via an IP address. Choose the two most common Web Application TCP ports and their respective protocol names. Each correct answer…

The correct answer is B. TCP Port 443 / HTTPS or SSL C. TCP Port 80 / HTTP. Web applications use two primary TCP ports - port 80 for unencrypted HTTP traffic and port 443 for encrypted HTTPS or SSL/TLS traffic. The correct protocol names matter for accurate identification.

Network Traffic Analysis & Protocol Review

Question

Web applications are accessed by communicating over TCP ports via an IP address. Choose the two most common Web Application TCP ports and their respective protocol names. Each correct answer represents a complete solution. Choose two.

Options

  • ATCP Port 443 / S-HTTP or SSL
  • BTCP Port 443 / HTTPS or SSL
  • CTCP Port 80 / HTTP
  • DTCP Port 80 / HTTPS or SSL

How the community answered

(16 responses)
  • A
    6% (1)
  • B
    75% (12)
  • D
    19% (3)

Why each option

Web applications use two primary TCP ports - port 80 for unencrypted HTTP traffic and port 443 for encrypted HTTPS or SSL/TLS traffic. The correct protocol names matter for accurate identification.

ATCP Port 443 / S-HTTP or SSL

S-HTTP (Secure HTTP) is a largely obsolete and rarely deployed alternative secure web protocol distinct from HTTPS; port 443 is not associated with S-HTTP in standard usage.

BTCP Port 443 / HTTPS or SSLCorrect

TCP port 443 is assigned to HTTPS (Hypertext Transfer Protocol Secure), which operates over SSL/TLS to encrypt web traffic - making 'HTTPS or SSL' the correct protocol designation for this port.

CTCP Port 80 / HTTPCorrect

TCP port 80 is the standard, well-known port for HTTP (Hypertext Transfer Protocol), the unencrypted web communication protocol defined in RFC 7230.

DTCP Port 80 / HTTPS or SSL

Port 80 is assigned to plain HTTP, not HTTPS or SSL - encrypted web traffic runs on port 443, so labeling port 80 as HTTPS or SSL is technically incorrect.

Concept tested: Standard TCP port assignments for HTTP and HTTPS

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

Topics

#HTTP#HTTPS#TCP ports#web protocols

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