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CAS-004 Practice Question: Match each port number to its associated protocol.
Match each port number to its associated protocol.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Port 80: HTTP
These are standard IANA port assignments for common protocols. Correct matches: Port 80=HTTP, Port 443=HTTPS, Port 22=SSH, Port 21=FTP. Common confusions involve swapping port numbers for similar protocols.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Port 80: HTTP
Why this is correct
Port 80 is the default port for HTTP traffic.
- ✓
Port 443: HTTPS
Why this is correct
Port 443 is the default port for HTTPS (HTTP over SSL/TLS).
- ✓
Port 22: SSH
Why this is correct
Port 22 is the default port for SSH (Secure Shell).
- ✓
Port 21: FTP
Why this is correct
Port 21 is the default control port for FTP.
- ✗
Port 80: HTTPS
Why it's wrong here
Incorrect — HTTPS uses port 443, not 80.
- ✗
Port 22: Telnet
Why it's wrong here
Incorrect — Telnet uses port 23, not 22.
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About these practice questions
One of 968 original CAS-005 practice questions on Courseiva, each with a full explanation and wrong-answer analysis — not exam dumps or protected exam content. Learn why practice questions differ from exam dumps →
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This CAS-005 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the CAS-005 exam.