200-901 Network Fundamentals Practice Question
A developer is configuring a new application server and needs to allow HTTP traffic from web clients. Which port should be opened on the firewall to permit standard unencrypted HTTP traffic?
⚠ Common exam trap
The trap here is mixing up port 80 (HTTP) with port 443 (HTTPS) or other common ports like 22 (SSH) and 53 (DNS).
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 by default uses TCP port 80 for unencrypted communication. When a client makes an HTTP request to a web server, it connects to port 80 unless another port is specified. Therefore, to allow standard HTTP traffic, the firewall must permit inbound connections on port 80.
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
Why this is correct
Port 80 is the default port for HTTP (Hypertext Transfer Protocol) used for unencrypted web traffic. Web servers listen on port 80 for standard HTTP requests. Opening this port on the firewall allows clients to access web content over HTTP, matching the requirement.
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Port 22
Why it's wrong here
Port 22 is used for SSH (Secure Shell), which provides encrypted remote login and file transfer. It is not used for HTTP traffic. Allowing port 22 would permit SSH access, not web traffic, so it is incorrect for this scenario.
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Port 53
Why it's wrong here
Port 53 is used for DNS (Domain Name System) queries, which resolve domain names to IP addresses. It is not used for HTTP traffic. Opening port 53 would allow DNS traffic, not web traffic, so it does not meet the requirement.
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Port 443
Why it's wrong here
Port 443 is used for HTTPS, which is HTTP over TLS/SSL for encrypted web traffic. While it is used for web traffic, it is not the standard unencrypted HTTP port. The scenario specifically asks for unencrypted HTTP, so port 443 is incorrect.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Cisco exam blueprint
This 200-901 practice question is part of Courseiva's free Cisco 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 200-901 exam.