The answer is HTTP, as the firewall is most likely blocking HTTP traffic on port 80 while allowing HTTPS on port 443. When a web server is accessible but file uploads fail, the core issue often lies in the protocol mismatch: HTTP handles unencrypted web traffic, including file uploads, and if the firewall permits only secure HTTPS connections, the browser’s upload request via HTTP will be silently dropped. On the CompTIA A+ Core 1 220-1201 exam, this question tests your ability to distinguish between HTTP and HTTPS in the context of common firewall rules and port blocking—a frequent trap is assuming that because the server is reachable, all web traffic is allowed. Remember that firewalls often block port 80 by default for security, while leaving port 443 open. A simple memory tip: “HTTP uploads need port 80 open—if it’s blocked, your files are stuck.”
220-1201 Network Protocols Practice Question
This 220-1201 practice question tests your understanding of network protocols. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company's web server is accessible from the internet, but users report that they cannot upload files to it using a web browser. The server is configured to allow file uploads via HTTP. Which protocol is most likely being blocked by the firewall?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
HTTP
This scenario tests understanding of HTTP vs HTTPS and common firewall rules. HTTP uses port 80 for web traffic, and if uploads are failing while the server is reachable, the issue may be that the firewall is blocking HTTP traffic while allowing HTTPS (port 443) or vice versa.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
HTTPS
Why it's wrong here
HTTPS uses port 443 and is encrypted; if the server is accessible but uploads fail, HTTP is more likely blocked.
✗
FTP
Why it's wrong here
FTP is a separate protocol for file transfers, but the scenario specifies uploads via a web browser, which uses HTTP.
✓
HTTP
Why this is correct
HTTP uses port 80 and is commonly used for web uploads; if blocked, uploads fail while the server may still be reachable via HTTPS.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Trap categories for this question
Scenario analysis trap
FTP is a separate protocol for file transfers, but the scenario specifies uploads via a web browser, which uses HTTP.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the 220-1201 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 220-1201 question in full detail.
Identify which 220-1201 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Network Protocols — This question tests Network Protocols — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: HTTP — This scenario tests understanding of HTTP vs HTTPS and common firewall rules. HTTP uses port 80 for web traffic, and if uploads are failing while the server is reachable, the issue may be that the firewall is blocking HTTP traffic while allowing HTTPS (port 443) or vice versa.
What should I do if I get this 220-1201 question wrong?
Identify which 220-1201 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
This 220-1201 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 220-1201 exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.