- A
515
Why wrong: Port 515 is LPD, a different printing protocol, not IPP.
- B
9100
Why wrong: Port 9100 is used by raw printing (JetDirect), not IPP.
- C
631
Port 631 is the default port for IPP, used for network printing.
- D
80
Why wrong: Port 80 is HTTP, used for web traffic, not printing.
Question 183 of 1,020
220-1201 TCP & UDP Ports Practice Question
This 220-1201 practice question tests your understanding of tcp & udp ports. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 small office uses a network printer that supports both IPP and LPD printing. The printer is configured to use the default port for IPP. Which port must be open on the firewall for printing to work?
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
✓
631
IPP (Internet Printing Protocol) uses TCP port 631 by default, as defined in RFC 2911. Since the printer is configured to use the default port for IPP, the firewall must allow inbound traffic on port 631 for printing to function.
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.
- ✗
515
Why it's wrong here
Port 515 is LPD, a different printing protocol, not IPP.
- ✗
9100
Why it's wrong here
Port 9100 is used by raw printing (JetDirect), not IPP.
- ✓
631
Why this is correct
Port 631 is the default port for IPP, used for network printing.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
80
Why it's wrong here
Port 80 is HTTP, used for web traffic, not printing.
Common exam traps
Common exam trap: answer the scenario, not the keyword
A common trap in CompTIA A+ exams is confusing IPP (port 631) with LPD (port 515) or HTTP (port 80) since IPP is HTTP-based. Candidates may incorrectly choose port 515 assuming all network printing uses LPD, or port 80 thinking IPP uses standard HTTP.
Detailed technical explanation
How to think about this question
IPP encapsulates print jobs and printer status in HTTP POST requests, using MIME types like 'application/octet-stream' for print data. The printer's IPP endpoint typically listens on TCP 631, and the client sends print jobs via HTTP POST to the printer's URL (e.g., http://printer-ip:631/ipp/print). In real-world scenarios, if the firewall blocks port 631 but allows port 80, IPP printing will fail unless the printer is explicitly configured to use port 80.
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.
TExam Day Tips
- 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.
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this 220-1201 question test?
TCP & UDP Ports — This question tests TCP & UDP Ports — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: 631 — IPP (Internet Printing Protocol) uses TCP port 631 by default, as defined in RFC 2911. Since the printer is configured to use the default port for IPP, the firewall must allow inbound traffic on port 631 for printing to function.
What should I do if I get this 220-1201 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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