- A
Port 22 and 23
Why wrong: Port 22 is for SSH and port 23 for Telnet, not SNMP.
- B
Port 80 and 443
Why wrong: Port 80 and 443 are for HTTP and HTTPS, not SNMP.
- C
Port 161 and 162
Port 161 is for SNMP queries and port 162 for SNMP traps.
- D
Port 67 and 68
Why wrong: Port 67 and 68 are for DHCP, not SNMP.
Question 348 of 1,020
SNMP Ports 161 and 162
This 220-1201 practice question tests your understanding of tcp & udp ports. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 technician is configuring a network monitoring tool that uses SNMP to query network devices. Which two ports should be allowed for SNMP communication?
Quick Answer
The answer is ports 161 and 162. SNMP uses port 161 for sending queries, such as GET and SET requests from the monitoring tool to network devices, and port 162 for receiving SNMP traps, which are unsolicited alerts sent from agents to the manager. On the CompTIA A+ Core 1 220-1201 exam, this concept tests your understanding of basic network protocols and their port assignments, often appearing in scenario-based questions about configuring firewalls or network monitoring tools. A common trap is confusing these ports with SSH (22), Telnet (23), or web ports (80/443), so remember that SNMP queries are about polling devices, not remote access. For a quick memory tip: think of 161 as the “one-way request” port and 162 as the “one-way trap” port—both are UDP, and the trap is always one higher than the query.
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 161 and 162
SNMP uses UDP port 161 for sending queries and receiving responses between the manager and agents, and UDP port 162 for the agent to send unsolicited traps or informs to the manager. These two ports must be allowed through firewalls for proper SNMP communication.
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.
- ✗
Port 22 and 23
- ✗
Port 80 and 443
- ✓
Port 161 and 162
Why this is correct
Port 161 is for SNMP queries and port 162 for SNMP traps.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Port 67 and 68
Common exam traps
Common exam trap: answer the scenario, not the keyword
Candidates often mistakenly think SNMP uses a single port or confuse it with other management protocols like SSH or HTTP. Remember that SNMP uses UDP port 161 for queries and responses, and UDP port 162 for traps.
Detailed technical explanation
How to think about this question
SNMP operates over UDP due to its connectionless nature, making it lightweight but requiring careful handling of packet loss. The manager sends Get, GetNext, GetBulk, and Set requests to port 161 on the agent, while the agent sends traps to port 162 on the manager. In real-world deployments, SNMPv3 adds encryption and authentication, but the underlying port numbers remain unchanged per RFC 1157 and RFC 3416.
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
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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: Port 161 and 162 — SNMP uses UDP port 161 for sending queries and receiving responses between the manager and agents, and UDP port 162 for the agent to send unsolicited traps or informs to the manager. These two ports must be allowed through firewalls for proper SNMP communication.
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
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.
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