- A
The NMS server is not listening on UDP port 162.
Why wrong: The NMS server is reachable via ping, but this does not confirm the SNMP trap receiver is listening; however, the more common cause on the router side is the missing trap-source.
- B
The 'snmp-server trap-source' command is missing, causing traps to use an incorrect source IP.
Without 'snmp-server trap-source', the router uses the outgoing interface IP, which may not match the NMS's expected source or may be unreachable.
- C
The SNMP community string 'public' is not configured on the router.
Why wrong: The community 'public' is configured in the 'snmp-server host' command, and 'show snmp' would show it; missing community would prevent responses to polls, not traps.
- D
The router's ACL is blocking outbound UDP traffic to port 162.
Why wrong: While possible, the engineer can ping the NMS, and typically SNMP traps use UDP; an ACL blocking UDP 162 would be a less common default scenario.
Quick Answer
The answer is a missing `snmp-server trap-source` command, which causes the router to source SNMP traps from an interface that may not be reachable or may present an incorrect source IP to the NMS server. Even with `snmp-server enable traps` and a properly configured host, the router selects the outgoing interface’s IP as the trap source by default; if that interface is not the one the NMS expects (e.g., a loopback or management interface), the NMS may drop or ignore the traps. On the Cisco CCNP ENARSI 300-410 exam, this scenario tests your understanding of SNMP trap delivery mechanics and the importance of explicit source-interface configuration, often appearing as a subtle troubleshooting trap where ping succeeds but traps fail. A common memory tip is “traps need a trusted source”—always verify that the trap-source matches the NMS’s expected IP, or use a loopback interface to ensure consistent reachability.
300-410 Device Management Practice Question
This 300-410 practice question tests your understanding of device management. 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 network engineer is troubleshooting a router that is not sending SNMP traps to the NMS server at 10.1.1.100. The SNMP configuration includes 'snmp-server enable traps' and 'snmp-server host 10.1.1.100 version 2c public'. The engineer can ping the NMS server from the router, and 'show snmp' indicates SNMP is enabled. What is the most likely cause of the missing traps?
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 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
The 'snmp-server trap-source' command is missing, causing traps to use an incorrect source IP.
The router has SNMP traps enabled and a host configured, but the 'snmp-server trap-source' command is missing, causing traps to be sourced from an interface that may not be reachable or may have an incorrect source IP that the NMS expects.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The NMS server is not listening on UDP port 162.
Why it's wrong here
The NMS server is reachable via ping, but this does not confirm the SNMP trap receiver is listening; however, the more common cause on the router side is the missing trap-source.
- ✓
The 'snmp-server trap-source' command is missing, causing traps to use an incorrect source IP.
Why this is correct
Without 'snmp-server trap-source', the router uses the outgoing interface IP, which may not match the NMS's expected source or may be unreachable.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Standard ACLs match source addresses.
- ✗
The SNMP community string 'public' is not configured on the router.
Why it's wrong here
The community 'public' is configured in the 'snmp-server host' command, and 'show snmp' would show it; missing community would prevent responses to polls, not traps.
- ✗
The router's ACL is blocking outbound UDP traffic to port 162.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Trap categories for this question
Command / output trap
The community 'public' is configured in the 'snmp-server host' command, and 'show snmp' would show it; missing community would prevent responses to polls, not traps.
Scenario analysis trap
While possible, the engineer can ping the NMS, and typically SNMP traps use UDP; an ACL blocking UDP 162 would be a less common default scenario.
Detailed technical explanation
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
- Standard ACLs match source addresses.
- Extended ACLs can match source, destination, protocol and ports.
- The first matching ACL entry is used.
- There is usually an implicit deny at the end.
TExam Day Tips
- Check inbound versus outbound direction.
- Read the ACL from top to bottom.
- Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Real-world example
How this comes up in practice
A security administrator must allow nursing staff to reach a patient records server while blocking access from the guest Wi-Fi VLAN. After applying an extended ACL, traffic is still blocked from nursing workstations. The ACL was applied outbound instead of inbound on the wrong interface. Questions like this test ACL direction and placement rules.
What to study next
Got this wrong? Here's your next step.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related 300-410 ACL questions on filtering logic and placement.
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Device Management — study guide chapter
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FAQ
Questions learners often ask
What does this 300-410 question test?
Device Management — This question tests Device Management — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: The 'snmp-server trap-source' command is missing, causing traps to use an incorrect source IP. — The router has SNMP traps enabled and a host configured, but the 'snmp-server trap-source' command is missing, causing traps to be sourced from an interface that may not be reachable or may have an incorrect source IP that the NMS expects.
What should I do if I get this 300-410 question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related 300-410 ACL questions on filtering logic and placement.
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?
Standard ACLs match source addresses.
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Last reviewed: Jun 18, 2026
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