Question 1,390 of 2,152

SNMP Troubleshooting →mediumMultiple ChoiceObjective-mapped

Quick Answer

The answer is an ACL direction misconfiguration: the extended ACL 100 is applied inbound on the interface, but it must be applied outbound to allow SNMP traps to leave the router. SNMP traps are unsolicited messages sent from the router’s source port 162 to the NMS’s destination port 162, so the ACL must permit this outbound traffic from the router’s own IP to the NMS. The described ACL only permits incoming UDP 162 from the NMS, which blocks the trap transmission. On the Cisco CCNP ENARSI 300-410 exam, this tests your understanding that ACL direction is relative to the router’s perspective—traffic leaving the router requires an outbound ACL, even if the NMS is the ultimate destination. A common trap is assuming the ACL should mirror the NMS’s receive direction. Remember the memory tip: “Traps go out, so ACL points out.”

300-410 SNMP Troubleshooting Practice Question

This 300-410 practice question tests your understanding of snmp troubleshooting. 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.

An engineer is troubleshooting why the NMS is not receiving SNMP traps from router R2. The configuration includes 'snmp-server enable traps', 'snmp-server host 10.1.1.100 version 2c public', and an extended ACL 100 that permits UDP port 162 from 10.1.1.100. The NMS can ping R2. What is the most likely cause?

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.

Question 1mediummultiple choice

Study the full ACL explanation →

A
The ACL is applied inbound on the interface, but it should be applied outbound to allow trap packets to leave the router.
Correct because traps are sent from the router; the ACL must permit outbound UDP port 162 to the NMS, not inbound.
B
The 'snmp-server host' command is missing the 'trap' keyword, causing the router to send informs instead.
Why wrong: Incorrect because 'snmp-server host' defaults to traps; no keyword is needed.
C
The community string 'public' is case-sensitive; the NMS is using 'Public' with a capital P.
Why wrong: Incorrect because case sensitivity would cause authentication failure, but the NMS can ping, and the issue is likely ACL-related.
D
The router needs the 'snmp-server trap-source' command to specify the source interface for traps.
Why wrong: Incorrect because while trap-source can help, it is not required; the default source IP is the outgoing interface IP.

Full breakdown with real-world context →

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 ACL is applied inbound on the interface, but it should be applied outbound to allow trap packets to leave the router.

SNMP traps are sent from the router (source port 162) to the NMS (destination port 162), but the ACL on the router must permit outgoing traffic from the router's source port 162 to the NMS. The ACL as described only permits incoming UDP 162 from the NMS, which is incorrect.

Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.

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 ACL is applied inbound on the interface, but it should be applied outbound to allow trap packets to leave the router.
Why this is correct
Correct because traps are sent from the router; the ACL must permit outbound UDP port 162 to the NMS, not inbound.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
✗
The 'snmp-server host' command is missing the 'trap' keyword, causing the router to send informs instead.
Why it's wrong here
Incorrect because 'snmp-server host' defaults to traps; no keyword is needed.
✗
The community string 'public' is case-sensitive; the NMS is using 'Public' with a capital P.
Why it's wrong here
Incorrect because case sensitivity would cause authentication failure, but the NMS can ping, and the issue is likely ACL-related.
✗
The router needs the 'snmp-server trap-source' command to specify the source interface for traps.
Why it's wrong here
Incorrect because while trap-source can help, it is not required; the default source IP is the outgoing interface IP.

Common exam traps

Common exam trap: NAT rules depend on direction and matching traffic

NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.

Trap categories for this question

Keyword trap
Incorrect because 'snmp-server host' defaults to traps; no keyword is needed.

Detailed technical explanation

How to think about this question

NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.

KKey Concepts to Remember

Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.

TExam Day Tips

Identify inside and outside interfaces first.
Check whether the scenario needs static NAT, dynamic NAT or PAT.
Do not confuse NAT matching ACLs with normal packet-filtering intent.

Key takeaway

NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.

Real-world example

How this comes up in practice

A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.

What to study next

Got this wrong? Here's your next step.

Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 300-410 NAT questions on configuration and troubleshooting.

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FAQ

Questions learners often ask

What does this 300-410 question test?

SNMP Troubleshooting — This question tests SNMP Troubleshooting — Static NAT maps one inside address to one outside address..

What is the correct answer to this question?

The correct answer is: The ACL is applied inbound on the interface, but it should be applied outbound to allow trap packets to leave the router. — SNMP traps are sent from the router (source port 162) to the NMS (destination port 162), but the ACL on the router must permit outgoing traffic from the router's source port 162 to the NMS. The ACL as described only permits incoming UDP 162 from the NMS, which is incorrect.

What should I do if I get this 300-410 question wrong?

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?

Static NAT maps one inside address to one outside address.

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