- A
The ACL for the 'public' community string was accidentally removed when the 'monitor' community string was added.
If the engineer used the 'no snmp-server community public' command to reconfigure, the ACL might have been removed; the new configuration might not include the ACL, allowing all IPs or none.
- B
The second community string 'monitor' has a higher priority and overrides the first.
Why wrong: Community strings are independent; the router matches the community string in the request.
- C
The router can only support one community string at a time.
Why wrong: Routers support multiple community strings.
- D
The first NMS must be reconfigured to use the 'monitor' community string.
Why wrong: The first NMS can continue to use 'public' if it is still configured.
Quick Answer
The answer is that the ACL for the 'public' community string was accidentally removed when the 'monitor' community string was added. This is the most likely explanation because SNMPv2c relies on per-community ACLs to control access; when you configure a second community string, the router does not merge or overwrite existing ACLs unless the configuration command explicitly replaces the entire community entry. In the Cisco CCNP ENARSI 300-410 exam, this scenario tests your understanding of how SNMP multiple communities break access when a configuration change inadvertently drops a previously applied ACL, a common trap where candidates assume the first NMS should still work based on the community string alone. The key insight is that each community string is an independent access control point, and the router checks the ACL associated with the received community string, not a combined list. Memory tip: "Each community gets its own bouncer—if you swap out the bouncer for 'public', the old guest gets turned away."
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 configures SNMPv2c with a community string 'public' and an ACL that permits only the NMS IP address. The NMS can poll the router successfully. Later, the engineer adds a second community string 'monitor' with a different ACL that permits a second NMS. The first NMS now fails to poll. Which is the most likely explanation?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"first"Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
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 ACL for the 'public' community string was accidentally removed when the 'monitor' community string was added.
When multiple community strings are configured, the router matches the community string from the request. If the first NMS sends the community string 'public', it should still work. However, if the ACL for 'public' is inadvertently removed or modified, or if the second community string's ACL inadvertently blocks the first NMS, issues can arise.
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 for the 'public' community string was accidentally removed when the 'monitor' community string was added.
Why this is correct
If the engineer used the 'no snmp-server community public' command to reconfigure, the ACL might have been removed; the new configuration might not include the ACL, allowing all IPs or none.
Clue confirmation
The clue words "first", "most likely" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
- ✗
The second community string 'monitor' has a higher priority and overrides the first.
Why it's wrong here
Community strings are independent; the router matches the community string in the request.
- ✗
The router can only support one community string at a time.
Why it's wrong here
Routers support multiple community strings.
- ✗
The first NMS must be reconfigured to use the 'monitor' community string.
Why it's wrong here
The first NMS can continue to use 'public' if it is still configured.
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.
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 for the 'public' community string was accidentally removed when the 'monitor' community string was added. — When multiple community strings are configured, the router matches the community string from the request. If the first NMS sends the community string 'public', it should still work. However, if the ACL for 'public' is inadvertently removed or modified, or if the second community string's ACL inadvertently blocks the first NMS, issues can arise.
What should I do if I get this 300-410 question wrong?
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.
Are there clue words in this question I should notice?
Yes — watch for: "first", "most likely". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 18, 2026
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