- A
The CoPP policy was applied to the wrong interface; it must be applied to the management interface.
Why wrong: CoPP is applied to the control plane, not to interfaces.
- B
The class-map for management traffic does not include all required protocols, and the class-default action is drop.
If class-default is not configured with a permit action, the implicit deny drops unmatched traffic, including management traffic not explicitly matched.
- C
The CoPP policy uses rate-limit in bps instead of pps, causing all traffic to be policed.
Why wrong: Rate-limit units affect the policing rate but do not cause complete drop unless the rate is set to 0.
- D
The CoPP policy was applied before the class-maps were fully configured.
Why wrong: The router would reject the policy if class-maps are missing; it would not apply partially.
Quick Answer
The answer is that the class-map for management traffic does not include all required protocols, and the class-default action is drop. This is the most likely explanation because Control Plane Policing (CoPP) policies operate with an implicit deny at the end of the class-map; if the class-map fails to explicitly match every management protocol—such as SSH, SNMP, or NTP—those packets fall through to the default class, and if that class is set to drop, the router becomes unreachable. On the Cisco CCNP ENARSI 300-410 exam, this scenario tests your understanding of CoPP troubleshooting, specifically how misconfigured class-maps can lock out an engineer. A common trap is assuming that allowing “management traffic” in a single class-map covers all protocols, when in reality each protocol must be matched individually. Remember the memory tip: “If you don’t match it, the default will catch it.”
300-410 Administrative Distance Practice Question
This 300-410 practice question tests your understanding of administrative distance. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 applies a Control Plane Policing (CoPP) policy to a router. After applying, the router becomes unreachable via SSH and SNMP, even though the policy allows management traffic. 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:
"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 class-map for management traffic does not include all required protocols, and the class-default action is drop.
CoPP policies have an implicit deny at the end of the class-map. If the class-map for management traffic does not explicitly match all management protocols (e.g., SSH, SNMP, NTP), or if the policy does not have a class-default action to permit, the traffic is dropped.
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 CoPP policy was applied to the wrong interface; it must be applied to the management interface.
Why it's wrong here
CoPP is applied to the control plane, not to interfaces.
- ✓
The class-map for management traffic does not include all required protocols, and the class-default action is drop.
Why this is correct
If class-default is not configured with a permit action, the implicit deny drops unmatched traffic, including management traffic not explicitly matched.
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 CoPP policy uses rate-limit in bps instead of pps, causing all traffic to be policed.
Why it's wrong here
Rate-limit units affect the policing rate but do not cause complete drop unless the rate is set to 0.
- ✗
The CoPP policy was applied before the class-maps were fully configured.
Why it's wrong here
The router would reject the policy if class-maps are missing; it would not apply partially.
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?
Administrative Distance — This question tests Administrative Distance — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: The class-map for management traffic does not include all required protocols, and the class-default action is drop. — CoPP policies have an implicit deny at the end of the class-map. If the class-map for management traffic does not explicitly match all management protocols (e.g., SSH, SNMP, NTP), or if the policy does not have a class-default action to permit, the traffic is dropped.
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: "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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Last reviewed: Jun 18, 2026
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