- A
Drop all packets in that class
Why wrong: Without a police command, packets are not dropped; they are transmitted by default.
- B
Transmit all packets in that class
The default action for a class without a police statement is to permit and transmit all matching traffic.
- C
Log all packets in that class
Why wrong: Logging is not a default action; it must be explicitly configured.
- D
Apply the default aggregate policer
Why wrong: There is no default aggregate policer; CoPP is disabled by default.
Question 1,359 of 2,152
Default Behavior of CoPP Class Without Policer
This 300-410 practice question tests your understanding of control plane policing (copp). This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
What is the default action for a CoPP policy-map class that does not have an explicit 'police' command?
Quick Answer
The answer is transmit all packets in that class. This default behavior exists because CoPP (Control Plane Policing) operates on a permit-by-default philosophy; when a class within a policy-map lacks an explicit police command, the router assumes no rate-limiting or drop action is desired, so it simply forwards every packet matching that class classification. On the Cisco CCNP ENARSI 300-410 exam, this concept tests your understanding that CoPP policy-maps are not inherently restrictive—a common trap is assuming a class without a police action will drop traffic, when in reality it silently permits everything. The exam often presents a scenario where an engineer configures a class for critical control traffic but forgets the police statement, leading to unintended full-rate transmission. A reliable memory tip is "no police, no problem"—if you see a class without the police keyword, remember the router's default is to let it all through, not to block it.
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
✓
Transmit all packets in that class
In Control Plane Policing (CoPP), if a class within a policy-map does not contain an explicit 'police' command, the default action is to transmit all packets matching that class. This is because CoPP operates on a permit-by-default model; only classes with a configured policer will have traffic rate-limited or dropped. The absence of a police action means no restriction is applied, so packets are allowed through to the control plane.
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.
- ✗
Drop all packets in that class
Why it's wrong here
Without a police command, packets are not dropped; they are transmitted by default.
- ✓
Transmit all packets in that class
Why this is correct
The default action for a class without a police statement is to permit and transmit all matching traffic.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Log all packets in that class
Why it's wrong here
Logging is not a default action; it must be explicitly configured.
- ✗
Apply the default aggregate policer
Why it's wrong here
There is no default aggregate policer; CoPP is disabled by default.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that CoPP classes without a police command will drop traffic by default, similar to how an ACL ends with an implicit deny; the trap here is that CoPP uses a permit-by-default model for classes without explicit policing.
Trap categories for this question
Command / output trap
Without a police command, packets are not dropped; they are transmitted by default.
Detailed technical explanation
How to think about this question
Under the hood, CoPP uses Modular QoS CLI (MQC) to classify traffic into classes, and each class can have a policer applied via the 'police' command. If no policer is configured, the class inherits the default action of 'transmit', which is equivalent to a 'permit' in the control plane's implicit ACL behavior. In real-world scenarios, this can lead to unintended traffic reaching the control plane if an administrator forgets to add a police action to a class meant to be rate-limited, potentially causing CPU overload from high-rate traffic like SSH or SNMP.
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 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.
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Control Plane Policing (CoPP) — study guide chapter
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FAQ
Questions learners often ask
What does this 300-410 question test?
Control Plane Policing (CoPP) — This question tests Control Plane Policing (CoPP) — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Transmit all packets in that class — In Control Plane Policing (CoPP), if a class within a policy-map does not contain an explicit 'police' command, the default action is to transmit all packets matching that class. This is because CoPP operates on a permit-by-default model; only classes with a configured policer will have traffic rate-limited or dropped. The absence of a police action means no restriction is applied, so packets are allowed through to the control plane.
What should I do if I get this 300-410 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
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