- A
CoPP aggregate policer
Why wrong: The aggregate policer applies to all traffic in the class, not per-source exceptions.
- B
Control Plane Protection (CPPr) exception
CPPr allows defining exceptions to bypass CoPP for trusted sources, such as management stations or routing peers.
- C
QoS pre-classify
Why wrong: QoS pre-classify is used for VPN traffic classification, not for CoPP exceptions.
- D
Policy-map 'set' action
Why wrong: The 'set' action modifies packet markings, but does not create exceptions to policing.
Question 909 of 2,152
Using CPPr Exceptions to Bypass CoPP Rate Limiting
This 300-410 practice question tests your understanding of control plane policing (copp). Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
Which CoPP feature allows the control plane to process packets from a specific source IP address without rate limiting?
Quick Answer
The answer is Control Plane Protection (CPPr) exception. This feature allows the control plane to process packets from a specific source IP address without applying CoPP rate limiting by using the `exception` keyword within a class-map, which bypasses the normal policy-map policing actions. On the Cisco CCNP ENARSI 300-410 exam, this tests your understanding of how CPPr extends CoPP by offering granular control, including host-specific exceptions for trusted sources like management servers. A common trap is confusing CPPr exceptions with CoPP’s permit ACLs—remember that CPPr exceptions are defined in the class-map, not the policy-map, and they completely skip rate limiting rather than just matching traffic. For a memory tip, think of the exception as an “express lane” for specific source IPs: once you add the `exception` keyword, that traffic bypasses all CoPP policing, ensuring critical management traffic is never dropped.
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
✓
Control Plane Protection (CPPr) exception
Control Plane Protection (CPPr) extends CoPP by allowing granular control over which packets are subject to rate limiting. The CPPr exception feature specifically permits packets from a trusted source IP address to bypass all rate-limiting policies, ensuring critical traffic like routing protocol updates or management access is never dropped even under attack conditions.
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.
- ✗
CoPP aggregate policer
Why it's wrong here
The aggregate policer applies to all traffic in the class, not per-source exceptions.
- ✓
Control Plane Protection (CPPr) exception
Why this is correct
CPPr allows defining exceptions to bypass CoPP for trusted sources, such as management stations or routing peers.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
QoS pre-classify
- ✗
Policy-map 'set' action
Why it's wrong here
The 'set' action modifies packet markings, but does not create exceptions to policing.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between CoPP (which applies rate limits to all matched traffic) and CPPr (which can create exceptions), leading candidates to mistakenly think aggregate policers or QoS actions can achieve the same per-source exemption.
Detailed technical explanation
How to think about this question
CPPr exception is configured under the control-plane host or transit sub-mode using the 'exception' keyword, often paired with an access-list to match specific source IPs. This feature leverages the control plane's internal packet processing path to skip the policing engine entirely, which is distinct from simply raising the policer rate. In real-world scenarios, this is critical for preserving BGP or OSPF keepalives from a trusted peer during a DoS attack, as aggregate CoPP would drop them if the policer is exceeded.
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.
Quick reference
Routing Protocol Comparison
| Protocol | Metric | Max Hops | Algorithm | Type |
|---|---|---|---|---|
| RIP v2 | Hop count | 15 | Bellman-Ford | Distance vector |
| OSPF | Cost (bandwidth) | Unlimited | Dijkstra (SPF) | Link state |
| EIGRP | Composite metric | Unlimited | DUAL | Hybrid |
| IS-IS | Cost | Unlimited | Dijkstra | Link state |
| BGP | Policy / attributes | Unlimited | Path vector | Path vector |
RIP's 15-hop limit makes it unsuitable for large networks. OSPF and EIGRP dominate modern enterprise deployments.
What to study next
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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: Control Plane Protection (CPPr) exception — Control Plane Protection (CPPr) extends CoPP by allowing granular control over which packets are subject to rate limiting. The CPPr exception feature specifically permits packets from a trusted source IP address to bypass all rate-limiting policies, ensuring critical traffic like routing protocol updates or management access is never dropped even under attack conditions.
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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