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300-410 Practice Question: Which THREE symptoms indicate that Control Plane…
Which THREE symptoms indicate that Control Plane Policing (CoPP) might be misconfigured or causing connectivity issues? (Choose THREE.)
⚠ Common exam trap
Cisco often tests the misconception that CoPP only affects management traffic (SSH/Telnet), but candidates forget that routing protocol packets (OSPF, BGP) are also control plane traffic and can be dropped by CoPP, causing neighbor flapping.
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
✓
OSPF or BGP neighbors are flapping, with log messages indicating adjacency timeouts.
CoPP is designed to protect the control plane by rate-limiting traffic. If CoPP is misconfigured with overly restrictive policies, it can drop OSPF or BGP hello packets, causing neighbor adjacencies to time out and flap. Log messages showing adjacency timeouts directly point to control plane packet loss, a classic symptom of CoPP misconfiguration.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
OSPF or BGP neighbors are flapping, with log messages indicating adjacency timeouts.
Why this is correct
If CoPP drops routing protocol hello packets, neighbors may flap, indicating misclassification or overly restrictive policing.
- ✓
SSH or Telnet sessions to the device are intermittent or time out.
Why this is correct
CoPP that polices management traffic too aggressively can cause session drops or timeouts.
- ✓
CPU utilization remains high despite CoPP being configured.
Why this is correct
If CoPP is misconfigured (e.g., not matching the attacking traffic), unwanted packets still reach the CPU, keeping utilization high.
- ✗
CPU utilization is consistently low, and all control plane traffic is passing without drops.
Why it's wrong here
Low CPU and no drops suggest CoPP is working correctly, not misconfigured.
- ✗
Throughput on data interfaces increases significantly.
Why it's wrong here
Data plane throughput is not directly affected by CoPP, which only polices control plane traffic.
Visual reference
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.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 300-410 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 300-410 exam.