- A
OSPF is not forming adjacencies due to CoPP dropping Hello packets.
Why wrong: The output shows one adjacent neighbor, so adjacencies are formed.
- B
OSPF is operating normally with one neighbor, suggesting CoPP is not impacting OSPF.
The interface is up, timers are normal, and an adjacency exists.
- C
OSPF is experiencing DR/BDR election issues due to CoPP.
Why wrong: The router is DR, and the neighbor is BDR, indicating a successful election.
- D
OSPF is not receiving Hello packets due to CoPP.
Why wrong: The neighbor count of 1 indicates Hello packets are being received.
Question 1,919 of 2,152
300-410 Control Plane Policing (CoPP) Practice Question
This 300-410 practice question tests your understanding of control plane policing (copp). 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.
A network engineer runs the following command to troubleshoot a Control Plane Policing (CoPP) issue:
R1# show ip ospf interface detail
FastEthernet0/0 is up, line protocol is up Internet Address 10.1.1.1/24, Area 0.0.0.0, Attached via Network Statement Process ID 1, Router ID 10.1.1.1, Network Type BROADCAST, Cost: 1 Topology-MTID Cost Disabled Shutdown Topology Name 0 1 no no Base Transmit Delay is 1 sec, State DR, Priority 1 Designated Router (ID) 10.1.1.1, Interface address 10.1.1.1 Backup Designated router (ID) 10.1.1.2, Interface address 10.1.1.2 Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5 oob-resync timeout 40 Hello due in 00:00:03 Supports Link-local Signaling (LLS) Index 1/1, flood queue length 0 Next 0x0(0)/0x0(0) Last flood scan length is 1, maximum is 25 Last flood scan time is 0 msec, maximum is 4 msec
Neighbor Count is 1, Adjacent neighbor count is 1
Adjacent with neighbor 10.1.1.2 (Backup Designated Router) Suppress hello for 0 neighbor(s)
What does this output indicate?
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 is operating normally with one neighbor, suggesting CoPP is not impacting OSPF.
The output shows that OSPF has formed a full adjacency with neighbor 10.1.1.2, which is the Backup Designated Router. The neighbor count is 1 and the adjacent neighbor count is 1, indicating that OSPF is operating normally on this interface. Therefore, CoPP is not impacting OSPF Hello or adjacency formation.
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.
- ✗
OSPF is not forming adjacencies due to CoPP dropping Hello packets.
Why it's wrong here
The output shows one adjacent neighbor, so adjacencies are formed.
- ✓
OSPF is operating normally with one neighbor, suggesting CoPP is not impacting OSPF.
Why this is correct
The interface is up, timers are normal, and an adjacency exists.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
OSPF is experiencing DR/BDR election issues due to CoPP.
Why it's wrong here
The router is DR, and the neighbor is BDR, indicating a successful election.
- ✗
OSPF is not receiving Hello packets due to CoPP.
Why it's wrong here
The neighbor count of 1 indicates Hello packets are being received.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that any CoPP configuration automatically disrupts OSPF, but the trap here is that the 'show ip ospf interface detail' output explicitly shows a working adjacency, proving CoPP is not the issue.
Trap categories for this question
Command / output trap
The output shows one adjacent neighbor, so adjacencies are formed.
Detailed technical explanation
How to think about this question
CoPP uses a control-plane service policy to rate-limit or drop control plane traffic like OSPF Hellos. If CoPP were dropping Hellos, the OSPF neighbor state would not reach FULL, and the 'Neighbor Count' would be 0. The 'Hello due in 00:00:03' timer confirms Hellos are being sent and received on schedule, ruling out CoPP interference.
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 network engineer at a university connects two campus buildings via a fibre link. Both routers run OSPF, but no adjacency forms — even though both routers can ping each other. The engineer finds one router is in area 0 and the other in area 1. OSPF adjacency requires matching area numbers, hello/dead timers, and network type. IP reachability alone is not enough.
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.
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: OSPF is operating normally with one neighbor, suggesting CoPP is not impacting OSPF. — The output shows that OSPF has formed a full adjacency with neighbor 10.1.1.2, which is the Backup Designated Router. The neighbor count is 1 and the adjacent neighbor count is 1, indicating that OSPF is operating normally on this interface. Therefore, CoPP is not impacting OSPF Hello or adjacency formation.
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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