- A
BGP is not receiving any routes due to CoPP dropping updates.
Why wrong: One route is received, so updates are being processed.
- B
BGP is receiving routes correctly, and CoPP is not interfering with inbound updates.
The route is received from neighbor 10.1.1.2 with valid attributes.
- C
BGP is receiving routes but not installing them in the routing table due to CoPP.
Why wrong: The output shows received routes, not installation status.
- D
BGP session is flapping due to CoPP.
Why wrong: No session flap is indicated; the output is stable.
Question 2,067 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 bgp neighbors 10.1.1.2 received-routes
BGP table version is 10, local router ID is 10.1.1.1 Status codes: s suppressed, d damped, h history, * valid, > best, i - internal, r RIB-failure, S stale, m multipath, b backup-path, f RT-Filter, x best-external, a additional-path, c RIB-compressed, Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path *> 10.3.3.0/24 10.1.1.2 0 100 0 i
Total number of prefixes 1
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
✓
BGP is receiving routes correctly, and CoPP is not interfering with inbound updates.
The output shows a single BGP prefix (10.3.3.0/24) received from neighbor 10.1.1.2, with the route marked as valid (*) and best (>). This confirms that BGP is successfully receiving and processing the update, and the route is eligible for installation in the routing table. Since the route appears in the received-routes output, CoPP is not dropping the inbound BGP update packets, as CoPP would prevent the packets from reaching the BGP process entirely.
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.
- ✗
BGP is not receiving any routes due to CoPP dropping updates.
Why it's wrong here
One route is received, so updates are being processed.
- ✓
BGP is receiving routes correctly, and CoPP is not interfering with inbound updates.
Why this is correct
The route is received from neighbor 10.1.1.2 with valid attributes.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
BGP is receiving routes but not installing them in the routing table due to CoPP.
Why it's wrong here
The output shows received routes, not installation status.
- ✗
BGP session is flapping due to CoPP.
Why it's wrong here
No session flap is indicated; the output is stable.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between CoPP dropping packets before they reach the BGP process (which would show no received routes) versus BGP receiving routes but not installing them due to other reasons like RIB-failure or policy, leading candidates to incorrectly assume CoPP affects route installation.
Trap categories for this question
Command / output trap
The output shows received routes, not installation status.
Detailed technical explanation
How to think about this question
The 'show bgp neighbors received-routes' command displays all routes received from a neighbor before any inbound policy is applied, but after CoPP has allowed the TCP packets to reach the BGP process. CoPP operates at the control plane level, policing packets destined to the router's CPU; if CoPP were dropping BGP updates, the TCP session would still be up (keepalives might pass), but the UPDATE messages would be discarded, resulting in an empty received-routes table. In real-world scenarios, CoPP misconfiguration often manifests as partial route reception or session timeouts, not as routes appearing in the BGP table with valid/best status.
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.
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: BGP is receiving routes correctly, and CoPP is not interfering with inbound updates. — The output shows a single BGP prefix (10.3.3.0/24) received from neighbor 10.1.1.2, with the route marked as valid (*) and best (>). This confirms that BGP is successfully receiving and processing the update, and the route is eligible for installation in the routing table. Since the route appears in the received-routes output, CoPP is not dropping the inbound BGP update packets, as CoPP would prevent the packets from reaching the BGP process entirely.
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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