- A
The routing table is empty due to CoPP dropping routing updates.
Why wrong: The output shows 500 prefixes, so the routing table is populated.
- B
The routing table has 500 prefixes, indicating that routing protocols are functioning and CoPP is not blocking updates.
A healthy routing table with no deleted entries suggests CoPP is not causing issues.
- C
The routing table has too many prefixes, causing CoPP to drop packets.
Why wrong: The number of prefixes is within limits (1,000,000 active), so no issue.
- D
The routing table is not being updated due to a CoPP policy.
Why wrong: There is no evidence of update failures; the table is stable.
Question 369 of 2,152
How to Check Routing Table Stability Under CoPP
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 route summary IP routing table name: Default-IP-Routing-Table (0x0) IP routing table maximum-paths: 32
Route entry limits: 1000000 active, 2000000 total Number of prefixes: 500 Prefixes with memory: 500 Number of paths: 600 Paths with memory: 600 Number of operations: 1200 Number of deleted entries: 0
What does this output indicate?
Quick Answer
The correct interpretation is that the routing table has 500 prefixes and 600 paths with zero deleted entries, confirming that routing protocols are functioning normally and CoPP is not blocking updates. This output directly reflects routing table stability because a stable table under CoPP shows a consistent prefix count, no accumulating deleted entries, and a healthy path-to-prefix ratio—here, 600 paths for 500 prefixes indicates multipath routing is active without disruption. On the Cisco CCNP ENARSI 300-410 exam, this command tests your ability to distinguish between CoPP dropping control-plane traffic versus normal routing behavior; a common trap is assuming a high number of operations (1,200) signals a problem, but operations simply track incremental changes over time, not instability. The key insight is that CoPP blocks packets at the control plane, so if it were interfering, you would see a declining prefix count or rising deleted entries as routes time out. Memory tip: “500 prefixes, zero deletes—CoPP is not the threat.”
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
✓
The routing table has 500 prefixes, indicating that routing protocols are functioning and CoPP is not blocking updates.
The output shows 500 prefixes and 600 paths in the routing table, which indicates that routing protocols are exchanging routes and the routing table is being populated normally. Since CoPP is designed to protect the control plane by rate-limiting or dropping excessive traffic, a healthy routing table with a typical number of prefixes suggests that CoPP is not blocking routing updates. Therefore, option B is correct.
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.
- ✗
The routing table is empty due to CoPP dropping routing updates.
Why it's wrong here
The output shows 500 prefixes, so the routing table is populated.
- ✓
The routing table has 500 prefixes, indicating that routing protocols are functioning and CoPP is not blocking updates.
Why this is correct
A healthy routing table with no deleted entries suggests CoPP is not causing issues.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The routing table has too many prefixes, causing CoPP to drop packets.
Why it's wrong here
The number of prefixes is within limits (1,000,000 active), so no issue.
- ✗
The routing table is not being updated due to a CoPP policy.
Why it's wrong here
There is no evidence of update failures; the table is stable.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that a low or moderate number of prefixes automatically indicates CoPP is dropping updates, when in fact CoPP would cause routing table instability or missing routes, not a static but healthy prefix count.
Trap categories for this question
Command / output trap
The output shows 500 prefixes, so the routing table is populated.
Detailed technical explanation
How to think about this question
The 'show ip route summary' command displays the total number of prefixes and paths in the RIB (Routing Information Base), which reflects the cumulative result of all routing protocols (e.g., OSPF, EIGRP, BGP) and static routes. CoPP operates by applying a QoS policy to traffic destined to the control plane, such as routing protocol packets (e.g., OSPF hello, BGP updates), and can drop or police them if they exceed configured rates. A stable prefix count indicates that CoPP is not interfering with these critical control plane packets, as any significant drop would cause route flapping or incomplete tables.
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 practitioner preparing for the 300-410 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
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: The routing table has 500 prefixes, indicating that routing protocols are functioning and CoPP is not blocking updates. — The output shows 500 prefixes and 600 paths in the routing table, which indicates that routing protocols are exchanging routes and the routing table is being populated normally. Since CoPP is designed to protect the control plane by rate-limiting or dropping excessive traffic, a healthy routing table with a typical number of prefixes suggests that CoPP is not blocking routing updates. Therefore, option B is correct.
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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