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.”
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 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
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 command shows the IP routing table summary. It indicates that there are 500 prefixes and 600 paths in the routing table, with no deleted entries. This can be used to verify that CoPP is not affecting routing updates by checking if the routing table is stable.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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
Static NAT maps one inside address to one outside address.
✗
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: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
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
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 300-410 question in full detail.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 300-410 NAT questions on configuration and troubleshooting.
Control Plane Policing (CoPP) — This question tests Control Plane Policing (CoPP) — Static NAT maps one inside address to one outside address..
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 command shows the IP routing table summary. It indicates that there are 500 prefixes and 600 paths in the routing table, with no deleted entries. This can be used to verify that CoPP is not affecting routing updates by checking if the routing table is stable.
What should I do if I get this 300-410 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 300-410 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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