easyMultiple Choice
300-410 Practice Question: Runs the following command to troubleshoot a…
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?
⚠ Common exam trap
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.
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.
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 lists 500 prefixes and 600 paths, so the table is populated, not empty. It tempts because CoPP can drop routing protocol packets, but that would show missing routes and policy drops, not a summary reporting active entries.
- ✓
The routing table has 500 prefixes, indicating that routing protocols are functioning and CoPP is not blocking updates.
Why this is correct
The summary confirms 500 active prefixes and 600 paths, so routing protocol adjacencies are exchanging updates normally. Because CoPP polices control-plane traffic rather than data-plane forwarding, this healthy prefix count shows route advertisements are not being dropped, satisfying the stem's CoPP troubleshooting constraint.
- ✗
The routing table has too many prefixes, causing CoPP to drop packets.
Why it's wrong here
The summary shows 500 prefixes against a 1,000,000 active limit, so no exhaustion exists and CoPP is unrelated to route-table contents. It tempts because CoPP drops control-plane traffic, but verifying CoPP requires policy counters, not route counts.
- ✗
The routing table is not being updated due to a CoPP policy.
Why it's wrong here
Zero deleted entries and populated prefix counts indicate normal table operation; CoPP status cannot be inferred from route summary output. It tempts because CoPP protects the control plane, but confirming drops needs show policy-map control-plane counters.
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.