mediumMultiple ChoiceObjective-mapped
300-410 Practice Question: Runs the following command to troubleshoot a…
A network engineer runs the following command to troubleshoot a Route Summarization issue:
R1# show ip access-lists CoPP-ACL
extended IP access list CoPP-ACL
10 permit eigrp any any (100 matches)
20 permit ospf any any (50 matches)
30 permit bgp any any (200 matches)
40 deny ip any any (0 matches)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
✓
CoPP is permitting routing protocol traffic, including EIGRP, OSPF, and BGP, which are used for route summarization. No drops indicate CoPP is not blocking summarization.
This output shows an access list used for Control Plane Policing (CoPP). The match counts indicate that EIGRP, OSPF, and BGP traffic are being permitted. The absence of matches on the deny statement suggests that no traffic is being dropped, which could indicate that CoPP is not affecting route summarization traffic.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
CoPP is permitting routing protocol traffic, including EIGRP, OSPF, and BGP, which are used for route summarization. No drops indicate CoPP is not blocking summarization.
Why this is correct
The permit statements with matches show that routing protocol traffic is allowed, and no drops mean CoPP is not interfering.
- ✗
CoPP is dropping all routing protocol traffic, preventing route summarization.
Why it's wrong here
The deny statement has 0 matches, so no traffic is being dropped.
- ✗
CoPP is only allowing BGP traffic, blocking EIGRP and OSPF summarization.
Why it's wrong here
All three protocols have matches, indicating they are permitted.
- ✗
CoPP is not configured because the access list is empty.
Why it's wrong here
The access list has entries with matches.
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.
Go deeper
Related to this question
Learn chapter
Introduction to ENARSI Exam and Network Fundamentals
Key term
Control Plane Policing
Control Plane Policing is a Cisco security feature that protects a router or switch by rate-limiting the traffic that the device's processor must handle, preventing it from being overwhelmed.
Key term
BGP Route Aggregation
BGP Route Aggregation is a technique that combines multiple specific network routes into a single summary route to reduce the size of routing tables and improve network efficiency.
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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.