mediumMultiple ChoiceObjective-mapped
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 access-lists CoPP-ACL
Extended IP access list CoPP-ACL
10 permit tcp host 10.1.1.1 any eq bgp (100 matches)
20 permit udp any any eq 67 (50 matches)
30 permit icmp any any echo (200 matches)
40 deny ip any any (500 matches)What does this output indicate?
⚠ Common exam trap
Cisco often tests the ability to interpret ACL match counts to determine actual traffic behavior, leading candidates to mistakenly think a deny all at the end means all traffic is dropped, when in fact the permit lines above it are allowing specific traffic.
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 ACL is permitting DHCP and ICMP echo traffic, but dropping all other traffic.
The ACL shows that lines 10, 20, and 30 have match counts, indicating that BGP from 10.1.1.1, DHCP (UDP port 67), and ICMP echo are being permitted. Line 40 is a deny all with 500 matches, meaning all other traffic is being dropped. This confirms that the ACL is permitting only the specified traffic (DHCP and ICMP echo) while dropping everything else, making option B 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 ACL is blocking all BGP traffic from 10.1.1.1.
Why it's wrong here
Line 10 permits BGP traffic from 10.1.1.1, as shown by the matches.
- ✓
The ACL is permitting DHCP and ICMP echo traffic, but dropping all other traffic.
Why this is correct
Lines 20 and 30 permit DHCP and ICMP echo, while line 40 denies everything else, which is typical for CoPP to protect the control plane.
- ✗
The ACL is applied to the control plane interface and is dropping all traffic.
Why it's wrong here
Only traffic not matching lines 10-30 is dropped; permitted traffic is forwarded.
- ✗
The ACL has a misconfiguration because the deny statement should be at the top.
Why it's wrong here
The order is correct; permit statements come before the deny all to allow specific traffic.
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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.