mediumMultiple ChoiceObjective-mapped
300-410 Practice Question: Runs the following command to troubleshoot an…
A network engineer runs the following command to troubleshoot an IPv4 Access Control Lists issue:
R1# debug ip packet 150 IP packet debugging is on for access list 150 *Mar 1 00:25:45.678: IP: s=192.168.1.1 (GigabitEthernet0/0), d=10.1.1.1, len 100, proto UDP, flags 0x0, sport 12345, dport 53, access list 150: matched line 10 permit udp host 192.168.1.1 host 10.1.1.1 eq 53 *Mar 1 00:25:45.679: IP: s=192.168.1.1 (GigabitEthernet0/0), d=10.1.1.1, len 100, proto TCP, flags 0x2, sport 12346, dport 53, access list 150: matched line 20 permit tcp host 192.168.1.1 host 10.1.1.1 eq 53
What does this output indicate?
⚠ Common exam trap
Cisco often tests the misconception that 'debug ip packet' output shows only denied packets, but it actually shows all packets that match the ACL, whether permitted or denied, and the 'permit' or 'deny' keyword in the matched line is what determines the action.
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
✓
DNS traffic from 192.168.1.1 to 10.1.1.1 is being permitted by ACL 150.
The debug output shows that packets from source 192.168.1.1 to destination 10.1.1.1 with destination port 53 (DNS) are matching permit statements in ACL 150 (line 10 for UDP and line 20 for TCP). Since the ACL is permitting these packets, DNS traffic is allowed through the interface where the ACL is applied.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
DNS traffic from 192.168.1.1 to 10.1.1.1 is being permitted by ACL 150.
Why this is correct
Both UDP and TCP DNS packets match permit lines.
- ✗
DNS traffic from 192.168.1.1 to 10.1.1.1 is being denied by ACL 150.
Why it's wrong here
The matches are on permit lines.
- ✗
ACL 150 is applied outbound on GigabitEthernet0/0.
Why it's wrong here
Direction is not shown.
- ✗
ACL 150 has no line 10 or 20.
Why it's wrong here
The debug shows those lines.
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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.