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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 110 IP packet debugging is on for access list 110 *Mar 1 00:15:22.345: IP: s=10.1.1.1 (GigabitEthernet0/0), d=10.2.2.2, len 100, proto TCP, flags 0x2, sport 12345, dport 23, access list 110: matched line 10 deny tcp host 10.1.1.1 host 10.2.2.2 eq 23 *Mar 1 00:15:22.346: IP: s=10.1.1.1 (GigabitEthernet0/0), d=10.2.2.2, len 100, proto TCP, flags 0x10, sport 12345, dport 23, access list 110: matched line 10 deny tcp host 10.1.1.1 host 10.2.2.2 eq 23
What does this output indicate?
⚠ Common exam trap
The trap here is that candidates may misinterpret the 'matched line 10 deny' as a permit action or assume the ACL is applied outbound based on the source interface, but the debug only shows the packet's ingress interface and the ACL match result, not the ACL's application direction.
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
✓
Telnet traffic from 10.1.1.1 to 10.2.2.2 is being denied by ACL 110.
The debug output shows packets with source IP 10.1.1.1 and destination IP 10.2.2.2, protocol TCP, destination port 23 (Telnet), and the log explicitly states 'matched line 10 deny tcp host 10.1.1.1 host 10.2.2.2 eq 23'. This confirms that ACL 110 is denying Telnet traffic from 10.1.1.1 to 10.2.2.2. The flags 0x2 (SYN) and 0x10 (ACK) indicate the initial and subsequent packets of the Telnet session are both being denied.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Telnet traffic from 10.1.1.1 to 10.2.2.2 is being denied by ACL 110.
Why this is correct
The debug shows the packets match the deny line.
- ✗
Telnet traffic from 10.1.1.1 to 10.2.2.2 is being permitted by ACL 110.
Why it's wrong here
The match is on a deny line.
- ✗
ACL 110 is applied outbound on GigabitEthernet0/0.
Why it's wrong here
The debug does not show direction; it only shows the interface where the packet was seen.
- ✗
ACL 110 has no line 10.
Why it's wrong here
The debug shows line 10.
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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.