easyMultiple Choice
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# show ip interface GigabitEthernet0/0 | include access list
Outgoing access list is 102 Inbound access list is not set
Then the engineer checks:
R1# show ip access-lists 102
Extended IP access list 102
10 deny tcp any any eq 23
20 permit ip any anyWhat does this output indicate?
⚠ Common exam trap
Cisco often tests the distinction between the ACL being 'applied' to an interface versus the ACL's content, and the trap here is that candidates see the ACL content and assume it is applied inbound without checking the interface output for 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
✓
ACL 102 is applied outbound on GigabitEthernet0/0, denying Telnet traffic and permitting all other traffic.
The output of 'show ip interface GigabitEthernet0/0 | include access list' shows 'Outgoing access list is 102', which means ACL 102 is applied in the outbound direction on that interface. The ACL itself contains a deny statement for TCP traffic destined to port 23 (Telnet) followed by a permit ip any any, so it denies Telnet traffic while permitting all other IP traffic. Option A correctly summarizes this behavior.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
ACL 102 is applied outbound on GigabitEthernet0/0, denying Telnet traffic and permitting all other traffic.
Why this is correct
ACL 102 filters traffic leaving GigabitEthernet0/0, satisfying the outbound direction shown by "Outgoing access list is 102". Sequence 10 drops TCP port 23 (Telnet) to any destination, while sequence 20 permits all remaining IP traffic, so only Telnet egress is blocked and everything else forwards.
- ✗
ACL 102 is applied inbound on GigabitEthernet0/0, blocking Telnet.
Why it's wrong here
The output states "Inbound access list is not set", so ACL 102 filters outbound traffic only; Telnet from the LAN is unaffected. It tempts because ACL 102 denies tcp any any eq 23, and inbound application would block Telnet, but the interface line contradicts that reading.
- ✗
ACL 102 is not applied to any interface.
Why it's wrong here
The interface output explicitly reports "Outgoing access list is 102", so the ACL is bound to GigabitEthernet0/0 outbound. It tempts because the ACL exists and could sit unassigned, but the show ip interface line proves an active binding.
- ✗
ACL 102 is applied inbound and outbound on GigabitEthernet0/0.
Why it's wrong here
The interface output states the outgoing access list is 102 while the inbound list is not set, so the ACL filters only traffic leaving GigabitEthernet0/0. It is not applied inbound. Reading both lines as active misinterprets the explicit 'not set' inbound entry.
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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.