300-410 IPv4 Access Control Lists Practice Question
This 300-410 practice question tests your understanding of ipv4 access control lists. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
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
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.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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
The output shows the ACL is outbound and its entries.
Related concept
Read the scenario before looking for a memorised answer.
✗
ACL 102 is applied inbound on GigabitEthernet0/0, blocking Telnet.
ACL 102 is applied inbound and outbound on GigabitEthernet0/0.
Why it's wrong here
Only outbound is set.
Common exam traps
Common exam trap: answer the scenario, not the keyword
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.
Trap categories for this question
Command / output trap
The output says 'Outgoing access list is 102'.
Detailed technical explanation
How to think about this question
When an ACL is applied outbound, the router evaluates packets after the routing decision is made, just before they exit the interface. The 'show ip interface' command is the definitive way to verify ACL direction and interface binding, while 'show ip access-lists' only displays the ACL content without interface association. In real-world scenarios, misapplying an ACL direction is a common cause of troubleshooting issues, as outbound ACLs do not affect traffic entering the interface.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A security administrator must allow nursing staff to reach a patient records server while blocking access from the guest Wi-Fi VLAN. After applying an extended ACL, traffic is still blocked from nursing workstations. The ACL was applied outbound instead of inbound on the wrong interface. Questions like this test ACL direction and placement rules.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 300-410 question in full detail.
IPv4 Access Control Lists — This question tests IPv4 Access Control Lists — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: 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.
What should I do if I get this 300-410 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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