300-410 IPv4 Access Control Lists Practice Question
This 300-410 practice question tests your understanding of ipv4 access control lists. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
Which TWO configuration steps are required to apply an IPv4 extended access list to an interface in Cisco IOS? (Choose TWO.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure the ACL using access-list or ip access-list commands.
Option A is correct because an IPv4 extended ACL must first be defined using either the numbered `access-list` command or the named `ip access-list extended` command before it can be applied. Option B is correct because the `ip access-group` command is the only way to bind a configured ACL to an interface in Cisco IOS, specifying the direction (in or out) and optionally the VLAN filter.
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.
✓
Configure the ACL using access-list or ip access-list commands.
Why this is correct
The ACL must be defined first with permit/deny entries.
Related concept
Read the scenario before looking for a memorised answer.
✓
Apply the ACL to the interface with the ip access-group command.
Why this is correct
This command binds the ACL to an interface in the specified direction.
Related concept
Read the scenario before looking for a memorised answer.
✗
Create the ACL directly under the interface configuration mode.
Why it's wrong here
ACLs are created globally, not under interface configuration.
✗
Use the access-class command on the interface.
Why it's wrong here
The 'access-class' command is used on VTY lines, not on interfaces.
✗
Enable the ACL with the ip inspect command.
Why it's wrong here
The 'ip inspect' command is for firewall inspection, not ACL application.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between `ip access-group` (for interfaces) and `access-class` (for VTY lines), leading candidates to mistakenly choose `access-class` when the question specifies an interface.
Trap categories for this question
Command / output trap
The 'access-class' command is used on VTY lines, not on interfaces.
Detailed technical explanation
How to think about this question
Extended ACLs evaluate packets based on source/destination IP, protocol (e.g., TCP, UDP, ICMP), and port numbers, with an implicit deny all at the end. When applied via `ip access-group`, the ACL is processed in hardware on Cisco switches using TCAM for line-rate forwarding, but on routers it is processed in software, which can impact performance if the ACL is large. A common real-world scenario is applying an extended ACL inbound on a WAN interface to filter traffic before it reaches the router's CPU, reducing unnecessary processing.
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 help-desk technician troubleshoots why a newly connected PC cannot reach shared printers on the same floor. The cable is good, the switch port is active, but the PC is in VLAN 20 and the printers are in VLAN 10. The uplink trunk only allows VLAN 10. A trunk being up does not mean every VLAN crosses it.
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: Configure the ACL using access-list or ip access-list commands. — Option A is correct because an IPv4 extended ACL must first be defined using either the numbered `access-list` command or the named `ip access-list extended` command before it can be applied. Option B is correct because the `ip access-group` command is the only way to bind a configured ACL to an interface in Cisco IOS, specifying the direction (in or out) and optionally the VLAN filter.
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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