- A
Create the ACL using the ipv6 access-list command.
Correct: 'ipv6 access-list NAME' enters IPv6 ACL configuration mode.
- B
Apply the ACL to the interface using the ipv6 traffic-filter command.
Correct: 'ipv6 traffic-filter NAME in' or 'out' applies the ACL.
- C
Create the ACL using the access-list command.
Why wrong: The 'access-list' command is for IPv4, not IPv6.
- D
Apply the ACL to the interface using the ip access-group command.
Why wrong: The 'ip access-group' command is for IPv4 ACLs.
- E
Apply the ACL to the interface using the ipv6 access-group command.
Why wrong: There is no 'ipv6 access-group' command; the correct command is 'ipv6 traffic-filter'.
Question 1,567 of 2,152
IPv6 Traffic Filtering ACL Configuration — Step-by-Step
This 300-410 practice question tests your understanding of ipv6 traffic filtering and urpf. 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 implement IPv6 traffic filtering using a named ACL on a Cisco router? (Choose TWO.)
Quick Answer
The correct answer is that you must apply the ACL to the interface using the ipv6 traffic-filter command. This is required because IPv6 traffic filtering on a Cisco router follows a two-step process: first, you create the named ACL using the ipv6 access-list command to define permit or deny statements for IPv6 traffic, and second, you activate that filter on a specific interface with the ipv6 traffic-filter command in interface configuration mode. On the Cisco CCNP ENARSI 300-410 exam, this distinction is frequently tested to separate IPv6 ACL configuration from its IPv4 counterpart, where the commands are access-list and ip access-group, respectively. A common trap is confusing ipv6 traffic-filter with the nonexistent ipv6 access-group or using the IPv4 access-list command for IPv6 traffic. To remember the correct syntax, think of the mnemonic “Six-Filter” — for IPv6, you always use ipv6 traffic-filter, not ip access-group.
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
✓
Create the ACL using the ipv6 access-list command.
Option A is correct because the `ipv6 access-list` command is the standard Cisco IOS command used to create a named IPv6 ACL, which supports filtering based on IPv6 headers, extension headers, and upper-layer protocols. Option B is correct because the `ipv6 traffic-filter` command is the interface-level command that applies the named IPv6 ACL to filter inbound or outbound IPv6 traffic, analogous to `ip access-group` for IPv4.
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.
- ✓
Create the ACL using the ipv6 access-list command.
Why this is correct
Correct: 'ipv6 access-list NAME' enters IPv6 ACL configuration mode.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Apply the ACL to the interface using the ipv6 traffic-filter command.
Why this is correct
Correct: 'ipv6 traffic-filter NAME in' or 'out' applies the ACL.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Create the ACL using the access-list command.
Why it's wrong here
The 'access-list' command is for IPv4, not IPv6.
- ✗
Apply the ACL to the interface using the ip access-group command.
Why it's wrong here
The 'ip access-group' command is for IPv4 ACLs.
- ✗
Apply the ACL to the interface using the ipv6 access-group command.
Why it's wrong here
There is no 'ipv6 access-group' command; the correct command is 'ipv6 traffic-filter'.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between IPv4 and IPv6 ACL commands, and the trap here is that candidates mistakenly apply the IPv4 `ip access-group` command or the non-existent `ipv6 access-group` command instead of the correct `ipv6 traffic-filter` command.
Trap categories for this question
Command / output trap
The 'access-list' command is for IPv4, not IPv6.
Detailed technical explanation
How to think about this question
IPv6 ACLs operate on the IPv6 header fields such as source/destination address, traffic class, flow label, and next header (which identifies the upper-layer protocol like TCP, UDP, or ICMPv6). Unlike IPv4 ACLs, IPv6 ACLs also support implicit permit rules for neighbor discovery (ICMPv6 types 133–137) and implicit deny all at the end, which is critical for proper IPv6 network operation. In real-world deployments, forgetting to apply the `ipv6 traffic-filter` command on the correct interface direction can lead to unintended traffic drops or security gaps.
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.
Visual reference
What to study next
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IPv6 Traffic Filtering and uRPF — study guide chapter
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FAQ
Questions learners often ask
What does this 300-410 question test?
IPv6 Traffic Filtering and uRPF — This question tests IPv6 Traffic Filtering and uRPF — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Create the ACL using the ipv6 access-list command. — Option A is correct because the `ipv6 access-list` command is the standard Cisco IOS command used to create a named IPv6 ACL, which supports filtering based on IPv6 headers, extension headers, and upper-layer protocols. Option B is correct because the `ipv6 traffic-filter` command is the interface-level command that applies the named IPv6 ACL to filter inbound or outbound IPv6 traffic, analogous to `ip access-group` for IPv4.
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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Last reviewed: Jul 4, 2026
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