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.
300-410 IPv6 Traffic Filtering and uRPF Practice Question
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.)
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.
You must first create the ACL with 'ipv6 access-list' and then apply it to an interface with 'ipv6 traffic-filter'. The 'access-list' command is for IPv4, 'ip access-group' is for IPv4 ACL application, and 'ipv6 access-group' does not exist.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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.
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: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
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
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
Standard ACLs match source addresses.
Extended ACLs can match source, destination, protocol and ports.
The first matching ACL entry is used.
There is usually an implicit deny at the end.
TExam Day Tips
→Check inbound versus outbound direction.
→Read the ACL from top to bottom.
→Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related 300-410 ACL questions on filtering logic and placement.
IPv6 Traffic Filtering and uRPF — This question tests IPv6 Traffic Filtering and uRPF — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Create the ACL using the ipv6 access-list command. — You must first create the ACL with 'ipv6 access-list' and then apply it to an interface with 'ipv6 traffic-filter'. The 'access-list' command is for IPv4, 'ip access-group' is for IPv4 ACL application, and 'ipv6 access-group' does not exist.
What should I do if I get this 300-410 question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related 300-410 ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
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Question Discussion
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