300-410 IPv6 Traffic Filtering and uRPF Practice Question
This 300-410 practice question tests your understanding of ipv6 traffic filtering and urpf. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
In IPv6, what is the default action for an access-list entry that does not specify a protocol?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The ACE is invalid and ignored.
IPv6 ACLs require a protocol keyword (e.g., tcp, udp, icmp, ipv6). If omitted, the ACE is invalid and ignored.
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.
✗
The ACE defaults to 'permit ipv6'.
Why it's wrong here
There is no default protocol; the ACE must explicitly specify a protocol.
✓
The ACE is invalid and ignored.
Why this is correct
Cisco IOS requires a protocol in each IPv6 ACL entry; without it, the entry is invalid.
Related concept
Standard ACLs match source addresses.
✗
The ACE defaults to 'deny ipv6'.
Why it's wrong here
No default protocol is assumed; the entry is simply invalid.
✗
The ACE matches all IPv6 traffic.
Why it's wrong here
Only the 'ipv6' keyword matches all IPv6 traffic; omitting the protocol makes the entry invalid.
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
Keyword trap
Only the 'ipv6' keyword matches all IPv6 traffic; omitting the protocol makes the entry invalid.
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: The ACE is invalid and ignored. — IPv6 ACLs require a protocol keyword (e.g., tcp, udp, icmp, ipv6). If omitted, the ACE is invalid and ignored.
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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