This 300-410 practice question tests your understanding of ipv6 first hop security. 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 configuration is missing to properly implement IPv6 First Hop Security on an access switch port that should only allow traffic from a single host with a static IPv6 address 2001:db8:1::10?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The interface needs 'ipv6 verify source' and a static binding entry 'ipv6 source binding 2001:db8:1::10 interface GigabitEthernet0/6'.
To restrict traffic to a single host, you need IPv6 Source Guard with a static binding or a PACL. The missing piece is often the static binding or the source guard configuration.
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 interface needs 'ipv6 verify source' and a static binding entry 'ipv6 source binding 2001:db8:1::10 interface GigabitEthernet0/6'.
Why this is correct
IPv6 Source Guard with a static binding ensures only that source address is allowed.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Standard ACLs match source addresses.
✗
The interface needs 'ipv6 nd raguard' to block RAs.
Why it's wrong here
RA guard blocks RAs, not all traffic from other hosts.
✗
The interface needs 'ipv6 dhcp guard' to block DHCP messages.
Why it's wrong here
DHCP guard only filters DHCP, not all IPv6 traffic.
✗
The interface needs 'ipv6 nd inspection' to validate ND messages.
Why it's wrong here
ND inspection validates ND, but does not restrict all traffic to a single host.
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.
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 First Hop Security — This question tests IPv6 First Hop Security — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: The interface needs 'ipv6 verify source' and a static binding entry 'ipv6 source binding 2001:db8:1::10 interface GigabitEthernet0/6'. — To restrict traffic to a single host, you need IPv6 Source Guard with a static binding or a PACL. The missing piece is often the static binding or the source guard configuration.
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.
Are there clue words in this question I should notice?
Yes — watch for: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
What is the key concept behind this question?
Standard ACLs match source addresses.
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Question Discussion
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