Question 820 of 2,152

IPv6 First Hop Security →hardMultiple SelectObjective-mapped

300-410 IPv6 First Hop Security Practice Question

This 300-410 practice question tests your understanding of ipv6 first hop security. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 statements about IPv6 First Hop Security (FHS) RA Guard are true? (Choose TWO.)

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.

Question 1hardmulti select

Study the full IPv6 explanation →

A
The default RA Guard policy action is to block Router Advertisements from unauthorized ports.
Correct. The default action for an RA Guard policy is 'block', which drops unauthorized RAs.
B
RA Guard validates the source MAC address of Router Advertisements against the IPv6 source address.
Why wrong: Incorrect. RA Guard does not perform source MAC validation; it checks router preference and hop limit fields.
C
The default RA Guard policy action is to log Router Advertisements from unauthorized ports.
Why wrong: Incorrect. The default action is 'block', not 'log'. Logging can be configured separately.
D
RA Guard can be applied on a per-interface or per-VLAN basis using a policy map.
Correct. RA Guard policies are applied using a policy map that can be attached to an interface or a VLAN.
E
RA Guard is typically enabled on trunk ports to protect against rogue RAs from other VLANs.
Why wrong: Incorrect. RA Guard is usually applied on access ports; trunk ports often need to forward legitimate RAs.

Full breakdown with real-world context →

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

✓

The default RA Guard policy action is to block Router Advertisements from unauthorized ports.

RA Guard is a feature that blocks unauthorized Router Advertisement messages. It relies on policy enforcement based on port and VLAN, not on source MAC or a trust boundary per se. The default policy action is 'block', and the feature can be applied globally or per interface. Option A is correct because the default action is to block RAs from unauthorized ports. Option D is correct because RA Guard operates on Layer 2 interfaces and can be applied to a range of VLANs. Option B is incorrect because the feature does not validate source MAC; it checks the router preference and hop limit. Option C is incorrect because the default policy action is 'block', not 'log'. Option E is incorrect because RA Guard is typically applied on access ports, not trunk ports, and trunk ports often carry multiple VLANs where RA Guard might interfere with legitimate routers.

Key principle: A trunk being up does not mean the VLAN is allowed across it. Always verify the allowed VLAN list and whether the VLAN exists on both switches.

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 default RA Guard policy action is to block Router Advertisements from unauthorized ports.
Why this is correct
Correct. The default action for an RA Guard policy is 'block', which drops unauthorized RAs.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Access ports place end devices into a single VLAN.
✗
RA Guard validates the source MAC address of Router Advertisements against the IPv6 source address.
Why it's wrong here
Incorrect. RA Guard does not perform source MAC validation; it checks router preference and hop limit fields.
✗
The default RA Guard policy action is to log Router Advertisements from unauthorized ports.
Why it's wrong here
Incorrect. The default action is 'block', not 'log'. Logging can be configured separately.
✓
RA Guard can be applied on a per-interface or per-VLAN basis using a policy map.
Why this is correct
Correct. RA Guard policies are applied using a policy map that can be attached to an interface or a VLAN.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Access ports place end devices into a single VLAN.
✗
RA Guard is typically enabled on trunk ports to protect against rogue RAs from other VLANs.
Why it's wrong here
Incorrect. RA Guard is usually applied on access ports; trunk ports often need to forward legitimate RAs.

Common exam traps

Common exam trap: an active trunk can still block the VLAN you need

A trunk being up does not prove every VLAN is crossing it. Check allowed VLAN lists, native VLAN mismatch, VLAN existence and access-port assignment.

Detailed technical explanation

How to think about this question

VLAN questions usually combine access-port and trunking clues. The key is to identify whether the issue is local to one switchport, caused by the trunk, or caused by the VLAN not existing where it needs to exist.

KKey Concepts to Remember

Access ports place end devices into a single VLAN.
Trunk ports carry multiple VLANs between switches.
Allowed VLAN lists decide which VLANs can cross a trunk.
Native VLAN mismatch can create confusing symptoms.

TExam Day Tips

Use show vlan brief to verify access VLANs.
Use show interfaces trunk to verify trunk state and allowed VLANs.
Do not treat every same-VLAN issue as a routing problem.

Key takeaway

A trunk being up does not mean the VLAN is allowed across it. Always verify the allowed VLAN list and whether the VLAN exists on both switches.

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.

What to study next

Got this wrong? Here's your next step.

Review VLAN allowed lists, native VLAN mismatch detection, and how to verify VLAN membership with show vlan brief and show interfaces trunk. Then practise related 300-410 questions on switching, trunking, and access-port configuration.

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FAQ

Questions learners often ask

What does this 300-410 question test?

IPv6 First Hop Security — This question tests IPv6 First Hop Security — Access ports place end devices into a single VLAN..

What is the correct answer to this question?

The correct answer is: The default RA Guard policy action is to block Router Advertisements from unauthorized ports. — RA Guard is a feature that blocks unauthorized Router Advertisement messages. It relies on policy enforcement based on port and VLAN, not on source MAC or a trust boundary per se. The default policy action is 'block', and the feature can be applied globally or per interface. Option A is correct because the default action is to block RAs from unauthorized ports. Option D is correct because RA Guard operates on Layer 2 interfaces and can be applied to a range of VLANs. Option B is incorrect because the feature does not validate source MAC; it checks the router preference and hop limit. Option C is incorrect because the default policy action is 'block', not 'log'. Option E is incorrect because RA Guard is typically applied on access ports, not trunk ports, and trunk ports often carry multiple VLANs where RA Guard might interfere with legitimate routers.

What should I do if I get this 300-410 question wrong?

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?

Access ports place end devices into a single VLAN.

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