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300-410 Practice Question: Interface GigabitEthernet0/1 is configured as…
Interface GigabitEthernet0/1 is configured as shown: interface GigabitEthernet0/1
ipv6 address 2001:db8:1::1/64 ipv6 nd raguard ipv6 nd prefix default no-autoconfig
What is the effect of this configuration?
⚠ Common exam trap
Cisco often tests the distinction between commands that affect outgoing RAs (like `ipv6 nd prefix default no-autoconfig`) versus those that filter incoming RAs (like `ipv6 nd raguard`), leading candidates to confuse the direction of the traffic being controlled.
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 interface drops all incoming Router Advertisements from other routers.
The `ipv6 nd raguard` command enables Router Advertisement (RA) guard on the interface, which drops all incoming RAs from other routers to prevent rogue RA attacks. The `ipv6 nd prefix default no-autoconfig` command suppresses the autonomous flag in sent RAs, but the RA guard is the active security feature that blocks incoming RAs, making option A correct.
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 drops all incoming Router Advertisements from other routers.
Why this is correct
The 'ipv6 nd raguard' command blocks RAs received on this interface, enforcing first-hop security.
- ✗
The interface sends RAs with the autonomous flag set to allow SLAAC.
Why it's wrong here
The 'no-autoconfig' keyword actually clears the autonomous flag, preventing SLAAC.
- ✗
The interface only allows RAs from a specific authorized router.
Why it's wrong here
RA guard blocks all RAs, not selectively allowing any.
- ✗
The interface drops all Neighbor Solicitations.
Why it's wrong here
RA guard only filters Router Advertisements, not Neighbor Solicitations.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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