mediumMultiple ChoiceObjective-mapped
300-410 Practice Question: Consider the following partial configuration:…
Consider the following partial configuration:
ipv6 nd inspection policy ND_INSPECT device-role host trusted-port
interface GigabitEthernet0/4
ipv6 nd inspection policy ND_INSPECT
What is the effect of the 'trusted-port' command in this policy?
⚠ Common exam trap
Cisco often tests the misconception that 'trusted-port' means the interface is 'trusted to send only valid ND messages' or that it performs some filtering, when in reality it simply disables all ND inspection on that interface.
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 is trusted, so Neighbor Discovery messages are not inspected.
The 'trusted-port' command under the IPv6 ND inspection policy configures the interface to be a trusted port. On a trusted port, Neighbor Discovery (ND) messages are not inspected or rate-limited; they are simply forwarded without validation against the IPv6 neighbor binding table. This is correct because the device-role host setting combined with trusted-port means the interface is considered a legitimate source of ND messages, so no inspection is performed.
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 is trusted, so Neighbor Discovery messages are not inspected.
Why this is correct
Trusted ports bypass ND inspection checks.
- ✗
The interface only allows Neighbor Advertisements from trusted sources.
Why it's wrong here
Trusted ports allow all ND messages without inspection.
- ✗
The interface drops all Neighbor Discovery messages.
Why it's wrong here
Trusted ports do not drop ND messages.
- ✗
The interface requires a valid binding for each ND message.
Why it's wrong here
That is the behavior for untrusted ports.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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