Quick Answer
The answer is untrusted. By default, all interfaces on a Cisco device are assigned the role of untrusted for IPv6 Neighbor Discovery Inspection when no policy is explicitly applied, meaning every incoming ND message on that interface is subject to strict validation checks such as source address verification and reachability testing. This default behavior ensures that no interface is implicitly trusted, forcing the network administrator to consciously designate trusted ports only after verifying the security posture of connected devices. On the Cisco CCNP ENARSI 300-410 exam, this concept tests your understanding of IPv6 First Hop Security fundamentals, often appearing as a straightforward question that traps candidates into assuming a management or uplink interface would be trusted by default. A common memory tip is to think of the word “untrusted” as the default state for all interfaces in ND inspection, just like a locked door that requires a key to open—nothing is trusted until you explicitly apply the “ipv6 nd inspection trust” command.
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.
What is the default role of an interface in IPv6 Neighbor Discovery Inspection when no policy is explicitly applied?
Untrusted
The default role is untrusted, so ND messages are inspected.
Trusted
Why wrong: Trusted is not the default; it must be configured.
Server
Why wrong: Server is a role for DHCP guard, not ND inspection.
Host
Why wrong: Host is a role that can be configured, but not default.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Untrusted
By default, all interfaces are considered untrusted for ND inspection, meaning they are subject to validation checks unless explicitly trusted.
Key principle: OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Untrusted
Why this is correct
The default role is untrusted, so ND messages are inspected.
Related concept
OSPF neighbours must agree on key parameters.
Trusted
Why it's wrong here
Trusted is not the default; it must be configured.
Server
Why it's wrong here
Server is a role for DHCP guard, not ND inspection.
Host
Why it's wrong here
Host is a role that can be configured, but not default.
Common exam traps
OSPF neighbour formation depends on matching areas, timers, network type, authentication and passive-interface behaviour. Do not choose an answer only because the devices can ping.
Detailed technical explanation
OSPF questions usually test the details that control adjacency and route selection. Read the neighbour state, area, router ID and interface configuration before deciding what is wrong.
Key takeaway
OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
Real-world example
A network engineer at a university connects two campus buildings via a fibre link. Both routers run OSPF, but no adjacency forms — even though both routers can ping each other. The engineer finds one router is in area 0 and the other in area 1. OSPF adjacency requires matching area numbers, hello/dead timers, and network type. IP reachability alone is not enough.
What to study next
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related 300-410 OSPF questions on adjacency and route selection.
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FAQ
IPv6 First Hop Security — This question tests IPv6 First Hop Security — OSPF neighbours must agree on key parameters..
The correct answer is: Untrusted — By default, all interfaces are considered untrusted for ND inspection, meaning they are subject to validation checks unless explicitly trusted.
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related 300-410 OSPF questions on adjacency and route selection.
OSPF neighbours must agree on key parameters.
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Last reviewed: Jun 18, 2026
This 300-410 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 300-410 exam.
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