CCNA Network Infrastructure and Connectivity Practice Question
This 200-301 practice question tests your understanding of network infrastructure and connectivity. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. A key principle to apply: neighbor Discovery Protocol enables IPv6 devices to discover other devices and their link-layer addresses on the same local network segment.. 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 statement best describes the purpose of Neighbor Discovery in IPv6 at a CCNA level?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
It supports important local-link IPv6 functions such as neighbor discovery and local reachability behavior.
Neighbor Discovery supports key local-link IPv6 functions such as learning neighbor reachability and mapping Layer 3 information to local Layer 2 delivery. In practical terms, it helps IPv6 hosts and routers discover one another on the local segment and communicate correctly without relying on the exact same mechanisms used by IPv4.
At CCNA level, the main idea is to recognize it as a core local IPv6 function rather than a routing protocol or a wireless feature.
Key principle: Neighbor Discovery Protocol enables IPv6 devices to discover other devices and their link-layer addresses on the same local network segment.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
It supports important local-link IPv6 functions such as neighbor discovery and local reachability behavior.
Why this is correct
This is correct because Neighbor Discovery is a foundational IPv6 local-link mechanism.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Neighbor Discovery Protocol enables IPv6 devices to discover other devices and their link-layer addresses on the same local network segment.
✗
It is the protocol used to summarize routes between OSPF areas.
Why it's wrong here
This is wrong because Neighbor Discovery is not a route summarization mechanism.
When this WOULD be correct
If the exam question asked about OSPF functionalities, specifically regarding inter-area route summarization or the role of OSPF in managing routing information between different areas, then option B would be the correct answer.
✗
It is a wireless security standard replacing WPA3.
Why it's wrong here
This is wrong because Neighbor Discovery is not a WLAN security protocol.
When this WOULD be correct
If the exam question asked about wireless security protocols and their evolution, specifically in the context of replacing older standards, then option C could be correct as it would refer to the role of WPA3 in enhancing wireless security.
✗
It is the SNMP method for polling interface counters.
Why it's wrong here
This is wrong because SNMP polling and IPv6 Neighbor Discovery are different technologies.
When this WOULD be correct
If the question were about SNMP and its methods for monitoring network devices, asking specifically about how to poll interface counters, then option D would be the correct answer as it directly relates to SNMP functionality.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The 200-301 exam frequently reuses these exact scenarios with slightly different constraints.
✓It supports important local-link IPv6 functions such as neighbor discovery and local reachability behavior.Correct answer▾
Why this is correct
This is correct because Neighbor Discovery is a foundational IPv6 local-link mechanism.
✗It is the protocol used to summarize routes between OSPF areas.Wrong answer — click to see why▾
Why this is wrong here
Option B is incorrect because Neighbor Discovery is not related to OSPF route summarization; it focuses on local-link functions in IPv6, such as address resolution and neighbor reachability.
★ When this WOULD be the correct answer
If the exam question asked about OSPF functionalities, specifically regarding inter-area route summarization or the role of OSPF in managing routing information between different areas, then option B would be the correct answer.
Why candidates choose this
Candidates may choose this option due to a misunderstanding of routing protocols and their functions, confusing Neighbor Discovery with OSPF's capabilities in managing and summarizing routing information.
✗It is a wireless security standard replacing WPA3.Wrong answer — click to see why▾
Why this is wrong here
Option C is incorrect because Neighbor Discovery in IPv6 is not related to wireless security standards; it focuses on local-link functions like address resolution and neighbor reachability.
★ When this WOULD be the correct answer
If the exam question asked about wireless security protocols and their evolution, specifically in the context of replacing older standards, then option C could be correct as it would refer to the role of WPA3 in enhancing wireless security.
Why candidates choose this
Candidates may choose this option due to confusion between networking protocols and security standards, especially if they have encountered discussions about WPA3 in the context of modern networking practices.
✗It is the SNMP method for polling interface counters.Wrong answer — click to see why▾
Why this is wrong here
Option D is incorrect because Neighbor Discovery in IPv6 does not involve SNMP or polling interface counters; it is focused on local link functions like address resolution and neighbor reachability.
★ When this WOULD be the correct answer
If the question were about SNMP and its methods for monitoring network devices, asking specifically about how to poll interface counters, then option D would be the correct answer as it directly relates to SNMP functionality.
Why candidates choose this
Candidates might choose this option due to familiarity with SNMP concepts and a misunderstanding of how different network protocols operate, leading them to incorrectly associate polling methods with Neighbor Discovery.
Analysis generated from the official 200-301blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
Common exam trap: answer the scenario, not the keyword
A frequent exam trap is mistaking Neighbor Discovery for a routing protocol or a security mechanism. Some candidates incorrectly link it to OSPF route summarization or wireless security standards like WPA3. This confusion arises because Neighbor Discovery uses ICMPv6, which might be mistaken for routing protocol messages. However, NDP strictly operates at the local-link layer to resolve IPv6 addresses to MAC addresses and maintain neighbor reachability, not to summarize routes or secure wireless networks. Misunderstanding this can lead to selecting incorrect answers that describe unrelated functions.
Detailed technical explanation
How to think about this question
Neighbor Discovery Protocol (NDP) is a fundamental IPv6 protocol that operates on the local link to enable IPv6 devices to discover other devices, determine their link-layer addresses, and maintain reachability information. It replaces several IPv4 protocols such as ARP, ICMP Router Discovery, and ICMP Redirect. NDP uses ICMPv6 messages to perform functions like address autoconfiguration, prefix discovery, and neighbor unreachability detection, which are essential for IPv6 communication within a local network segment.
In the CCNA context, Neighbor Discovery is primarily understood as the mechanism that allows IPv6 hosts and routers to learn about their neighbors and map IPv6 addresses to MAC addresses for local delivery. This local-link function is crucial because IPv6 does not use ARP; instead, NDP handles address resolution and neighbor reachability. Recognizing NDP as a local-link protocol rather than a routing or security protocol is key to correctly answering related exam questions.
A common exam trap is confusing Neighbor Discovery with routing protocols or security standards. For example, some may mistakenly associate it with OSPF route summarization or wireless security protocols like WPA3. Understanding that NDP strictly manages local IPv6 neighbor relationships and address resolution helps avoid these pitfalls. Practically, Cisco devices implement NDP to ensure efficient IPv6 communication on LANs without relying on legacy IPv4 mechanisms.
KKey Concepts to Remember
Neighbor Discovery Protocol enables IPv6 devices to discover other devices and their link-layer addresses on the same local network segment.
NDP replaces IPv4 ARP by mapping IPv6 addresses to MAC addresses using ICMPv6 messages within the local link.
IPv6 hosts use Neighbor Discovery to maintain neighbor reachability information, ensuring reliable local communication.
Neighbor Discovery supports IPv6 address autoconfiguration and prefix discovery, which are essential for network setup.
NDP operates only on the local link and does not perform routing or route summarization functions.
Cisco devices implement Neighbor Discovery to facilitate IPv6 communication without relying on legacy IPv4 protocols.
Confusing Neighbor Discovery with routing protocols or wireless security standards is a common exam mistake.
Understanding NDP’s role in local-link IPv6 functions helps distinguish it from other protocols like OSPF or SNMP.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Neighbor Discovery Protocol enables IPv6 devices to discover other devices and their link-layer addresses on the same local network segment.
Real-world example
How this comes up in practice
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 200-301 question in full detail.
Review neighbor Discovery Protocol enables IPv6 devices to discover other devices and their link-layer addresses on the same local network segment., then practise related 200-301 questions on the same topic to reinforce the concept.
Network Infrastructure and Connectivity — This question tests Network Infrastructure and Connectivity — Neighbor Discovery Protocol enables IPv6 devices to discover other devices and their link-layer addresses on the same local network segment..
What is the correct answer to this question?
The correct answer is: It supports important local-link IPv6 functions such as neighbor discovery and local reachability behavior. — Neighbor Discovery supports key local-link IPv6 functions such as learning neighbor reachability and mapping Layer 3 information to local Layer 2 delivery. In practical terms, it helps IPv6 hosts and routers discover one another on the local segment and communicate correctly without relying on the exact same mechanisms used by IPv4.
At CCNA level, the main idea is to recognize it as a core local IPv6 function rather than a routing protocol or a wireless feature.
What should I do if I get this 200-301 question wrong?
Review neighbor Discovery Protocol enables IPv6 devices to discover other devices and their link-layer addresses on the same local network segment., then practise related 200-301 questions on the same topic to reinforce the concept.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Neighbor Discovery Protocol enables IPv6 devices to discover other devices and their link-layer addresses on the same local network segment.
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