LLDP is the correct choice because it is the IEEE 802.1AB standard protocol specifically designed for lldp network device discovery protocol tasks, operating at Layer 2 to automatically identify directly connected neighbors and their capabilities, such as system name, port ID, and VLAN information, without requiring IP connectivity. On the CompTIA Network+ N10-009 exam, this question tests your ability to distinguish between vendor-neutral and proprietary discovery protocols—a common trap is confusing LLDP with Cisco’s CDP, but remember that LLDP works across multi-vendor environments. For memory, think “LLDP = Link Layer = Layer 2, no IP needed,” and recall that it uses Type-Length-Value (TLV) structures to share detailed device information.
N10-009 Network Operations Practice Question
This N10-009 practice question tests your understanding of network operations. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
A network technician needs to discover directly connected network devices and their capabilities for documentation purposes. Which protocol should be used?
Why wrong: SNMP is used for managing and monitoring network devices, but it does not automatically discover directly connected neighbors.
B
LLDP
LLDP enables devices to advertise information about themselves to neighboring devices, making it suitable for discovering directly connected neighbors.
C
ICMP
Why wrong: ICMP is used for error reporting and diagnostic functions like ping and traceroute, not for neighbor discovery.
D
ARP
Why wrong: ARP resolves IP addresses to MAC addresses but does not provide information about device capabilities or identity.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
LLDP
LLDP (Link Layer Discovery Protocol) is the correct choice because it is an IEEE 802.1AB standard protocol specifically designed to discover directly connected network devices and their capabilities, such as system name, port description, VLAN information, and management addresses. Unlike proprietary protocols, LLDP operates at Layer 2 and allows any vendor's equipment to advertise and learn about neighbors without requiring IP connectivity or a management station.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
SNMP
Why it's wrong here
SNMP is used for managing and monitoring network devices, but it does not automatically discover directly connected neighbors.
✓
LLDP
Why this is correct
LLDP enables devices to advertise information about themselves to neighboring devices, making it suitable for discovering directly connected neighbors.
Related concept
Read the scenario before looking for a memorised answer.
✗
ICMP
Why it's wrong here
ICMP is used for error reporting and diagnostic functions like ping and traceroute, not for neighbor discovery.
✗
ARP
Why it's wrong here
ARP resolves IP addresses to MAC addresses but does not provide information about device capabilities or identity.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the trap that candidates confuse LLDP with CDP (Cisco Discovery Protocol), but the question explicitly asks for a protocol to discover directly connected devices and their capabilities, and LLDP is the standards-based answer, while CDP is Cisco-proprietary and not always the correct choice in multi-vendor environments.
Detailed technical explanation
How to think about this question
LLDP frames are sent as multicast Ethernet frames (destination MAC 01:80:C2:00:00:0E) to all ports, and each device stores received information in a local MIB (LLDP-MIB, RFC 2922). A subtle behavior is that LLDP frames are not forwarded by switches (they are trapped by the CPU), ensuring only directly connected neighbors are discovered. In real-world scenarios, LLDP is critical for network documentation and troubleshooting because it reveals the exact port-to-port connectivity and capabilities like PoE support or duplex mismatch.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
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
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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 N10-009 question in full detail.
Network Operations — This question tests Network Operations — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: LLDP — LLDP (Link Layer Discovery Protocol) is the correct choice because it is an IEEE 802.1AB standard protocol specifically designed to discover directly connected network devices and their capabilities, such as system name, port description, VLAN information, and management addresses. Unlike proprietary protocols, LLDP operates at Layer 2 and allows any vendor's equipment to advertise and learn about neighbors without requiring IP connectivity or a management station.
What should I do if I get this N10-009 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
This N10-009 practice question is part of Courseiva's free CompTIA 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 N10-009 exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.