This 200-901 practice question tests your understanding of network fundamentals. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 engineer is configuring a Cisco switch to support LLDP-MED for VoIP phones. Which command is required to enable LLDP globally on the switch?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "which command"
Why it matters: Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
lldp transmit
Why wrong: This command is for interface-level configuration.
cdp run
Why wrong: CDP is a different protocol.
lldp run
This enables LLDP globally on Cisco IOS switches.
lldp enable
Why wrong: This is not the correct Cisco command; 'lldp run' is used globally.
lldp med
Why wrong: This enables LLDP-MED but after LLDP is globally enabled.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
lldp run
The command 'lldp run' is required to enable LLDP globally on a Cisco switch. LLDP is disabled by default on most Cisco switches, and 'lldp run' activates the protocol at the global configuration level, allowing LLDP-MED (which extends LLDP for VoIP and other endpoint devices) to function. Without this global enablement, LLDP frames are not transmitted or received, even if per-interface commands like 'lldp transmit' or 'lldp receive' are configured.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
lldp transmit
Why it's wrong here
This command is for interface-level configuration.
cdp run
Why it's wrong here
CDP is a different protocol.
lldp run
Why this is correct
This enables LLDP globally on Cisco IOS switches.
Clue confirmation
The clue word "which command" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
lldp enable
Why it's wrong here
This is not the correct Cisco command; 'lldp run' is used globally.
lldp med
Why it's wrong here
This enables LLDP-MED but after LLDP is globally enabled.
Common exam traps
Cisco often tests the distinction between global and interface-level LLDP commands, and the trap here is that candidates confuse 'lldp run' (global enable) with 'lldp enable' (a nonexistent command) or assume that 'lldp transmit' alone is sufficient to start LLDP.
Trap categories for this question
Command / output trap
This command is for interface-level configuration.
Detailed technical explanation
LLDP (IEEE 802.1AB) is a vendor-neutral link-layer protocol that allows network devices to advertise their identity, capabilities, and neighbors. LLDP-MED (ANSI/TIA-1057) extends LLDP with additional TLVs for VoIP endpoints, such as power via PoE, network policy, and location identification. On Cisco switches, LLDP is disabled by default, and the 'lldp run' command must be entered in global configuration mode to start the LLDP process; after that, per-interface commands like 'lldp transmit' and 'lldp receive' can be used to control LLDP behavior on specific ports. A common real-world scenario is deploying IP phones that require LLDP-MED for VLAN assignment and PoE negotiation, where forgetting 'lldp run' leads to phones failing to receive the correct voice VLAN.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the 200-901 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Network Fundamentals — This question tests Network Fundamentals — Read the scenario before looking for a memorised answer..
The correct answer is: lldp run — The command 'lldp run' is required to enable LLDP globally on a Cisco switch. LLDP is disabled by default on most Cisco switches, and 'lldp run' activates the protocol at the global configuration level, allowing LLDP-MED (which extends LLDP for VoIP and other endpoint devices) to function. Without this global enablement, LLDP frames are not transmitted or received, even if per-interface commands like 'lldp transmit' or 'lldp receive' are configured.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "which command". Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
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