hardMultiple Choice
200-901 Practice Question: Is configuring a Cisco switch to support LLDP-MED…
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?
⚠ Common exam trap
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.
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
✓
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.
Answer analysis
Option-by-option breakdown
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
On Cisco IOS, 'lldp transmit' is an interface-level subcommand controlling whether that port sends LLDP advertisements; it cannot enable LLDP globally. It is tempting because it names LLDP transmission, but global enablement requires the configuration-mode command 'lldp run', which this option does not supply.
- ✗
cdp run
Why it's wrong here
'cdp run' enables Cisco Discovery Protocol, a separate proprietary neighbour-discovery protocol, not LLDP; LLDP-MED phones require LLDP itself. It is tempting because CDP also advertises device information, but it does not provide the LLDP TLVs that VoIP endpoints use, so global 'lldp run' is still needed.
- ✓
lldp run
Why this is correct
LLDP runs disabled by default on Cisco switches, so the global configuration command lldp run is required before any interface-level LLDP-MED settings take effect. This satisfies the stem's constraint of enabling LLDP globally, allowing VoIP phones to discover and negotiate power and voice VLAN parameters.
- ✗
lldp enable
Why it's wrong here
Cisco IOS has no 'lldp enable' command; LLDP is switched on globally with 'lldp run' in global configuration mode. The syntax is tempting because 'enable' appears in many IOS commands, yet it is not part of the LLDP command set, so the switch rejects it.
- ✗
lldp med
Why it's wrong here
'lldp med' is not a valid global command; LLDP-MED network policy is configured under interface LLDP settings once LLDP itself is running. It is tempting because the scenario concerns LLDP-MED for VoIP phones, but MED tuning presupposes the global 'lldp run' command this option omits.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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