Which global command must be enabled on Cisco devices to allow network topology mapping via LLDP?
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Correct answer: Device(config)#lldp run.
Why this is the answer
The lldp run global configuration command enables LLDP (Link Layer Discovery Protocol) globally on a Cisco device. LLDP is a vendor-neutral protocol used to discover neighboring devices and their capabilities, which is essential for network topology mapping. Without this command, LLDP will not operate. cdp run enables Cisco Discovery Protocol (CDP), which is a Cisco-proprietary protocol, not vendor-neutral like LLDP. While CDP also aids in topology mapping, the question specifically asks about LLDP. cdp enable is an interface-specific command to enable CDP on a particular interface, not globally. flow-sampler-map topology is related to NetFlow or IPFIX for traffic analysis, not directly to neighbor discovery for topology mapping.
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