How to Identify Physical Switch Ports for Connected Devices?
While troubleshooting a VoIP handset connection, a technician's laptop is able to successfully connect to network resources using the same port. The technician needs to identify the port on the switch. Which of the following should the technician use to determine the switch and port?
Community Votes
100% of anonymous learners picked answer A. Votes are pick records left by other test-takers — they are not the verified answer.
Community Insight
This question tests knowledge of Layer 2 neighbor discovery protocols, with the common trap being confusion between local operating system network utilities and physical infrastructure mapping tools.
LLDP automatically advertises device identity and port adjacency at Layer 2 to simplify physical network mapping. Community consensus strongly validates LLDP as the correct vendor-neutral solution for troubleshooting switch-to-voice endpoint connections.
Candidates frequently select netstat because it displays active connections, but it only reports logical TCP/UDP sockets on the local machine rather than physical switch port topology.
Community Discussion (5 comments)
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Expert Analysis
Why the Answer Is Correct
LLDP operates at the data link layer to broadcast device identity, capabilities, and directly connected port information across adjacent network equipment. Modern VoIP handsets leverage LLDP-MED extensions to communicate power requirements and network policies to the switch, enabling technicians to quickly trace physical connectivity. Querying the switch via LLDP provides immediate visibility into which ingress port hosts the endpoint.Why the Other Options Are Wrong
IKE manages cryptographic key negotiation for IPsec tunnels and plays no role in physical port identification or device discovery. VLANs function as logical broadcast domains that segment traffic but lack any mechanism to report hardware adjacency or switch port mappings. netstat enumerates active transport-layer sessions and listening ports within a host operating system, rendering it completely ineffective for external infrastructure troubleshooting.Community Comment Notes
Contributors consistently highlight LLDP’s vendor-neutral nature, noting it outperforms Cisco’s legacy CDP when dealing with third-party VoIP manufacturers. Several users recommend executing theshow lldp neighbors command to instantly display connected devices alongside their corresponding switch interfaces. These practical CLI tips directly align with real-world certification scenarios and validate LLDP as the definitive troubleshooting choice. Official Reference
Exam Strategy
Always distinguish between host-side diagnostic commands and infrastructure discovery protocols during the exam. When a scenario emphasizes physical tracing, neighbor identification, or cross-vendor compatibility, immediately prioritize LLDP or CDP over transport-layer utilities.
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