N10-009 Question #264: Real Exam Question with Answer & Explanation

Question

A network administrator is trying to locate the switch interface a PC is connected to. The administrator accesses the local switch, pings the PC IP address, and then uses the command show arp. Which of the following commands should the administrator use next?

Options

• Ashow route
• Bshow mac-address-table
• Cshow vlan
• Dshow interface

Explanation

To locate a PC's switch interface, the administrator first pings the PC and then uses 'show arp' to find its MAC address.

Common mistakes.

• A. show route displays the routing table, which is used for forwarding packets between networks and does not help locate a device's physical connection on a local switch.
• C. show vlan displays VLAN information, which is relevant for logical segmentation but does not directly map a MAC address to a specific physical port.
• D. show interface displays details about all interfaces, but without knowing the specific interface, it is not an efficient way to locate a PC among many ports on a switch.

Concept tested. Locating a device by MAC address on a switch

Reference. https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750/software/release/12-2_40_se/configuration/guide/scg/sweth.html

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