200-301 Question #700: Real Exam Question with Answer & Explanation

Question

which command is used to know the duplex speed of serial link?

Options

• Ashow line
• Bshow interface
• Cshow protocol
• Dshow run

Explanation

The show interface command provides detailed information about a network interface, including its duplex and speed settings for various link types.

Common mistakes.

• A. The show line command typically displays information about console, auxiliary, and virtual terminal (VTY) lines, primarily focusing on connection status and user sessions, not physical interface characteristics like duplex and speed.
• C. The show protocol command is not a standard Cisco IOS command; commands like show ip protocols display routing protocol information, not interface duplex/speed.
• D. The show running-config (or show run) command displays the device's current configuration, which might show explicitly configured duplex/speed settings, but it does not show the operational duplex and speed that can be negotiated, unlike show interface.

Concept tested. Cisco IOS commands for interface status

Reference. https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/interface/configuration/15-mt/ir-15-mt-book/ir-if-gen-cfg.html

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