During the daily operation and maintenance of WLAN, an engineer found that the status of a certain interface of the wireless controller was abnormal. After troubleshooting, he suspected that the…

Question

Options

• Adisplay Current-configuration interface
• BDisplay interface Brief
• Cdisplay ip Interface
• Ddisplay interface

• A
  6% (1)
• B
  17% (3)
• C
  6% (1)
• D
  72% (13)

Explanation

display interface provides full physical-layer detail for an interface, including the actual negotiated speed and duplex mode - exactly what's needed to compare configured versus operational negotiation state and confirm a mismatch.

Why the distractors are wrong:

• A (display current-configuration interface) shows what is configured in the running config, not the actual negotiated result - a port can be configured for auto-negotiation but have negotiated to the wrong speed/duplex.
• B (display interface brief) gives only a high-level summary (link state, IP, bandwidth) without the granular negotiation details.
• C (display ip interface) focuses on Layer 3 information (IP addresses, protocol state), not Layer 1/2 physical negotiation parameters.

Memory tip: Think of it as "less = less detail" - the more qualifiers you add to the command (brief, ip, current-configuration), the more you're filtering out raw physical data. When you suspect a hardware negotiation problem, use the bare display interface to get the unfiltered physical stats.

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