An engineer finds that a specific HPE switch interface has high error rates. Which two parameters are most likely causing this issue?

Question

Options

• ADuplex mismatch
• BPort speed
• CVLAN misconfiguration
• DLACP mode

• A
  88% (38)
• C
  2% (1)
• D
  9% (4)

Explanation

Duplex mismatch (A) and port speed (B) are the classic culprits for high interface error rates because they operate at Layer 1/2 and directly cause frame errors, collisions, and CRC failures. A duplex mismatch - one side at full-duplex, the other at half - triggers late collisions and runts on the half-duplex side, inflating error counters. A port speed mismatch prevents the link from establishing cleanly or causes constant framing errors when negotiation fails.

VLAN misconfiguration (C) would cause traffic to be dropped or forwarded incorrectly, but this appears as connectivity loss or incorrect routing - not raw interface error counters. LACP mode (D) affects whether a port-channel bundle forms, but a misconfigured LACP mode causes the logical channel to stay down, not error spikes on a single physical interface.

Memory tip: Think "Physical first" - error counters live at the physical/data-link layer, so speed and duplex are always your first suspects before jumping to logical configurations like VLANs or link aggregation.

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