SG0-001 · Question #349
SNMP logs on a storage device show a duplex mismatch alert. Which of the following is the MOST likely cause?
The correct answer is A. Misconfigured NIC. A duplex mismatch alert in SNMP logs indicates that two connected network devices are configured for different duplex modes, most commonly caused by a misconfiguration on one of the network interface cards.
Question
SNMP logs on a storage device show a duplex mismatch alert. Which of the following is the MOST likely cause?
Options
- AMisconfigured NIC
- BIncorrect VLAN
- CBroken cable
- DBad port
How the community answered
(27 responses)- A78% (21)
- B4% (1)
- C4% (1)
- D15% (4)
Why each option
A duplex mismatch alert in SNMP logs indicates that two connected network devices are configured for different duplex modes, most commonly caused by a misconfiguration on one of the network interface cards.
A misconfigured NIC (Network Interface Card) is the most common cause of a duplex mismatch, where one side of the link is set to full-duplex and the other to half-duplex, or one is set to auto-negotiate while the other is forced. This mismatch leads to poor performance, collisions, and often triggers alerts like those seen in SNMP logs.
An incorrect VLAN configuration would typically lead to connectivity issues or traffic being sent to the wrong network, not a duplex mismatch alert.
A broken cable usually results in a complete loss of link or intermittent connectivity, not specifically a duplex mismatch alert when the link is up.
A bad port might cause a link to fail entirely or operate intermittently, but a duplex mismatch alert specifically points to differing duplex settings rather than a physically faulty port itself.
Concept tested: Network duplex mismatch troubleshooting
Source: https://www.cisco.com/c/en/us/support/docs/switches/catalyst-6500-series-switches/10570-41.html
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