Which two scenarios would result in a duplex mismatch? (Choose two.)
- connecting a device with autonegotiation to another that is manually set to full-duplex
- starting and stopping a router interface during a normal operation
- connecting a device with an interface running at 100 Mbps to another with an interface running at 1000 Mbps
- configuring dynamic routing incorrectly
- manually setting the two connected devices to different duplex modes
Explanation: A duplex mismatch occurs when the two ends of an Ethernet link operate in different duplex modes. This happens if both ends are manually configured to different settings (one full and one half) or if one end is set to autonegotiate while the other is manually fixed at full-duplex. In the latter case, the autonegotiating end typically fails to detect the duplex and defaults to half-duplex, resulting in a mismatch that causes interface errors and late collisions.
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