Question 269 of 952 from exam 200-125: Cisco Certified Network Associate Exam

Question 269 of 952 from exam 200-125: Cisco Certified Network Associate Exam

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Question

Which three options are switchport configurations that can always avoid duplex mismatch errors between the switches? (Choose three.)

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Explanations

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A. B. C. D. E. F.

ABD

Duplex mismatch is a common issue that arises when two network devices have different duplex settings, i.e., one is set to full duplex and the other is set to half duplex, causing communication problems between them. To avoid such issues, it's crucial to configure the switchports correctly. Here are the three switchport configurations that can always avoid duplex mismatch errors:

A. Set both sides to auto-negotiation: Auto-negotiation allows two devices to exchange information about their capabilities, including their duplex mode, and negotiate the best possible configuration for both sides. If both switches are set to auto-negotiation, they will detect each other's duplex mode and negotiate a compatible setting. This is the most recommended configuration as it enables the switches to operate at their optimal settings.

D. Set both sides to full duplex: Full duplex enables data to be transmitted in both directions simultaneously, thus providing optimal performance. If both switches are set to full duplex, there will be no mismatch since they are communicating using the same settings. However, this configuration may not work if the cabling or network devices do not support full duplex.

E. Set one side to auto and the other side to full duplex: This configuration can work in situations where one switch does not support full duplex or auto-negotiation. If one switch is set to full duplex and the other to auto-negotiation, the auto-negotiating switch will detect the full duplex setting and configure itself accordingly, avoiding a mismatch.

Therefore, options A, D, and E are the correct answers. Options B, C, and F are not recommended as they can lead to duplex mismatches. Configuring both sides to half duplex, setting one side to auto and the other side to half duplex, or setting one side to full duplex and the other to half duplex can cause communication issues between the switches.

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