Cisco CCNA 200-125 Exam: Understanding Err-Disabled Status on Ethernet Interfaces

Err-Disabled Status on Ethernet Interfaces

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Which condition does the err-disabled status indicate on an Ethernet interface?



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


The possible conditions that could cause an interface to become err-disabled are:

A. Duplex mismatch: This occurs when the devices at either end of the Ethernet link have different settings for duplex (full-duplex or half-duplex) and cannot communicate properly. The switch detects this mismatch and disables the interface to prevent further problems.

B. Device at the other end of the connection is powered off: If the switch cannot detect any signal from the device at the other end of the Ethernet link, it assumes that the device is powered off and disables the interface.

C. Serial interface is disabled: This is not applicable to Ethernet interfaces.

D. Interface is configured with the shutdown command: If the interface has been manually shut down using the "shutdown" command, it will be disabled.

E. Port security has disabled the interface: Port security is a feature that restricts access to a port based on the MAC address of the device connected to it. If the switch detects a violation of the port security policy (e.g. a MAC address that is not allowed), it will disable the interface.

F. The interface is fully functioning: This is not true in the case of an err-disabled interface. An interface in this state has been disabled by the switch due to an error condition.

To recover from an err-disabled state, the cause of the error must be identified and fixed, and the interface must be manually re-enabled using the "no shutdown" command.