Which two statements about UDLD aggressive mode are true?

Which two statements about UDLD aggressive mode are true? (Choose two.)
A. UDLD automatically chooses the messaging interval based on the configured timers.
B. If a unidirectional link is detected, the port stake is determined by spanning tree.
C. If a unidirectional link is detected, the port state is changed to errdisable.
D. UDLD attempts to re-establish a downed link one time before declaring the link down.
E. The UDLS detection timer is four times the messaging interval by default.
F. UDLD messages are sent every 15 seconds.

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4 thoughts on “Which two statements about UDLD aggressive mode are true?

  1. The UDLD tries to re-establish the connection with the neighbor; the port is disabled after eight failed retries.

  2. Why not C, check this out from the offical cert guide

    Aggressive mode : When a unidirectional link condition is detected, the switch takes
    action to reestablish the link. UDLD messages are sent out once a second for 8 seconds.
    If none of those messages is echoed back, the port is placed in the errdisable
    state so that it cannot be used.

  3. https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/lanswitch/configuration/xe-3s/asr903/lanswitch-xe-3s-asr903-book/lsw-udld.html

    Set the time in seconds between UDLD probe messages. The valid range is from 7 to 90 seconds. The default is 15 seconds.

    When the UDLD aggressive mode is enabled, the UDLD can error disable the ports on the link to prevent the traffic from being discarded under the following scenarios:
    One side of a link has a port (either Tx and Rx) stuck.
    One side of a link remains up while the other side of the link has gone down.

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