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Exam 400-101 topic 1 question 60 discussion

Actual exam question from Cisco's 400-101
Question #: 60
Topic #: 1
[All 400-101 Questions]

Which statement is true regarding UDLD and STP timers?

  • A. The UDLD message timer should be two times the STP forward delay to prevent loops.
  • B. UDLD and STP are unrelated features, and there is no relation between the timers.
  • C. The timers need to be synced by using the spanning-tree udld-sync command.
  • D. The timers should be set in such a way that UDLD is detected before the STP forward delay expires.
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Suggested Answer: D 🗳️
UDLD is designed to be a helper for STP. Therefore, UDLD should be able to detect an unidirectional link before STP would unblock the port due to missed
BPDUs. Thus, when you configure UDLD timers, make sure your values are set so that unidirectional link is detected before "STP MaxAge + 2xForwardDelay" expires.
Reference: http://blog.ine.com/tag/stp/
by kidschannel1988 at April 3, 2025, 6:08 p.m.

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