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Exam 400-101 topic 2 question 432 discussion

Actual exam question from Cisco's 400-101
Question #: 432
Topic #: 2
[All 400-101 Questions]

Which technology can be used to secure the edge of an STP domain?

  • A. BPDU guard
  • B. BPDU filter
  • C. UplinkFast
  • D. root guard
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Suggested Answer: D 🗳️
by Error_404 at Jan. 22, 2020, 9:30 p.m.

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Error_404
5 years, 5 months ago
Answer A (BPDU guard) is correct BPDU guard and root guard are similar, but their impact is different. BPDU guard disables the port upon BPDU reception if PortFast is enabled on the port. The disablement effectively denies devices behind such ports from participation in STP. https://www.cisco.com/c/en/us/support/docs/lan-switching/spanning-tree-protocol/10588-74.html#diff
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