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Exam 300-115 topic 5 question 62 discussion

Actual exam question from Cisco's 300-115
Question #: 62
Topic #: 5
[All 300-115 Questions]

With RSTP hello timers set to the default interval, how quickly can a non-edge port discover that its neighbor is down?

  • A. 20 seconds
  • B. 10 seconds
  • C. 6 seconds
  • D. 5 seconds
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Suggested Answer: C 🗳️
With Rapid Spanning Tree Protocol (RSTP) hello timers set at the default interval, a non-edge port can discover that its neighbor is down in 6 seconds. One of the advantages of RSTP over STP is quicker convergence when changes occur in the topology. After a non-edge port fails to receive three Bridge Protocol Data Units
(BPDUs) from its neighbor, it will assume the neighbor to be down and will age out all information regarding the neighbor. Since hellos are sent at 2-second intervals in RSTP, it will take only 6 seconds for this to occur, as compared to 20 seconds for STP.
All other options are incorrect values for the default convergence time for RSTP.
Objective:

Layer 2 Technologies -
Sub-Objective:
Configure and verify spanning tree
References:
Cisco > Home > Support > Technology Support > LAN Switching > Spanning Tree Protocol > Technology Information > Technology White Paper > Understanding
Rapid Spanning Tree Protocol (802.1w)

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Bastex
5 years, 7 months ago
https://www.cisco.com/c/en/us/support/docs/lan-switching/spanning-tree-protocol/24062-146.html#anc7
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