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








 

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)

This question is in 300-115 Implementing Cisco IP Switched Networks (SWITCH) Exam
For getting Cisco Certified Network Professional (CCNP) Routing and Switching Certificate





Disclaimers:
The website is not related to, affiliated with, endorsed or authorized by Cisco.
Trademarks, certification & product names are used for reference only and belong to Cisco.
The website does not contain actual questions and answers from Cisco's Certification Exam.