200-105 Exam Dumps | At which layer of the OSI model is RSTP used to prevent loops?

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Interconnecting Cisco Networking Devices Part 2 (ICND2 v3.0)
Cisco.200-105.v2018-06-20.q119
Question 109

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Question 109/119

At which layer of the OSI model is RSTP used to prevent loops?

A. physical

B. data link

C. network

D. transport

Correct Answer: B

Explanation/Reference:
Spanning Tree Protocol Problems and Related Design Considerations
Reference:
http://www.cisco.com/en/US/tech/tk389/tk621/technologies_tech_note09186a00800951ac.shtml Explanation:
The primary function of the spanning-tree algorithm (STA) is to cut loops that redundant links create in bridge networks. The STP operates at Layer 2 of the Open System Interconnection (OSI) model. By means of bridge protocol data units (BPDUs) that exchange between bridges, the STP elects the ports that eventually forward or block traffic. This protocol can fail in some specific cases, and troubleshooting the resulting situation can be very difficult, which depends on the design of the network. In this particular area, you perform the most important part of the troubleshooting before the problem occurs.

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