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At which layer of the OSI model is RSTP used to prevent network loops?
Transport
Physical
Data link
Network
Spanning Tree protocol functions at the layer 2 of the OSI Model. This protocol stops loops that redundant links create in switched networks. For more information refer to: [http://www.cisco.com/c/en/us/support/docs/lan-switching/spanning-tree-protocol/24062-146.html]
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