Which protocol designed to replace STP operates at Layer 3 of the OSI model?

a.

Shortest Path Bridging (SPB)

b.

Transparent Interconnection of Lots of Links (TRILL)

c.

Multiple Spanning Tree Protocol (MSTP)

d.

Rapid Spanning Tree Protocol (RSTP)

a. Shortest Path Bridging (SPB).

Explanation:

Spanning Tree Protocol (STP) : -This protocol generates a single spanning tree for the whole network. Ensures that there is no loop in the topology. However it does not meet today's requirements.

Shortest Path Bridging is a protocol intended to clarify the creation and configuration of networks.