Which protocol is a Cisco proprietary implementation of STP?
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A. B. C. D.D
The correct answer is D. PVST+.
PVST+ stands for Per VLAN Spanning Tree Plus. It is a Cisco proprietary implementation of the Spanning Tree Protocol (STP). The purpose of PVST+ is to create a separate instance of the STP for each VLAN in a network. This allows for better load balancing and redundancy for each VLAN.
PVST+ is similar to the IEEE 802.1Q standard for VLAN tagging, but it adds a Cisco-specific extension that allows for the creation of multiple spanning tree instances. Each VLAN in a network can have its own instance of the STP, which means that there can be multiple paths for traffic to flow through the network. This provides better resilience and improved performance.
The other options listed in the question are:
A. CST - Cisco's proprietary version of STP that was used before PVST+. It is a single spanning tree that is applied across all VLANs in a network.
B. RSTP - Rapid Spanning Tree Protocol is an updated version of the STP standard that provides faster convergence times.
C. MSTP - Multiple Spanning Tree Protocol is a standard that allows for multiple instances of the STP to be created, but it groups VLANs together into instances based on administrative configuration.
Overall, PVST+ is a Cisco proprietary implementation of STP that allows for a separate instance of the STP to be created for each VLAN in a network. This provides better load balancing and redundancy for each VLAN, and it is the preferred option for Cisco networks.