Question

Which spanning tree standard supports only one root bridge so that traffic from all VLANs flows over the same path?

1) Rapid PVST
2) 802.1D
3) MST
4) PVST+

Answer 1

The 802.1D Spanning Tree Protocol is the standard that allows only one root bridge for all VLANs, causing all traffic to flow over the same path.

Step-by-step explanation:

The spanning tree standard that supports only one root bridge, such that traffic from all VLANs flows over the same path, is 802.1D.

Also known as the Classic Spanning Tree Protocol (CSTP), 802.1D doesn't allow for a separate spanning tree for each VLAN, which means all traffic will indeed traverse the same path. This is unlike Rapid PVST+, PVST+, and MST, all of which allow for multiple spanning trees, providing individual trees for each VLAN or for a group of VLANs.