In what situation must spanning-tree be implemented?

In what situation must spanning-tree be implemented?
A . when first hop redundancy protocol exists with redundant Layer 2 links between distribution
switches
B . when a VLAN spans access layer switches to support business applications
C . when trunks need to extend multiple VLANs across access switches
D . when it is necessary to speed up network convergence in case of link failure

View Answer

Answer: B

Explanation:

https://www.safaribooksonline.com/library/view/foundation-learning-guide/9780132652933/ch02.html

You may need to implement STP for several reasons:

– When a VLAN spans access layer switches to support business applications;