Refer to the exhibit. Users from the Engineering VLAN complain that every time Business VLAN
users have a network connectivity issue, the Engineering VLAN users usually have problems
experiencing slow response or network connectivity problems. After troubleshooting, an
unauthorized switch 2 was found. This unauthorized switch has been a regular problem, assuming
the root bridge function under the spanning-tree domain and causing the Engineering VLAN to be
unstable. Which three of these actions could be suggested to fix the problem?

A.
Upgrade Spanning Tree Protocol to Rapid Spanning Tree Protocol.

B.
Change Business VLAN PCs to switch 1 and switch 4.

C.
Force the root bridge to be switch 2, instead.

D.
Adjust spanning-tree timers (max-age and forward-delay).

E.
Shut down all unused ports.

F.
Use MSTP to separate the Engineering VLAN from the Business VLAN to optimize spanningtree convergence time within each VLAN

Explanation:
The best action is to shut down unused ports and use MSTP to separate Engineering VLAN from
the business VLAN so that spanning-tree convergence time can be optimized within each VLAN.
Also upgrade spanning tree protocol to Rapid spanning tree protocol (RSTP).