【多选题】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...
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 spanning-tree convergence time within each VLAN.