Which three options are valid Cisco STP tools used to ensure best-practice access layer design
for the enterprise campus? (Choose three.)

A.
Portfast

B.
UDLD

C.
Root Guard

D.
BPDU Guard

E.
Flex Links

F.
SPAN

G.
EtherChannel

Explanation:

Access layer Limit VLANs to a single closet when possible to provide the most deterministic and
highly available topology.
Use RPVST+ if STP is required. It provides the best convergence.
Set trunks to ON and ON with no-negotiate
Manually prune unused VLANs to avoid broadcast propagation.
Use VTP Transparent mode, because there is little need for a common VLAN database in
hierarchical networks.
Disable trunking on host ports, because it is not necessary. Doing so provides more security and
speeds up PortFast.
Consider implementing routing in the access layer to provide fast convergence and Layer 3 load
balancing.
Use Cisco STP Toolkit, which provides PortFast, Loop Guard, Root Guard, and BPDU Guard.