STP Configuration and Management 3

Question 1

Which STP feature automatically sets an access port to forwarding state immediately without going through listening and learning?

Accepted Answer

PortFast

Answer

BPDU Filter

Answer

Loop Guard

Answer

Root Guard

Question 2

What command enables PortFast on all non-trunking access ports globally on a Cisco switch?

Accepted Answer

spanning-tree portfast default

Answer

spanning-tree portfast all

Answer

spanning-tree portfast enable global

Answer

interface range fastethernet 0/1-24 spanning-tree portfast

Question 3

Root Guard is best applied to which type of port?

Accepted Answer

Designated ports where unauthorized root bridges might appear

Answer

Ports connected to end-user devices

Answer

Root ports on non-root switches

Answer

Trunk ports connected to the core layer

Question 4

What does the 'spanning-tree loopguard default' command do?

Accepted Answer

Enables Loop Guard globally on all point-to-point ports

Answer

Enables Loop Guard on all PortFast-enabled ports

Answer

Disables BPDUs on all ports to prevent loops

Answer

Enables Loop Guard only on root ports

Question 5

Which STP timer controls how long a port remains in the listening and learning states?

Accepted Answer

Forward delay

Answer

Hello time

Answer

Max age

Answer

Hold time

Question 6

What is the effect of reducing the STP max-age timer below its default of 20 seconds?

Accepted Answer

Switches declare a root bridge failure more quickly, speeding up convergence

Answer

Ports transition to forwarding faster after a link failure

Answer

The root bridge sends BPDUs more frequently

Answer

BPDU guard trips more frequently on edge ports

Question 7

Which command displays a summary of the number of STP instances and port states on a Cisco switch?

Accepted Answer

show spanning-tree summary

Answer

show spanning-tree detail

Answer

show spanning-tree vlan 1

Answer

show spanning-tree root