STP Configuration and Management 2

Question 1

Which command sets a Cisco switch as the root bridge for VLAN 10 using the preferred method?

Accepted Answer

spanning-tree vlan 10 root primary

Answer

The 'spanning-tree vlan 10 root primary' macro automatically sets the priority to 24576 (or lower if needed) to make the switch root.

Question 2

What is the default STP hello time on Cisco switches?

Accepted Answer

2 seconds

Answer

The default STP hello time is 2 seconds, which is the interval between configuration BPDUs sent by the root bridge.

Question 3

When configuring PVST+, what is the valid range for the spanning-tree port priority value?

Accepted Answer

0–240 in increments of 16

Answer

Port priority in PVST+ ranges from 0 to 240 in increments of 16, with a default of 128.

Question 4

Which Cisco IOS command enables Rapid PVST+ globally on a switch?

Accepted Answer

spanning-tree mode rapid-pvst

Answer

The command 'spanning-tree mode rapid-pvst' enables Rapid Per-VLAN Spanning Tree Plus on Cisco IOS switches.

Question 5

What happens to a port configured with 'spanning-tree bpduguard enable' when it receives a BPDU?

Accepted Answer

The port is placed in err-disabled state

Answer

BPDU Guard immediately err-disables a port upon receiving a BPDU to protect against unauthorized switches.

(STP) Spanning Tree Protocol Practice Test