Configuration and Management Flashcards

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

Answer: spanning-tree vlan 10 root primary

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

What is the default STP hello time on Cisco switches?

Answer: 2 seconds

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

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

Answer: 0–240 in increments of 16

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

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

Answer: spanning-tree mode rapid-pvst

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

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

Answer: The port is placed in err-disabled state

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

Which command verifies the STP root bridge and port roles on a Cisco switch for VLAN 1?

Answer: show spanning-tree vlan 1

The 'show spanning-tree vlan 1' command displays detailed STP information including root ID, local bridge ID, and all port roles for VLAN 1.

What is the purpose of 'spanning-tree vlan 10 root secondary'?

Answer: Sets priority to 28672 to become backup root if the primary fails

The 'root secondary' macro sets the bridge priority to 28672, making it the second-lowest priority to serve as backup root.