STP Basics and Concepts 4

Question 1

Which STP enhancement runs a separate spanning tree instance per VLAN on Cisco switches?

Accepted Answer

PVST+

Answer

RSTP (802.1w)

Answer

MSTP (802.1s)

Answer

Common Spanning Tree (CST)

Question 2

In STP, what does the 'port ID' consist of?

Accepted Answer

Port priority and port number

Answer

MAC address and VLAN ID

Answer

Bridge priority and MAC address

Answer

Interface speed and duplex

Question 3

What is the STP behavior when two switches are connected by two parallel links and one switch is non-root?

Accepted Answer

One port becomes root port; the other is blocked

Answer

Both ports on the non-root switch forward traffic

Answer

Both ports enter the Learning state permanently

Answer

STP is disabled on both links

Question 4

Which STP timer defines how frequently the root bridge sends BPDUs?

Accepted Answer

Hello time

Answer

Max age

Answer

Forward delay

Answer

Hold time

Question 5

What is the effect of configuring PortFast on a switch port?

Accepted Answer

The port skips Listening and Learning and goes directly to Forwarding

Answer

The port becomes a root port immediately

Answer

STP is completely disabled on the switch

Answer

The port blocks all non-BPDU traffic

Question 6

What is the Bridge Protocol Data Unit (BPDU) guard feature designed to do?

Accepted Answer

Shut down a PortFast port if it receives a BPDU

Answer

Prevent root bridge elections on trunk ports

Answer

Increase BPDU transmission frequency

Answer

Prioritize BPDU traffic over data frames

Question 7

Which STP port state is responsible for populating the MAC address table but NOT forwarding data frames?

Accepted Answer

Learning

Answer

Blocking

Answer

Listening

Answer

Forwarding