STP Configuration and Management 4

Question 1

An administrator wants to influence STP path selection on a per-port basis without changing bridge priority. What is the correct approach?

Accepted Answer

Change the port cost using 'spanning-tree vlan X cost'

Answer

Adjusting the port cost with 'spanning-tree vlan X cost' influences which path STP prefers without altering the bridge priority.

Question 2

What is the default STP port cost for a 1 Gbps link using the IEEE long path cost method?

Accepted Answer

20000

Answer

Using the IEEE 802.1t long path cost method, a 1 Gbps link has a default cost of 20000, providing finer granularity for high-speed links.

Question 3

Which of the following correctly describes the 'spanning-tree pathcost method long' command?

Accepted Answer

Switches the switch from 16-bit to 32-bit path cost values globally

Answer

The 'spanning-tree pathcost method long' global command changes path cost calculation from the short (16-bit) method to the long (32-bit) method for better differentiation of high-bandwidth links.

Question 4

When MST is configured, what is the function of the MST instance 0 (IST)?

Accepted Answer

It carries all unassigned VLANs and interoperates with CST at region boundaries

Answer

MST Instance 0 (IST) carries all VLANs not mapped to other MSTIs and represents the MST region to the outside CST.

Question 5

What three parameters must match exactly for two switches to be in the same MST region?

Accepted Answer

Region name, revision number, and VLAN-to-instance mapping

Answer

MST region membership requires identical configuration name, revision number, and VLAN-to-instance mapping on all participating switches.

(STP) Spanning Tree Protocol Practice Test

(STP) Spanning Tree Protocol Practice Test

STP Configuration and Management 4