CISCO 2 MODULE 5-6

What additional information is contained in the 12-bit extended system ID of a BPDU?

• MAC address

• VLAN ID

• IP address

• port ID

During the implementation of Spanning Tree Protocol, all switches are rebooted by the network administrator. What is the first step of the spanning-tree election process?

• • Each switch with a lower root ID than its neighbor will not send BPDUs.

• • All the switches send out BPDUs advertising themselves as the root bridge.

• • Each switch determines the best path to forward traffic.

• • Each switch determines what port to block to prevent a loop from occurring.

Which STP port role is adopted by a switch port if there is no other port with a lower cost to the root bridge?

• • designated port

• • root port

• • alternate

• • disabled port

Which two concepts relate to a switch port that is intended to have only end devices attached and intended never to be used to connect to another switch? (Choose two.)

• • bridge ID

• • edge port

• • extended system ID

• • PortFast

• • PVST+

Which three components are combined to form a bridge ID?

• • extended system ID

• • cost

• • IP address

• • bridge priority

• • MAC address

In which two port states does a switch learn MAC addresses and process BPDUs in a PVST network? (Choose two.)

• • disabled

• • forwarding

• • listening

• • blocking

• • learning

If no bridge priority is configured in PVST, which criteria is considered when electing the root bridge?

• • lowest MAC address

• • lowest IP address

• • highest IP address

• • highest MAC address

When the show spanning-tree vlan 33 command is issued on a switch, three ports are shown in the forwarding state. In which two port roles could these interfaces function while in the forwarding state? (Choose two.)

• • alternate

• • designated

• • disabled

• • blocked

• • root

What is the function of STP in a scalable network?

• • It decreases the size of the failure domain to contain the impact of failures.

• • It protects the edge of the enterprise network from malicious activity.

• • It combines multiple switch trunk links to act as one logical link for increased bandwidth.

• • It disables redundant paths to eliminate Layer 2 loops.

What is a characteristic of spanning tree?

• • It is enabled by default on Cisco switches.

• • It is used to discover information about an adjacent Cisco device.

• • It has a TTL mechanism that works at Layer 2.

• • It prevents propagation of Layer 2 broadcast frames.