CCNA 2 MOD 5-6

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

• MAC address

• VLAN ID

• IP address

• port ID

2. 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.

3. 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

• disable port

4. 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+

5. Which three components are combined to form a bridge ID?

• extended system ID

• cost

• IP address

• bridge priority

• MAC address

7. 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

8. 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

10. 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

11. 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.

12. 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.