CCNA 5-6

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

• VLAN ID
• IP address
• MAC 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?

• All the switches send out BPDUs advertising themselves as the root bridge.
• Each switch determines the best path to forward traffic.
• Each switch with a lower root ID than its neighbor will not send BPDUs.
• 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?

• disabled port
• alternate
• root port
• designated 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.)

• edge port
• PortFast
• PVST+
• bridge ID
• extended system ID

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

• cost
• MAC address
• extended system ID
• bridge priority
• IP address

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

• blocking
• learning
• forwarding
• listening
• disabled

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

• lowest IP address
• highest MAC address
• highest IP address
• lowest 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.)

• designated
• disabled
• root
• alternate
• blocked

11. What is the function of STP in a scalable network?

• It combines multiple switch trunk links to act as one logical link for increased bandwidth.
• It disables redundant paths to eliminate Layer 2 loops.
• It protects the edge of the enterprise network from malicious activity.
• It decreases the size of the failure domain to contain the impact of failures.

12. What is a characteristic of spanning tree?

• It has a TTL mechanism that works at Layer 2.
• It is enabled by default on Cisco switches.
• It prevents propagation of Layer 2 broadcast frames.
• It is used to discover information about an adjacent Cisco device.