CCNA 2 v7: Modules 5 – 6: Redundant Networks Exam

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?

• 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

• MAC address

• bridge priority

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

• Blocking

• Listening

• Learning

• Forwarding

• Disabled

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?

• 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.