Quiz LAN Switching STP

28672

A company's network has six interconnected Layer 2 switches. Currently, all switches are using the default bridge priority value. Which value can be used to configure the bridge priority of one of the switches to ensure that it becomes the root bridge in this design? 28672 1 32768 34816 61440

61440

A set of switches is being connected in a LAN topology. Which STP bridge priority value will make it least likely for the switch to be selected as the root? 65535 32768 4096 61440

designated port

A switch is configured to run STP. What term describes a non-root port that is permitted to forward traffic on the network? disabled designated port root port alternate port

root port

A switch is configured to run STP. What term describes the switch port closest, in terms of overall cost, to the root bridge? alternate port root port disabled designated port

root port

A switch port that has the lowest cost to reach the root bridge will be assigned the role of: disabled port non-designated port designated port root port

4096

A switch's STP priority can be configured in increments of ______. 1 4096 256 2048

The switch's MAC address.

All STP enabled switches are assigned a bridge priority of 32768 by default. Without administrative intervention, what is used to break the tie and select a root bridge? The switch's IP address. The switch's MAC address. The switch's up-time - longest wins. The switch's up-time - shortest wins.

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

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. Each switch determines the best path to forward traffic. Each switch determines what port to block to prevent a loop from occurring. All the switches send out BPDUs advertising themselves as the root bridge.

Trunk 3

Refer to the exhibit. All links between the switches have a cost of 4. Which trunk link will not forward any traffic after the root bridge election process is complete? Trunk 2 Trunk 1 Trunk 3 Trunk 4

SW2

Refer to the exhibit. Based on the topology below, which switch will be elected to be the root bridge? W1 and SW2 SW2 SW3 SW1

The role of the ports in all VLANs. The root bridge BID.

To obtain an overview of the spanning tree status of a switched network, a network engineer issues the show spanning-tree command on a switch. Which two items of information will this command display? (Choose two.) The status of native VLAN ports. The number of broadcasts received on each root port. The role of the ports in all VLANs. The IP address of the management VLAN interface. The root bridge BID.

VLAN ID

What additional information is contained in the 12-bit extended system ID of a BPDU? MAC address VLAN ID IP address port ID

Broadcast frames are transmitted indefinitely. The MAC address table becomes unstable.

What are two drawbacks to turning spanning tree off and having multiple paths through the Layer 2 switch network? (Choose two.) Broadcast frames are transmitted indefinitely. Port security becomes unstable. The switch acts like a hub. The MAC address table becomes unstable. Port security shuts down all of the ports that have attached devices.

It is enabled by default on Cisco switches.

What is a characteristic of spanning tree? It is used to discover information about an adjacent Cisco device. 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 disables redundant paths to eliminate Layer 2 loops

What is the function of STP in a scalable network? 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 decreases the size of the failure domain to contain the impact of failures. It disables redundant paths to eliminate Layer 2 loops

prevents Layer 2 loops

What is the purpose of the Spanning Tree Protocol (STP)? prevents Layer 2 loops prevents routing loops on a router creates smaller collision domains allows Cisco devices to exchange routing table updates creates smaller broadcast domains

the path cost

What is the value used to determine which port on a non-root bridge will become a root port in a STP network? the path cost the VTP revision number the highest MAC address of all the ports in the switch the lowest MAC address of all the ports in the switch

bridge priority

What term specifies a field that has a default value of 32,768 and is the initial deciding factor when electing a root bridge, on a switch that is configured to run STP? bridge ID bridge priority extended system ID MAC Address

bridge priority + extended system ID +MAC address

What three elements of a switch running STP are used to create the bridge ID? bridge priority + extended system ID +MAC address extended system ID + MAC address + Port number MAC address + bridge priority + extended system ID extended system ID + bridge priority + Hello Time

designated root

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 root alternate disabled blocked