Unit 5 Module Quiz - STP

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.

Extended System ID

Allowed One Root Bridge per VLAN.

BDPU Gaurd

Any BDPUs on a access port shuts down the port on a PortFast enabled port.

What is an accurate description of redundancy?

Designing a network to use multiple paths between switches to ensure there is no single point of failure.

After the election of the root bridge has been completed, how will switches find the best paths to the root bridge?

Each switch will analyze the sum of all port costs to reach the root and use the path with the lowest cost.

STP Step 4:

Elect Alternate Ports.

STP Step 3:

Elect Designated Ports.

STP Step 1:

Elect Root Bridge

STP Step 2:

Elect Root Ports

How often are BPDUs sent out during bootup?

Every 2 Seconds.

Which port state will switch ports immediately transition to when configured for PortFast?

Forwarding

Which three port states are used by Rapid PVST+?

Learning, Discarding, Forwarding

When PVST is running over a switched network, which port state can participate in BPDU frame forwarding based on BPDUs received, but does not forward data frames?

Listening

How are root ports selected?

Lowest cost to root bridge.

What value determines the root bridge when all switches connected by trunk links have default STP configurations?

MAC address

PortFast

Makes port block to forward state immediately.

What is one way to correct a spanning tree failure?

Manually remove redundant links in the switched network.

Which is the default STP operation mode on Cisco Catalyst switches?

PVST+

PVST

Per-VLAN Spanning Tree

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.)

PortFast, edge port

Creator of STP algorithim?

Radia Perlman

Bridge Priority

Ranges from 0 - 61440 and increments of 4096.

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

Root Port

Which two statements describe a switch port that is configured with PortFast?

The switch port immediately transitions from blocking to the forwarding state; The switch port should never receive BPDUs.

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

VLAN ID

An administrator is troubleshooting a switch and wants to verify if it is a root bridge. What command can be used to do this?

show spanning-tree

Path Cost Formula

19 * (# of switches passed + 1)

Current IEEE STP Standard is:

802.1w-2004