Spanning Tree Protocol

Question 1

How Many different BPDU types are there?

A) One
B) Two
C) Three
D) Four

Answer 1

Two

Question 2

What attributes are used to elect a root bridge?

A) Switch port priority
B) Bridge Priority
C) Switch serial number
D) Path Cost

Answer 2

Bridge Priority

Question 3

The original 802.1D specification assigns what value to a 1 Gbps Interface?

A) 1
B) 2
C) 4
D) 19

Answer 3

4

Question 4

All of the ports on a root bridge are assigned what role?

A) Root port
B) Designated port
C) Superior port
D) Master port

Answer 4

Designated Port

Question 5

Using default settings, how long does a port stay in the listening state?

A) 2 seconds
B) 5 seconds
C) 10 seconds
D) 15 seconds

Answer 5

15 Seconds

Question 6

Upon receipt of a configuration BPDU with the topology change flag set, how do the downstream switches react?

A) By moving all ports to a blocking state on all switches
B) By flushing out all MAC addresses from the MAC address table
C)By temporarily moving all non-root ports to a listening state
D) By flushing out all old MAC Addresses from the MAC address table
E) By updating the Topology Change version flag on the local switch database

Answer 6

By flushing out all old MAC addresses from the MAC address table

Question 7

Which of the following are not RSTP port states?

A) Blocking
B) Listening
C) Learning
D) Forwarding

Answer 7

Blocking
Listening

Question 8

T / F - In a large Layer 2 switch topology, the infrastructure must fully converge before any packets can be forwarded.

Answer 8

False

Question 9

T / F - In a large Layer 2 switch topology that is running RSTP, the infrastructure must fully converge before any packets can be forwarded.

Answer 9

False

Question 10

A network port that connects to the root bridge or an upstream switch in the spanning-tree topology

Answer 10

Root Port

Question 11

A network port that receives and forwards BPDU frames to other switches.

Answer 11

Designated Port

Question 12

A network port that is nor forwarding traffic because of STP calculations

Answer 12

Blocking Port

Question 13

T/F - The root bridge is the least important switch in the Layer 2 topology.

Answer 13

False - It is the most important switch.

Question 14

T/F - The root bridge’s ports are all in a listening state.

Answer 14

False - they’re all in a forwarding state.

Question 15

T/F - The root bridge’s ports are all designated ports.

Answer 15

True

Question 16

__________ is the network packet used for switches to identify a hierarchy and notify of changes in the topology

Answer 16

BPUD (Bridge Protocol Data Unit)

Question 17

__________ is the type of BPDU used to identify the root bridge, root ports, designated ports, and blocking ports.

Answer 17

Configuration BPDU

Question 18

__________ is the type of BPDU used to communicate changes in the layer 2 topology to other switches.

Answer 18

TCN (Topology Change Notification) BPDU

Question 19

The combined cost for a specific path toward the root switch

Answer 19

Root Path Cost

Question 20

This 4-bit value indicates the preference for a switch to be the root bridge.

Answer 20

System Priority

Question 21

This 12-bit value indicates the VLAN that the BPDU correlates to.

Answer 21

System ID Extension

Question 22

This is a combination of the root bridge system MAC address, system ID extension, and system priority of the root bridge

Answer 22

Root Bridge Identifier

Question 23

This is a combination of the local switch’s bridge system MAC address, system ID extension, and system priority of the local bridge.

Answer 23

Local Bridge Identifier

Question 24

The maximum length of time that passes before a bridge port saves its BPDU information.

Answer 24

Max Age

Question 25

T/F - The default Max Age is 20 seconds.

Answer 25

True

Question 26

The time that a BPDU is advertised out of a port.

Answer 26

Hello Time

Question 27

T/F - The default value of the Hello Timer is 2 seconds

Answer 27

True

Question 28

The amount of time that a port stays in a listening and learning state.

Answer 28

Forward Delay

Question 29

T/F - the default value for the Forward Delay is 15 seconds

Answer 29

True

Question 30

Which of the following are RSTP port types?

A) Root Port
B) Designated Port
C) Alternate Port
D) Backup Port
E) All of the above

Answer 30

All of the Above

Question 31

__________ is the RSTP port at the edge of the network where hosts connect to the Layer 2 topology with one interface and can’t create a loop.

Answer 31

Edge Port

Question 32

__________ is a RSTP port that has received a BPDU

Answer 32

Non-Edge Port

Question 33

__________ is a RSTP port that connects to another RSTP switch with full duplex.

Answer 33

Point-to-Point Port