Ch02-Spanning Tree Protocol Concepts

Question 1

Which IEEE standard describes Spanning Tree Protocol/?

Answer 1

IEEE 802.1D

Question 2

The use of STP prevents 3 common problems…

Answer 2

Broadcast storms, MAC table instability, multiple frame transmission

Question 3

True or false: in the blocking state, ports pass no frames excepts for spanning tree messages?

Answer 3

True

Question 4

True or false: in the blocking state, user frames are forwarded?

Answer 4

False

Question 5

True or false: in the blocking state, a port continues to learn MAC addresses?

Answer 5

False

Question 6

True or false: in the blocking state, a port continues to physically receive frames, but does not act on them

Answer 6

True

Question 7

What is the default priority value of the STP Bridge ID?

Answer 7

32768

Question 8

What is the default IEEE port cost of a 10Mbps Ethernet link?

Answer 8

100

Question 9

What is the default IEEE port cost of a 100Mbps Ethernet link?

Answer 9

19

Question 10

What is the default IEEE port cost of a 1 Gbps Ethernet link?

Answer 10

4

Question 11

What is the default IEEE port cost of a 10Gbps Ethernet link?

Answer 11

2

Question 12

What IOS command is used to support modern IEEE STP port cost values, useful when links fast than 10Gbps are in use?

Answer 12

spanning-tree pathcost method long

Question 13

What is the default value of the STP Hello timer?

Answer 13

2 sec

Question 14

What is the default value of the STP MaxAge timer?

Answer 14

10x Hello timer (20 sec)

Question 15

What is the default value of the STP Forward delay timer?

Answer 15

15 sec

Question 16

List the IEEE 802.1D spanning-tree states

Answer 16

Blocking, Listening, Learning, Forwarding, Disabled

Question 17

List the IEEE 802.1w (Rapid Spanning Tree) states

Answer 17

Discarding, Learning, Forwarding

Question 18

List the IEEE 802.1w Port Roles

Answer 18

Root, Designated, Alternate, Backup, Disabled