Chapter 3 - Ccnp Switch Implementing Spanning Tree

Front 1

What IEEE Standard defines RSTP?

Back 1

802.1w

Front 2

What IEEE Standard defines MSTP?

Back 2

802.1s

Front 3

Name the port rolls for STP.

Back 3

Root Port
Designated
Non Designated (Blocking)
Disabled

Front 4

Name STP Port states

Back 4

Blocking
Listening
Learning
Forwarding
Disabled.

Front 5

What is STP Port Cost for 100 meg link?

Back 5

19

Front 6

What is STP Port Cost for 1 gig link?

Back 6

4

Front 7

STP port cost for 10 gig link?

Back 7

2

Front 8

Name RSTP Port States

Back 8

Discarding
Learning
Forwarding

Front 9

Name RSTP Port Roles

Back 9

Root
Designated
Alternate
Backup

Front 10

What state is a port put into once a BPDU is detected on a port which has bpdu filtering enabled?

Back 10

Err Disable

Front 11

What state will Loopguard put a port into.

Back 11

Loop inconsistent

Front 12

What state will root guard cause a port to go into?

Back 12

Blocking...

Front 13

True of False is fine to enable Loop guard on all ports in an architecture?

Back 13

True - "spanning-tree loop guard default"

Front 14

Name the two modes of UDLD

Back 14

Normal Mode
Aggressive Mode

Front 15

UDLD -Normal Mode- causes what to happen with UDL is detected?

Back 15

Log the error

Front 16

UDLD Aggressive mode cause wha to happen when it detects a UDL ?

Back 16

Puts the switch port into Err Disable.

Front 17

Discuss 2 benefits that spanning-tree port-fast (or RSTP edge port type) provide.

Back 17

- Skip the forward delay to bring port active
- Topology change does not generate TCN BPDU

Front 18

What happens once UplinkFast has switched to its alternate port.

Back 18

Floods multicast packets out alternate port to populate cam table.

Front 19

How much time is saved by using backbone fast?

Back 19

20 seconds - removes the need for a switch to wait max age time for a bpdu due to upstream topology transition.

Front 20

True or False - Edgeports / port-fast ports will always will never change their port type.

Back 20

False - Once BPDU is received on these ports the port will be move to a normal port.

Front 21

What port type in RSTP can make use of rapid / sync convergence?

Back 21

PTP-Designated ports

Front 22

In RSTP what happens when primary root port goes down.

Back 22

Alternate port is selected for use; if not switch declares itself root and begins synchronization.

Front 23

What is the RSTP synchronization?

Back 23

Feed back loop

Front 24

What does RSTP TCN tell switches to do?

Back 24

Immediately dump CAM table.

Front 25

STP Port Cost for 10 Meg link

Back 25

100

Front 26

How do you designate an "Edge Port" in RTSP

Back 26

utilize the spanning-tree portfast command on the interface.

Front 27

Difference between an Alternate and Backup port as defined in RTSP

Back 27

Alternate Port = different/alternate less desirable path to the root bridge. RECEIVES useful BPDU's from another bridge to keep its state.

Backup = different/backup path to a shared segment. The bridge receives useful BPDU's from itself! to stay in the discarding state.

Front 28

How does RSTP detect legacy 802.1d switches

Back 28

By BPDU version.

RSTP uses version 2
STP uses version 1

Front 29

What defines a "Shared Port" in RSTP

Back 29

10 half duplex connections.

Front 30

Full duplex links are labeled as what in RSTP

Back 30

PTP Links

Front 31

What type BPDU's does the root bridge send out in 802.1d

Back 31

TC BPDU

Front 32

What is the default hello time in RSTP ?

Back 32

2 Seconds

Front 33

What causes RSTP to converge?

Back 33

3 missed BPDU's

Front 34

Explain RSTP proposal process

Back 34

Upsteam goes through feedback process with down stream switches. Once downstream agrees and provides feedback for root port. It moves allports to discarding and starts proposal downstream

Front 35

What standard defines CST (Common Spanning Tree)

Back 35

802.1q