Spanning Tree Protocol Q/A's Flashcards

1
Q

Rapid Per-VLAN Spanning Tree Protocol (RPVST+) prevents routing loops for each what in Spanning Tree Protocol?

A

Individual VLAN instance.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Rapid Per-VLAN Spanning Tree blocks what two states for faster convergence?

A

blocking and listening

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

The root port in Spanning Tree Protocol is directly connected to a?

The root bridge is selected by the highest or lowest path cost?

A

Root Bridge Switch

Lowest path cost

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

The designated port in Spanning Tree Protocol forward frames to what?

A

each LAN-Local area Network

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

The alternate port in Spanning Tree Protocol is the next available what, to the root bridge?

A

backup port

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

The blocking port in Spanning Tree Protocol does what with all frames received on that port?

A

discards

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

In order what are the five transitioning states of Spanning Tree Protocol?

A
Disabled
Blocking
Listening
Learning
Forwarding
Broken
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

In order what are the three transitioning states of RSTP-Rapid Spanning Tree Protocol?

A

Discarding “aka blocking port”
Learning
Forwarding

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

The Bridge Protocol Data Units-BPDU’s contain what type of information frames in Spanning Tree Protocol?

A

spanning tree topology

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

The two things that determine the root bridge switch are the two lowest what?

A

Bridge ID

Priority

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Spanning Tree Protocol takes about how long before port forwarding starts?

A

15 Seconds for Listening and 15 Seconds for Learning (30 seconds)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

The default Bridge Priority Value for Spanning Tree Protocol is?

A

32768

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

When the priority value is tied in Spanning Tree Protocol, what is used instead for the selection process?

A

lowest MAC address

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Is Spanning Tree Protocol a routing protocol and does it perform load balancing?

What are the two main purposes of Spanning Tree Protocol?

A

no

prevent loops + best forwarding path

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

In Spanning Tree Protocol the ports that face away from the Root Bridge are called what type of ports?

A

Designated Ports

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Spanning Tree Protocol sends BPDU’s to/from?

17
Q

The main purpose of Spanning Tree “Root Guard”?

A

Prevent switch from becoming a root bridge

18
Q

The ports on the root bridge are all what type of ports?

A

Designated ports

19
Q

What are the two types of BPDU’s?

A

Configuration BPDU

TCN (Topology Change Notification) BPDU

20
Q

The root path cost is always zero on the root bridge? True/False

21
Q

Root port is selected in what order?

A

lowest path cost
lowest system priority
lowest mac address
lowest port priority

22
Q

What is a P2P port type?

A

port that connects to another network device (PC or Switch)

23
Q

What is P2P edge port type?

A

port that specifies port fast is enabled

24
Q

When root guard is enabled and a superior BPDU is received on a configured port what happens?

A

Port goes into a Err-Disabled state

25
Does Portfast disable TCN Topology Change Notifications for access ports. True/False
True
26
The use of spanning-tree portfast trunk should only be used when? What should this command not be use with?
With ports that are connecting to a single host, ex server with on NIC. switches, bridges, etc
27
What is the purpose of using BPDU filter?
block BPDU's from being transmitted out of a port
28
What is the purpose of STP Loop Guard?
prevent any alternative or root ports from becoming designated ports
29
What role does designated ports have?
forward data downstream to other switches/LANs
30
Why shouldn't loop guard be enabled on portfast-enabled ports?
conflicts with the root/alternative port logic
31
What is Unidirectional Link Detection?
allows (bidirectional) two way monitoring of fiber-optic cables