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Nguyen Khac Quyet - Take Exam

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1 IEEE 802.1w RSTP defines which of the following port states ?

Listening, Learning, Forwarding, Blocking, Disabled

Learning, Forwarding, Discarding

Learning, Active, Block

Listening, Forwarding, Active, Blocking

2 Broadcast storms can:

Disrupt the network by absorbing all bandwidth capacity

Sometimes be useful depending on the circumstance

Not interfere with your bandwidth

Be an indication that you need more bandwidth

3 The root bridge will have a priority of and a secondary priority of when using the “set spantree root” command

8192, 16384

512, 1024

1024, 2048

16384, 32768

4 Once STP has completed running its algorithm, which of the following states could a port be in? Choose all the correct answers

Blocking

Listening

Forwarding

Disabled

5 If you have a port speed set for auto-negotiation:

you must set the duplexing manually

you won’t be able to manually set the duplexing

the port will not dynamically configure itself with a speed that is supported by the connecting device

the port only supports one speed

6 From the following “show spantree vlan-number” output, how can you tell if you’re looking at the data from the root bridge? Choose two show spantree 2 VLAN 2 Spanning tree enabled Designated Root 00-50-74-7f-4a-00 Designated Root Priority 32768 Designated Root Cost 0 Designated Root Port 1/0 Root Max Age 20 sec Hello Time 2 sec Forward Delay 15 sec Bridge ID MAC ADDR 00-50-74-7f-4a-00 Bridge ID Priority 32768 Rest of output omitted

The Bridge ID Priority and the Designated Root Priority are the same

The Designated Root and the Bridge ID MAC ADDR are the same

The Root Max Age is more than 15 seconds

The Designated Root Cost is zero (0)

7 The spanning tree protocol decides which port to disable based on three things What are they?

Port cost

Port priority

Port distance

MAC address

8 "How does a non-Root switch choose its Root Port?

It chooses the port with the lowest cumulative Root Path Cost to the Root Bridge

It chooses the port with the highest cumulative Root Path Cost to the Root Bridge

The port receives an inferior BPDU from a neighboring switch on a shared LAN segment

The port receives a BPDU announcing a higher Root Path Cost from a neighboring switch on a shared LAN segment

9 As your network grows, it is important to:

Add as many routers as possible, which will give redundancy

Make sure that the root bridge selected will be the most optimal for your network

Limit the number of designated roots in the network

Set up eight-port EtherChannels, if possible

10 The designated bridge on each LAN segment is elected using:

the switch within the segment with the lowest accumulated path cost to the root bridge

the switch within the segment with the highest accumulated path cost to the root bridge

the switch within the segment with the lowest bridge identifier or lowest MAC address

the switch within the segment with the highest bridge identifier

11 On a Catalyst switch, what happens when a port is attached or removed and the spanning tree is turned on?

The ports go into listening mode for 10 seconds

The ports go into learning mode for 15 seconds

The ports go into blocking mode for 15 seconds

The ports go into sleeping mode for 20 seconds

12 Fast EtherChannels:

use two line modules that act as a single module

is configured as separate instances of spanning tree per link

treats two links as a single spanning tree logical link

use gigabit Ethernet

13 Spanning Tree Algorithm is used in bridged or switched LANs to:

Identify destinations for multicasts

Flood segments with frames from unknown sources

Identify the segments connected to the bridge or switch

Flood segments with frames to unknown destinations

Avoid broadcast storms by eliminating loops in the network

14 Loops within one spanning tree can:

cause problems with other spanning trees

do not effect other spanning trees

Distribute root bridge information

Distribute designated bridge information

15 Spanning Tree Protocol guarantees a loop-free environment and an optimal configuration

True

False

16 How would you reduce BPDU traffic when there is only one root bridge?

Increase the Hello Time timer

Decrease the Max Age timer

Add an additional root bridge

Set the port channel

17 The root bridge is elected using:

the lowest accumulated path cost to the root port

the highest accumulated path cost to the root port

the lowest bridge identifier or lowest MAC address

the highest bridge identifier

18 If a bridge receives BPDUs from multiple ports, what does this tell you?

That there is a preferred path and also a redundant path to the root port

That there are multiple paths to the root bridge and one of them will have to be disabled

That there are multiple paths to the root bridge and both of them will have to be disabled

That there are multiple paths to the root bridge and both of them should be enabled

19 The root ports on each switch are elected using:

the port on each switch with the lowest accumulated path cost to the root bridge

the port on each switch with the highest accumulated path cost to the root bridge

the port on each switch with the lowest bridge identifier or lowest MAC address

the port on each switch with the highest bridge identifier

20 It is highly recommended that UplinkFast only be configured on:

Distribution switches

Leaf switches

Core Switches

Both Access and Distribution switches

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