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CCNA 3 - Module 5

1. Which two statements are true about the default operation of STP in a Layer 2

switched environment that has redundant connections between switches? ( hoose

two.!" The root switch is the switch with the hi#hest speed ports.

" $ecisions on which port to bloc% when two ports have e&ual cost depend on the

port priority and identity.

" 'll trun%in# ports are desi#nated and not bloc%ed.

" oot switches have all ports set as root ports.

" )on"root switches each have only one root port.

2. Which two statements describe the *+$s used in a spannin# tree topolo#y?( hoose two.!

" They are sent out by the root brid#e only after the inferior *P$,s are sent.

" They consist of a brid#e priority and -' address.

" nly the root brid#e will send out a *+$.

" They are used by the switches in a spannin# tree topolo#y to elect the root brid#e.

" The switch with the fastest processor will have the lowest *+$.

/. +n which two ways is the information that is contained in *P$,s used byswitches? ( hoose two.!

" to ne#otiate a trun% between switches

" to set the duple0 mode of a redundant lin%

" to identify the shortest path to the root brid#e

" to prevent loops by sharin# brid#in# tables between connected switches

" to determine which ports will forward frames as part of the spannin# tree

. Which two actions does an STP ed#e port ta%e if it receives a *P$,? ( hoosetwo.!

" immediately loses its ed#e status

" inhibits the #eneration of a T )

" #oes immediately to a learnin# state

" disables itself

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" becomes a normal spannin#"tree port

. efer to the e0hibit. 'll switches in the networ% have empty -' tables. STP has

been disabled on the switches in the networ%. 3ow will a broadcast frame that is

sent by host P 1 be handled on the networ%?

" Switch SW1 will bloc% the broadcast and drop the frame.

" Switch SW1 will forward the broadcast out all switch ports4 e0cept the ori#inatin#

port. This will #enerate an endless loop in the networ%.

" Switch SW1 will forward the broadcast out all switch ports4 e0cept the ori#inatin#

port. 'll hosts in the networ% will replay with a unicast frame sent to host P 1.

" Switch SW1 will forward the traffic out all switch ports e0cept the ori#inatin# port

as a unicast frame. 'll hosts in the networ% will replay with a unicast frame sent to

switch SW1.

5. Which two items are true re#ardin# the spannin#"tree portfast command?

( hoose two.!

" Port6ast is isco proprietary.

" Port6ast can ne#atively effect $3 P services.

" Port6ast is used to more &uic%ly prevent and eliminate brid#in# loops.

" 7nablin# Port6ast on trun%s that connect to other switches improves

conver#ence.

" +f an access port is confi#ured with Port6ast4 it immediately transitions from a

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bloc%in# to a forwardin# state.

8. efer to the e0hibit. Server sends an ' P re&uest for the -' address of its

default #ateway. +f STP is not enabled4 what will be the result of this ' P re&uest?

" outer91 will drop the broadcast and reply with the -' address of the ne0t hop

router.

" Switch9' will reply with the -' address of the outer91 7: interface.

" Switch9' and Switch9* will continuously flood the messa#e onto the networ%.

" The messa#e will cycle around the networ% until its TTL is e0ceeded.

;. What is the first step in the process of conver#ence in a spannin# tree topolo#y?

" election of the root brid#e

" bloc%in# of the non"desi#nated ports

" selection of the desi#nated trun% port

" determination of the desi#nated port for each se#ment

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1:. efer to the e0hibit. The spannin#"tree port priority of each interface is at the

default settin#. The networ% administrator enters the spannin#"tree vlan 1 root

primary command on S . What is the effect of the command?

" Spannin# tree bloc%s =i :>1 on S/.

" =i :>2 on S/ transitions to a root port.

" Port priority ma%es =i :>2 on S1 a root port.

" S is already the root brid#e4 so there are no port chan#es.

11. What two features of the Spannin#"Tree Protocol contribute to the time it ta%es

for a switched networ% to conver#e after a topolo#y chan#e occurs? ( hoose two.!

" the ma0"a#e timer

" the spannin#"tree hold down timer

" the forward delay

" the spannin#"tree path cost

" the bloc%in# delay

12. +n which STP state does a port record -' addresses but not forward user

data?

" bloc%in#

" Learnin#

" disablin#

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" listenin#

" forwardin#

1/. Which three statements are accurate re#ardin# STP and STP? ( hoose three.!

" STP uses a faster al#orithm to determine root ports.

" STP introduced the e0tended system +$ to allow for more than :

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15. efer to the e0hibit. What can be determined from the output shown?

" Two hosts communicatin# between ports 6a :>2 and 6a :> have a cost of /;.

" The priority was statically confi#ured to identify the root." STP is disabled on this switch.

" The timers have been altered to reduce conver#ence time.

18. Which two criteria does a switch use to select the root brid#e? ( hoose two.!

" brid#e priority

" switchin# speed

" number of ports

" base -' address" switch location

" memory si@e

1;. What three lin% types have been defined for apid Spannin#"Tree Protocol?

( hoose three.!

" Shared

" end"to"end

" ed#e"type" boundary"type

" point"to"many

" point"to"point

1

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port elected for every switched 7thernet L') se#ment?

" alternate

" bac%up

" $esi#nated

" root

2:. When P STA was developed4 the *rid#e +$ was modified to include which

information?

" brid#e priority

" -' address

" protocol

" L') +$