多选题Which two statements about spanning tree path cost are true？（）AThe path cost can be changed for an interface using the spanning-tree cost commandBThe path cost can be changed for an interface using the stp path-cost commandCThe SPT default path cost de

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多选题

Which two statements about spanning tree path cost are true？（）

The path cost can be changed for an interface using the spanning-tree cost command

The path cost can be changed for an interface using the stp path-cost command

The SPT default path cost depends on the interface speed

The STP default path cost is similar for all interface

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第1题：

By default, which of the following factors determines the spanning-tree path cost?

A．It is the individual link cost based on latency

B．It is the sum of the costs based on bandwidth

C．It is the total hop count

D．It is dynamically determined based on load

E．None of the above

正确答案：B
解析：Explanation:"TheSTPcostisanaccumulatedtotalpathcostbasedontheavailablebandwidthofeachofthelinks."Note:Apathcostvalueisgiventoeachport.Thecostistypicallybasedonaguidelineestablishedaspartof802.1d.Accordingtotheoriginalspecification,costis1,000Mbps(1gigabitpersecond)dividedbythebandwidthofthesegmentconnectedtotheport.Therefore,a10Mbpsconnectionwouldhaveacostof(1,000/10)100.Tocompensateforthespeedofnetworksincreasingbeyondthegigabitrange,thestandardcosthasbeenslightlymodified.Thenewcostvaluesare:Youshouldalsonotethatthepathcostcanbeanarbitraryvalueassignedbythenetworkadministrator,insteadofoneofthestandardcostvalues.IncorrectAnswers:A,D:TheSTPprocessdoesnottakeintoaccountthelatencyorloadofalink.STPdoesnotrecalculatethelinkcostsdynamically.C.HopcountsareusedbyRIProuterstocalculatethecostofaroutetoadestination.TheSTPprocessresidesatlayer2oftheOSImodel,wherehopcountsarenotconsidered.

第2题：

Which two statements about spanning tree path cost are true？（）

A、The path cost can be changed for an interface using the spanning-tree cost command
B、The path cost can be changed for an interface using the stp path-cost command
C、The SPT default path cost depends on the interface speed
D、The STP default path cost is similar for all interface

正确答案:A,C

第3题：

要将交换机100M端口的路径成本设置为25,以下哪个命令是正确的?()

A.Switch(config)#spanning-tree cost 25

B.Switch(config-if)#spanning-tree cost 25

C.Switch(config)#spanning-tree priority 25

D.Switch(config-if)#spanning-tree path-cost 25

参考答案：D

第4题：

Which two statements about an IDS are true？（）

A、The IDS is in the traffic path.
B、The IDS can send TCP resets to the source device.
C、The IDS can send TCP resets to the destination device.
D、The IDS listens promiscuously to all traffic on the network.
E、Default operation is for the IDS to discard malicious traffic.

正确答案:B,D

第5题：

What value is primarily used to determine which port becomes the root port on each nonroot switch in a spanning-tree topology？（）

A、lowest port MAC address
B、port priority number and MAC address
C、VTP revision number
D、highest port priority number
E、path cost

正确答案:E

第6题：

Which command enhances the 802.1D convergence time on ports that are connected to hosts?()

A. spanning-tree backbonefast

B. spanning-tree uplinkfast

C. spanning-tree portfast

D. spanning-tree cost512

参考答案：C

第7题：

You are about to migrate a customer network to use a VSS. Which of these statements is true about a VSS？（）

A、 The VSS switch must be the root bridge for all VLANs and is automatically designated
B、 The VSS switch is defined in RFC 4318 as a managed object
C、 The PAgP+ or LACP protocols are used to maintain the operational state of the VSS devices
D、 A VSS interoperates with a virtual port channel
E、 The 802.1Q or ISL protocols are used to maintain the operational state of the VSS devices
F、 A VSS increases the size of the spanning-tree domain

正确答案:C

第8题：

In the following statements about graph operations，which one is NOT correct?

A．Finding critical path is an operation on directed graph

B．Finding critical path is an operation on undirected graph

C．Spanning tree of a graph may not be unique

D．Minimum spanning tree of a graph may not be unique

正确答案：B

第9题：

Which two statements are true about Unicast Reverse Path Forwarding Loose Mode？（）

A、It is used in multihome network scenarios.
B、It can be used with BGP to mitigate DoS and DDoS.
C、It does not need to have CEF enabled.
D、It is enabled via the interface level command ip verify unicast reverse-path.
E、It cannot be used with "classification" access lists.

正确答案:A,B

第10题：

Which two statements are true about L2TP tunnels?（） (Choose two.)

A、Traffic is clear text
B、Traffic is encrypted
C、They are initiated by the LNS
D、They are initiated by the LAC

正确答案:A,D

Which two statements about spanning tree path cost are true？

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