名词解释题SWITCH：（）

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SWITCH：（）

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第1题：

A Ezonexam Ethernet switch receives a unicast frame. with a destination MAC that is listed in the switch table. What will this switch do with the frame?

A. The switch will forward the frame. to a specific port

B. The switch will forward the frame. to all ports except the port on which it was received

C. The switch will return a copy of the frame. out the source port

D. The switch will not forward unicast frames

E. The switch will remove the destination MAC from the switch table

F. None of the above.

正确答案：A
A 解析：Explanation:
How Does the Switch Find Host MACs?
Let's use the diagram below to help us understand how address learning process takes place.

Let's assume that we have just powered on the switch. It has nothing in its MAC table. We connect the cables from the hosts on the switch interfaces as shown in the diagram. Host A initiates a connection towards Host D, and the following takes place:
1. Host A (interface fe0/0) sends a frame. to Host D (MAC address:0000.43c5.334c).

2. The switch inspects the Source Address in the frame. and notes in its table the MAC address of Host A along with the Interface number from which the frame. originated.

3. The switch inspects the Destination Address in the frame. Since it does not have Hosts D MAC address in its table, it constructs a broadcast frame. and forwards out all interfaces except the interface from where the original frame. arrived.

4. Host D identifies itself as the expected recipient and responds back to Host A. The switch receives the respond frame. on interface fe0/11 and places the SA in its table along with the interface number where the frame. came from.

5. From now on, further communication between the two hosts will be switched to the appropriate interfaces based on the MAC tables entries.

This process takes place every time a new host is attached on the switch and initiates traffic. The switch tries to keep its MAC table up-to-date, therefore if some hosts do not initiate traffic for a certain amount of time, the switch removes them from its table and reinserts them when they begin sending traffic.

第2题：

WhichthreeresourceplanparametersareusedtoenableAutomaticConsumerGroupSwitchingtoestimatejobexecutiontimesautomatically,andtoperformaswitchtoalowpriorityconsumergroupbeforetheyareinitiated?()

A.SWITCH_TIME

B.SWITCH_GROUP

C.MAX_SESS_POOL

D.SWITCH_ESTIMATE

参考答案：A, B, D

第3题：

交换机当前状态处于局部配置模式的是()。

A、switch>

B、switch#

C、switch(config-if)#

D、switch(config)#

正确答案：B

第4题：

Refer to the exhibit. What switch proves the spanning－tree designated port role for the network segment that services the printers?()

A.Switch1

B.Switch2

C.Switch3

D.Switch4

参考答案：C

第5题：

Whichofthefollowingcommandscanbeissuedwithoutinterferingwiththeoperationofloopguard?()

A.Switch（config-if）#spanning-treeguardroot

B.Switch（config-if）#spanning-treeportfast

C.Switch（config-if）#switchportmodetrunk

D.Switch（config-if）#switchportmodeaccess

参考答案：C

第6题：

若a和b均是整型变量并已正确赋值，则正确的switch语句是( )。

A．switch (a+b)；

B．switch (a+b * 3.0) {......}{.......}

C．switch a

D．switch(a% b) {......}{......}

正确答案：D

第7题：

AutomaticConsumerGroupSwitchingisanimportantnewfeatureoftheDatabaseResourceManager.Whichthreeplandirectiveparametersareusedtocontrolthisfeature?()

A.SWITCH_TIME

B.SWITCH_GROUP

C.MAX_SESS_POOL

D.SWITCH_ESTIMATE

参考答案：A, B, D

第8题：

若a和b均是整型变量并已正确赋值，正确的switch语句是

A．switch(a+b)；{……}

B．switch(a+b*3.0){……}

C．switch a{……}

D．switch(a％b){……}

正确答案：D
解析：switch后的括号部分只能返回这几种类型的值：int，byte，short和char。选项A)switch(a+b)；中多了一个“；”号，注意观察。选项B)switch(a+b*3．0)中括号的值不能为浮点型。选项C)switcha中switch后的判断部分必须用括号括起来。

第9题：

AVTPdomainhassixactiveVLANs.Withoutnotice,allVLANsexceptVLAN1fail.Justpriortothefailure,Switch2wasaddedtothenetwork.WhichthreeissuesonSwitch2couldbethecause?()

A.Switch2isconfiguredforonlyVLAN1

B.Switch2isaVTPserverinadifferentdomain

C.Switch2isaVTPserverintheCompanydomain

D.Switch2isnotaVTPdomain.

E.Switch2hasalowerVTPconfigurationrevisionnumberthanthecurrentVTPrevision

F.Switch2hasahigherVTPconfigurationrevisionnumberthanthecurrentVTPrevision

参考答案：A, C, F

第10题：

What will an Ethernet switch do if it receives a unicast frame with a destination MAC that is listed in the switch table()。

A.The switch will not forward unicast frames.

B.The switch will forward the frame to a specific port.

C.The switch will return a copy of the frame out the source port.

D.The switch will remove the destination MAC from the switch table.

E.The switch will forward the frame to all ports except the port on which it was received.

参考答案：B

SWITCH：（）

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