What are two characteristics of "store and forward" switching? (Select two answer choices)A．Latency fluctuates regardless of frame. size.B．The switch receives the complete frame. before beginning to forward it.C．Latency through the switch varies with fram

题目

What are two characteristics of "store and forward" switching? (Select two answer choices)

A．Latency fluctuates regardless of frame. size.

B．The switch receives the complete frame. before beginning to forward it.

C．Latency through the switch varies with frame. length.

D．The switch checks the destination address upon receipt of headers.

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参考答案和解析
正确答案：BC
解析：Explanation:
With store-and-forward, the entire frame. is received by the switch before the first bit of the frame. is forwarded. As soon as the incoming switch port receives enough of the frame. to see the destination MAC address, the forwarding decision is made and the frame. is transmitted out the appropriate outgoing port to the destination device. So, each frame. might experience slightly less latency. Store and forward switching may add latency when compared to other switching methods such as cut through, but it can reduce the amount of errors that become forwarded through a network.

Incorrect Answers:
A. The amount of latency that is introduced with this method of switching is dependent on the size of the frame, as the switch must wait to receive the entire frame. before sending it.

D. The switch must wait for the entire frame. before forwarding it on, and not just the headers.
更多“What are two characteristics of "store and forward" switching? (Select two answer choices) ”相关问题

  • 第1题：

    以下对枚举类型名的定义中正确的是______。

    A．enum a={one,two,three};

    B．enum a{on=9,two=-1,three};

    C．enum a={"one","two","three"};

    D．enum a{"one","two","three"};


    正确答案：B
    解析：声明枚举类型用enum开头。例如：enumweekday(sun,mon,tue,wed,thu,fri,sat)；说明；1、在C编译中，对枚单元素按常量处理，同时可以改变他们的值。2、枚举值可以用来做判断比较。3、一个整数不能直接赋给一个牧举变量。

  • 第2题：

    TheONS15216isa32－channelsystem.TheONS15216OADMsarecapableofaddinganddroppingone,two,orfourchannels.HowaretheOADMsprovisionedtoaddanddropspecificchannels?()

    A.TheONS15216OADMcanbeprovisionedtoadd/dropone，two，orfourchannelsviaCiscoTransportManager（CTM）.

    B.TheONS15216OADMconsistsonlyofafour-channelmodule，andthenumberofportsutilizeddetermineswhetheritisaone，two，orfourchannelOADM.

    C.ThreeseparateOADMmodulesareavailableforone，two，andfourchannels.ThewavelengthstobedroppedandaddedareprogrammableviaCiscoTransportManager（CTM）.

    D.TheONS15216OADMconsistsonlyofasingle-channelmodule.Two-channelandfour-channelsupportisavailablebystackingthesingle-channelmodule.

    E.TheONS15216OADMisavailableinone，two，fourchannels.Thereare32single-channelOADMmodules，16two-channelOADMmodules，and8four-channelOADMmodules.


    参考答案：E

  • 第3题：

    About ________ of the workers in the factory were born in the ________.

    A.two-thirds, 1970 B.two-thirds, 1970s C.two-third,1970 D.two-third, 1970s


    正确答案：B

  • 第4题：

    以下对枚举类型名的定义中正确的是______。

    A．enum a={one,two,three}；

    B．enum a{one=9，two=-1,three}；

    C．enum a={"one"，"two"，"three"};

    D．enum a{"one"，"two"，"three"}；


    正确答案：B
    解析：声明枚举类型用enum开头。例如：enum weekday(sun,mon,tue,wed,thu,fri,sat)； 说明：1、在C编译中，对枚举元素按常量处理，同时可以改变他们的值。2、枚举值可以用来做判断比较。3、一个整数不能直接赋给一个枚举变量。

  • 第5题：

    The ONS 15216 is a 32－channel system. The ONS 15216 OADMs are capable of adding and dropping one, two, or four channels. How are the OADMs provisioned to add and drop specific channels?()

    A. The ONS 15216 OADM can be provisioned to add/drop one, two, or four channels via Cisco Transport Manager (CTM).

    B. The ONS 15216 OADM consists only of a four-channel module, and the number of ports utilized determines whether it is a one, two, or four channel OADM.

    C. Three separate OADM modules are available for one, two, and four channels. The wavelengths to be dropped and added are programmable via Cisco Transport Manager (CTM).

    D. The ONS 15216 OADM consists only of a single-channel module. Two-channel and four-channel support is available by stacking the single-channel module.

    E. The ONS 15216 OADM is available in one, two, four channels. There are 32 single-channel OADM modules, 16 two-channel OADM modules, and 8 four-channel OADM modules.


    参考答案：E

  • 第6题：

    12． About_______ of the workers in the factory were born in the __________．

    A． two- thirds;1970

    B． two- thirds ; 1970s

    C． two-third ; 1970

    D． two-third ; 1970s


    正确答案：B
    12．B【解析】句意：工厂里大约2/3的工人出生在20世纪70年代。分数的表达为分子用基数词，分母用序数词，如果分子大于1，则分母要用复数，排除C、D，年代的表达要在年份后加s．故选B。

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