Two devices on an Ethernet segment sent frames at the same time causing a collision. Which two statements are true?()A. Both devices stop transmitting, wait a random period of time, verify the wire is idle, and re- transmit.B. The device with the lowest M

题目
Two devices on an Ethernet segment sent frames at the same time causing a collision. Which two statements are true?()

A. Both devices stop transmitting, wait a random period of time, verify the wire is idle, and re- transmit.

B. The device with the lowest MAC address is permitted to retransmit first.

C. The device with the lowest MAC address sends a jam signal to notify all other devices of the collision.

D. Both devices send a jam signal to notify all other devices of the collision.

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参考答案和解析
参考答案：A, D
更多“Two devices on an Ethernet segment sent frames at the same time causing a collision. Which two statements are true?() ”相关问题

  • 第1题：

    The professor asked us to write a _____________ report.

    A、two-hundreds-words

    B、two-hundreds-word

    C、two-hundred-words

    D、two-hundred-word


    参考答案：D

  • 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{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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