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More than one ___________ dismissed.
A. have beenB. has beenC. wereD. has
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下列对随机接入技术CSMA的描述不正确的是()。A、CSMA是对ALOHA的改进B、CSMA分为坚持CSMA和非坚持CSMAC、CSMA在发送数据的过程中监听信道D、CSMA不能完全消除冲突
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随机多址技术包括()。A、ALOHA协议和时隙ALOHAB、载波侦听多址(CSMA)C、预约随机多址D、全部
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802.11标准分布式协调功能中使用的媒体接入方法是()A. CSMA/CAB. CSMA/CDC. CRCD. ALOHA
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IEEE 802.3标准中使用的媒体访问控制方式是A．Token Ring B．Token BusC．CSMA/CD D．ALOHA
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IEEE802.3标准中使用的介质（媒体）访问控制方式是（)。A.CSMA/CDB.Token RingC.Token BusD.ALOHA
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在VSAT网络中,TDMA方式下,最大信道利用率可达80%的是如下哪一种?()
A.S-ALOHA（时隙—ALOHA.方式B.R-ALOHA（预约—ALOHA.方式C.StreAm（数据流）方式D.AA.TDMA（自适应—时隙分配）方式
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R－ALOHA方式是指().
A.在ALOHA信道上开一个预约时隙B.时隙ALOHA方式C.自适应调整TDMA方式D.纯随机方式
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CSMA, although more efficient than ALOHA or slotted ALOHA, still has one glaring inefficiency. If the medium is busy, the station will wait for a random amount of time. When two frames collide, the medium remains （ ） for the duration of transmission of both damaged frames. The use of random delays reduces the probability of（ ）. For（ ）frames, compared to propagation time, the amount of wasted capacity can be considerable. This waste can be reduced if a station continues to listen to the medium while（ ）.The maximum utilization depends on the length of the frame and on the（请作答此空） time; the longer the frames or the shorter the propagation time，the higher the utilization.A.propagation
B.transmission
C.colliding
D.listening
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CSMA, although more efficient than ALOHA or slotted ALOHA, still has one glaring inefficiency. If the medium is busy, the station will wait for a random amount of time. When two frames collide, the medium remains （请作答此空） for the duration of transmission of both damaged frames. The use of random delays reduces the probability of（ ）. For（ ）frames, compared to propagation time, the amount of wasted capacity can be considerable. This waste can be reduced if a station continues to listen to the medium while（ ）.The maximum utilization depends on the length of the frame and on the（ ） time; the longer the frames or the shorter the propagation time，the higher the utilization.A.convenient
B.inconvenient
C.usable
D.unusable
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Although Wales has been united with England for more than 400 years,the Welsh has kept alive（）.Atheir own languageBtheir own literatureCtheir own traditionDAll of the above
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卫星通信信道随机分配（RA）主要有（）。A、纯ALOHA方式B、时隙ALOHA方式C、预约ALOHA方式D、频带ALOHA方式
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时隙ALOHA信道利用率与纯ALOHA相比，（）。A、时隙ALOHA高B、时隙ALOHA低C、相同D、无法比较
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S-ALOHA信道利用率比P-ALOHA大（）倍。A、1B、1.5C、2D、2.5
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纯ALOHA和时分ALOHA相比较，哪一个时延更小？为什么？
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预约ALOHA是（）A、P-ALOHAB、S-ALOHAC、C.ALOHAD、R-ALOHA
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802.3标准中使用的媒体访问控制方式是（）。A、Token RingB、Token BusC、CSMA/CDD、ALOHA
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Although Australia has a large area,（）of the continent is desert or semi-desert.A、one thirdB、two thirdsC、halfD、more than half
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可插入多行注释的 JavaScript 语法是？（）A、 /*This comment has more than one line*/ B、 //This comment has more than one line// C、 !--This comment has more than one line--
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R-ALOHA方式是指（）.A、在ALOHA信道上开一个预约时隙B、时隙ALOHA方式C、自适应调整TDMA方式D、纯随机方式
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单选题预约ALOHA是（）A
P-ALOHAB
S-ALOHAC
C.ALOHAD
R-ALOHA
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单选题R-ALOHA方式是指（）.A
在ALOHA信道上开一个预约时隙B
时隙ALOHA方式C
自适应调整TDMA方式D
纯随机方式
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问答题简述CSMA多址协议与ALOHA多址协议的区别与联系。
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单选题可插入多行注释的 JavaScript 语法是？（）A
/*This comment has more than one line*/ B
//This comment has more than one line// C
!--This comment has more than one line--
考题
问答题纯ALOHA和时分ALOHA相比较，哪一个时延更小？为什么？