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46801
一个48端口的交换机的冲突域和广播域的个数分别是()。
46802
在基带Ethernet中,假设站点发送数据帧所需的时间为1,任意两个站点间传播时延为τ,若能正常检测到冲突,τ的值应该为()。
46803
一个快速Ethernet交换机端口的数据传输速率是100Mbps,若该端口支持全双工数据通信,则该端口实际的传输带宽是()Mbps。
46804
虚拟局域网(VLAN)的技术基础是()。
46805
CSMA/CD的特点是()。
46806
使用Manchester编码的网络是()。
46807
PPP协议在链路中使用异步传输时,采用()方法来实现透明传办理。
46808
以太网数据帧最大长度是()B。
46809
网卡完成()功能。
46810
MAC地址通常存储在计算机的()。
46811
一个数据通信系统可划分为三大部分,即源系统、和目的系统。
46812
先将数字信号转换为模拟信号,再利用高频载波在信道上传输叫()传输。
46813
将发送端的数字信号变换成模拟信号的过程称为(),而将接收端的模拟信号还原成数字信号的过程称为解调。
46814
有一频带为100kHz的信道,假设每路信号的带宽为3.3kHz,保护频带为0.8kHz,若采用频分多路复用,则最多能传输的路数是()。
46815
导引性传输介质有()、同轴电缆和光纤。
46816
根据OSI/RM和TCP/IP,下面的表格(4)部分应该是()。
46817
用于LAN范围的FDDI大多采用单模光纤,而用于WAN范围的FDDI大多采用多模光纤。
46818
信道的带宽或信道中的信噪比越大,信息的极限传输速率就越高。
46819
在有线宽带接入时,ADSL铜质用户线的两端都必须安装ADSLmodem,HFC的cablemodem也需要成对使用。
46820
CDMA即不分频道也不分时隙,是每个用户分配一个地址码,各个码型互不重叠,在同一时间使用相同频带进行通信的技术。
46821
最初在数字传输系统中使用的传输标准是脉冲编码调制PCM。现在高速的数字传输系统中使用的是PCM和SDH。
46822
ADSL是用数字技术对现有模拟电话的用户线进行改造从而使之能承载宽带数字业务,其数据传输中的下行带宽低于下行带宽。
46823
要提高信道上数据传播速率,可使用更好的传输介质,或使用先进的调制技术。
46824
数据传输中的“噪声”指的是()。
46825
假设某信道受奈氏准则限制的最高码元速率为20000码元/秒。如果采用振幅调制,把码元的振幅划分成16个不同的等级来传送,那可以获得的数据率为()kbps。
46826
若信道的带宽为4000Hz,那最高码元传输速率为每秒()个码元。
46827
调制解调技术主要用于()的通信方式中。
46828
HFC利用()接入Internet。
46829
在物理层接口特性中,用于描述完成每种功能的事件发生顺序的是()特性。
46830
光纤上采用的多路复用技术是()。
46831
对等层协议之间交换数据的基本单位是()。
46832
多路复用器的主要功能是()。
46833
按照信号传送的方向与时间的关系,以下不属于正确的数据通信术语的是()。
46834
若码元传输速率为2400波特,每个码元可取4种有效离散值,则相应的数据传输速率为()。
46835
物理层传输的是()。
46836
端系统之间的通信方式有两种:C/S方式和()方式。(填英文缩写,字母大写)
46837
处在互联网边缘的部分的是连接在互联网上的所有的主机。这些主机又称为()。(填中文)
46838
局域网的英文缩写为()。(字母大写)
46839
互联网服务提供者的英文缩写是(),他为用户接入网络提供相关服务。(字母大写)
46840
按网络的使用者将网络进行分类,可分为公用网和()。
46841
协议的三要素为:语法、和同步。
46842
讨论计算机网络的特点时,使上网用户之间都可以交换信息(数据,以及各种音频视频),好像这些用户的计算机都可以彼此直接连通一样,这是计算机网络的()特点。
46843
将发送端的数字信号变换成模拟信号的过程称为(),而将接收端的模拟信号还原成数字信号的过程称为解调。(填中文)
46844
从逻辑功能上,计算机网络可分为通信子网和()子网。
46845
从互联网的工作方式来看,可以将互联网划分成两部分:边缘部分和()部分。
46846
对于协议和服务的关系,我们通常说:协议是“垂直的”,服务是“水平的”。
46847
Internet和internet两者含义完全一样,都是网络的网络。
46848
OSI/RM的最高层是网络层。
46849
所有互联网标准都以RFC的形式在互联网上发表。
46850
端系统的拥有者可以是个人,也可以是单位(如学校、企业、政府机关等),但不会是某个ISP。
46851
任意把几个计算机网络互连起来(不管采用什么协议),并能够相互通信,这样构成的是一个互连网(internet),而不是互联网(Internet)。
46852
网络中的时延由发送时延、传播时延、处理时延和排队时延四部分构成,其中发送时延对整个网络的时延起决定性作用。
46853
TCP/IP是四层体系结构:应用层、运输层、网际层和物理层。
46854
网络层处于运输层和应用层之间。
46855
网络协议中,涉及数据及控制信息的格式、编码及信号电平等的是()。
46856
Internet网络本质上属于()。
46857
在()方式中,要经过建立连接、数据传输和释放连接等过程。
46858
相邻层间交换的数据单元称之为服务数据单元,服务数据单元的英文缩写是()。
46859
广域网覆盖的地理范围从几十千米到几千千米,它的通信子网主要使用()。
46860
下列关于对等网络的说法中,正确的是()。
46861
计算机网络各层次结构模型及其协议的集合称为()。
46862
最早的计算机网络是()。
46863
在一座大楼内的一个计算机网络系统属于()。
46864
The style seemed to inspire people to()(挑战社会准则)because Jazz itself challenges the social norms of music.
46865
To run away from dreary present rural life and to()(彰显个性), they sought comfort in faster and happier jazz music.
46866
Jazz has made huge contribution to the()(妇女解放)in post war American society.
46867
Chinese traditional opera is the()(精华)of Chinese culture, the soul of Chinese civilization.
46868
The issue of euthanasia has been at the center of every heated debates for many years and raises a number of agonizing()(道德困境).
46869
Outlining, mapping and summarization are three techniques for us to practice distinguishing between major and minor supporting details.
46870
In writing a descriptive prose, it is not enough that you know what you mean; the most important thing is that you should transfer your thoughts onto paper in right words so that others could get the message with no misunderstanding.
46871
Performers of Chinese opera were referred to as “disciples of the pear garden”.
46872
Legalization of euthanasia is practically impossible due to inheritance issue.
46873
Greek tragic-comedy and Indian Sanskrit opera have as long a history as Chinese opera.
46874
Many people find it difficult to discern the differences between jazz and blues, the reason of which might probably due to(), both culturally and geographically.
46875
After the civil war, many performers of traditional Chinese opera had to find work, any sort of work to keep daily wheels().
46876
Terminally ill people appeal for euthanasia due to following reasons except for()
46877
Terri Shiavo entered()in 1990 for undetermined reasons, possibly due to her long-term, untreated bulimia.
46878
Although he made a great deal of money, he could never()his feelings of worthlessness.
46879
Although he’s only 16 he has very()ideas about life.
46880
Try to()as many children as possible in the game.
46881
Of all the sorrows she had to(), none was so great as her son’s being born blind.
46882
Kodak’s decision not to()the role of official film for the 1984 Los Angeles Olympics was a major miscalculation.
46883
Human control of fire goes back far enough(over a million years)that evolution could have produced a genetic leaning towards fire as a central()of human life.
46884
Meditation(静思)techniques, in contrast, can teach people to put their shortcomings into a larger, more()perspective.
46885
While schools emphasize its usefulness-online research in class and()polling of students, for example – a big part of the attraction is, undoubtedly, that the iPhone is cool and a hit with students.
46886
The film he directed two decades ago still()large audiences today.
46887
She finally()films after an acclaimed stage career.
46888
“I’m self-employed and need the Internet for my work, but I’m failing to()my work, to take care of my home, to give attention to my children,” she wrote in a message sent to the group.
46889
Mr. Jobs has a reputation as a control freak, and his critics complained that the products and systems he designed were closed and inflexible, in the name of greater()of use.
46890
It is a team packed with experienced and()professionals.
46891
The fight for()and economic equality is intensely pragmatic(讲求实用的)and immediate in its impact.()
46892
Sensory details are those details that could arouse a quick, intense, and usually superficial interest, curiosity, or emotional reaction.
46893
Outlining, mapping and summarization are three suggested techniques to practice distinguishing between major and minor supporting details.
46894
Supporting details are those facts and ideas that prove or explain the main idea of a paragraph or an essay, and all types of supporting details are of same importance to your comprehension of a text.
46895
According to the writer, some people are very successful because()
46896
Which of the following is NOT a reason the writer gives to support his view that becoming the best version of yourself will make you happy?
46897
The writer mentions three movies in paragraph 18 because()
46898
Fill in the blank with lexical chunks learnt from the teaching videos of unit 2Multiple communication tasks performed by physicians require genuine personal engagement and().(情感投入).
46899
Fill in the blank with lexical chunks learnt from the teaching videos of unit 2.The idea of “being a good winner” is considered important in Chinese ethics, that is not rubbing one’s victory in or()(吹嘘)it.
46900
Fill in the blank with lexical chunks learnt from the teaching videos of unit 2.Learning any skill requires practice and feedback. Lectures alone cannot teach a physician how to perform a().(手术治疗)
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