根据下面的文字资料回答 68～72 题For each blank．choose the best answerfrom the four choices and write down on the answer sheet．（ 1 ）is a protocol that a host uses toinform. a router when it joins or leaves an Internet muhicast group．（ 2 ） is an error detection code tha

题目

根据下面的文字资料回答 68～72 题For each blank．choose the best answerfrom the four choices and write down on the answer sheet．

（ 1 ）is a protocol that a host uses toinform. a router when it joins or leaves an Internet muhicast group．

（ 2 ） is an error detection code that most data communication networks use．

（ 3 ）is an interior gateway protocol that uses a distance vector algorithm topropagate routing information．

（ 4 ）is a transfer mode in which all types of information ate organized intofixed form. cells onan asynchronous or non－periodic basis over a range of media．

（ 5 ）is an identifier of a web page．

第68题：文中（ 1 ）处正确的答案是（ ）。

A．SMTP

B．ICMP

C．RARP

D．IGMP

相似考题

1.●For each blank，choose the best answer from the four choices and write down on the answer sheet．(66) is a protocol that a host uses to inform. a router when it joins or leaves an Internet multicast group．(67) is an error detection code that most data communication networks use．(68) is an interior gateway protocol that uses a distance vector algorithm to propagate routing information．(69) is a transfer mode in which all types of information are organized into fixed form. cells on an asynchronous or non-periodic basis over a range of media．(70) is an identifier of a web page．(66) A．SMTPB．ICMPC．RARPD．IGMP(67) A．4B／SBB．CRCC．Manchester CodeD．Huffman Code(68) A．OSPFB．RIPC．RARPD．BGP(69) A．ADSLB．ATMC．Frame. RelayD．DDN(70) A．HTTPB．URLC．HTMLD．TAG

2.根据下面的文字资料回答 71～75 题In the following essay，each blank has fourchoices．Choose the best answer and write down on thean，swer sheet．Microwave communication uses（ 1 ）frequency radio waves that travel instraighdine sthroughthe air．Because the waves cannot（ 2 ）with the curvature of the earth，they can be （ 3 ）onlyover short distance．Thus，microwave is a good（ 4 ）for sending data between bulldingsin a city or on a large college campus．For longer distances，the waves must berelayed by means of“dishes”or（ 5 ）．These can be installed on towers，highbuildings，and mountain tops．第71题：文中（ 1 ）处正确的答案是（ ）。A．highB．10wC．1ongD．short

3.Section BDirections:Beneath each of the following sentences, there are four choices marked［A］,［B］,［C］and［D］. Choose the one that best completes the sentence. Mark your answer on ANSWER SHEET 1 by blackening the corresponding letter in the brackets with a pencil. (10 points)第11题：He is too young to be able to _______ between right and wrong.A discard B discern C disperse D disregard

4.●In the following essay, each blank has four choices.Choose the best answer and write down on the answer sheet.Communicating via Email is by far the most common Internet activity.You can (71) with anyone in the world who has an Internet address or Email (72) with a system connection to the Internet.All you need is (73) the Internet and an Email program.Two of the most widely used Email programs are Microsoft's (74) and Netscape's Navigator.A typical Email message has three basic (75) : header, message, and signature.(71) A．connectB．exchangeC．communicateD．game(72) A．accountB．No.C．userD．administrator(73) A．attach withB．graspC．possessD．access to(74) A．YahooB．ExplorerC．FoxmailD．Outlook Express(75) A．packetsB．elementsC．framesD．cells

参考答案和解析
正确答案：D
IGMP协议是Intemet组管理协议。TCP／IP协议族的一个子协议，允许Intemet主机参加多播，也即是IP主机用作向相邻多目路由器报告多目组成员的协议。多目路由器是支持组播的路由器，向本地网络发送IGMP查询。主机通过发送IGMP报告来应答查询。组播路由器负责将组播包转发到所有网络中组播成员。
循环冗余校验(CRC)是一种用得最广，检错能力很强的差错检测方法。它对数据进行多项式计算，并将得到的和数附在帧的后面。接收设备也执行类似的算法。
RIP是推出时间最长的路由协议，也是最简单的路由协议。它是“路由信息协议”的缩写，主要传递路由信息(路由表)来广播路由：每隔30秒，广播一次路由表，维护相邻路由器的关系，同时根据收到的路由表计算自己的路由表。RIP运行简单，适用于小型网络，Internet上还在部分使用着RIP。
OSPF协议是“开放式最短路优先”的缩写。“开放”是针对当时某些厂家的“私有”路由协议而言，而正是因为协议开放性，才造成OSPF今天强大的生命力和广泛的用途。它通过传递链路状态(连接信息)来得到网络信息，维护一张网络有向拓扑图，利用最小生成树算法
(SPF算法)得到路由表。OSPF是一种相对复杂的路由协议。ATM是Asynchronous Time division multiplexing的缩写，译为“异步传输模式”，它是以高速分组传送模式为主，综合电路传输模式优点的一种宽带传输模式。
URL是单一资源定位符，是一种用来鉴别文件和资源在WWW中地址的专用表示。
更多“根据下面的文字资料回答 68~72 题For each blank.choose the best answerfrom the four choices ”相关问题

  • 第1题：

    根据下面的文字资料回答 71～75 题 In the following essay．each blank has four choices．Choose the best answer and write down on the answer sheet．

    Spread spectrum simply means that data is sent in（ 1 ）pieces over a number of the discrete frequencies available for use at any time in the specified range．Devices using（ 2 ） spread spectrum(DSSS)communicate by splitting each（ 3 ）of data into several parts and sending them concurrently on different（ 4 ），DSSS uses a lot of the available（ 5 ），about 22 megahertz(MHz)．

    第71题：文中（ 1 ）处正确的答案是（ ）。

    A．small

    B．high

    C．low

    D．long


    正确答案：A
    简单地来说，扩频就是在一个可以随时使用的特定频率范围内，把数据用小块在大量不连续的频率上同时发送。使用直序扩频
    图6网卡的简单框架
    的设备相互之间通信是通过把每个字节的数据分成几个部分在不同的频率上同时传送。直序扩频使用了大约22 Mb的有效带宽。

  • 第2题：

    ●In the following essay，each blank has four choices．Choose the most suitable one from the four choices and write down in the answer sheet．

    Open Shortest Path First(OSPF)is a (66) routing algorithm that (67) work done on the OSI IS-IS intradomain routing protocol．This routing，as compared to distance-vector routing，requires (68) processing power．The Dijkstra algorithm is used to calculate (69) OSPF routing table updates only take place when necessary， (70) at regular intervals．

    (66) A．distance-vector

    B．link-state

    C．flow-based

    D．selective flooding

    (67) A．derived from

    B．deviated from

    C．was derived from

    D．was deviated from

    (68) A．more

    B．less

    C．same

    D．most

    (69) A．routes

    B．road

    C．distance

    D．cost

    (70) A．but rather

    B．rather too

    C．rather than

    D．rather that


    正确答案：B,C,A,A,D
     【解析】OSPF(Open Shortest Path First)是一个内部网关协议(Interior Gateway Protocol，IGP)，用于在单一自治系统(Autonomous System，AS)内决策路由。与RIP相对，OSPF是链路状态路由协议，而RIP是距离矢量路由协议。
    链路是路由器接口的另一种说法，因此OSPF也称为接口状态路由协议。OSPF通过路由器之间通告网络接口的状态来建立链路状态数据库，生成最短路径树，每个OSPF路由器使用这些最短路径构造路由表。

  • 第3题：

    There are 15 incomplete sentences in this section. For each sentence there are four choices marked A, B, C and D. Choose one answer that best completes the sentence and blacken the corresponding letter on the Answer sheet.

    6. ----Bradford graduated from college with honors at a very young age.

    ----He _____ have been an outstanding student.

    A must B could C should D might


    正确答案：A

  • 第4题：

    ●In the following essay，each blank has four choices．Choose the best answer and write down on the answer sheet．

    Spread spectrum simply means that data is sent in (66) pieces over a number of the discrete frequencies available for use at any time in the specified range．Devices using (67) spread spectrum(DSSS)communicate by splitting each (68) of data into several parts and sending them concurrently on different (69) ,DSSS uses a lot of the available (70) ，about 22 megahertz(MHz)．

    (66) A．small

    B．high

    C．low

    D．long

    (67) A．direct-sequence

    B．discrete-sequence

    C．duplicate-sequence

    D．dedicate-sequence

    (68) A．data

    B．byte

    C．packet

    D．bit

    (69) A．bits

    B．frequencies

    C．packets

    D．messages

    (70) A．rate

    B．velocity

    C．bandwidth

    D．period


    正确答案：A,B,B,B,C
    【解析】简单地来说，扩频就是在一个可以随时使用的特定频率范围内，把数据用小块在大量不连续的频率上同时发送。使用直序扩频的设备相互之间通信是通过把每个字节的数据分成几个部分在不同的频率上同时传送。直序扩频使用了大约22 Mb的有效带宽。

  • 第5题：

    根据下面的文字资料回答 71～75 题 In the following essay，each blank has four choices．Choose the most suitable one from the four choices and write down in the answer sheet．A（ 1 ）is basically an end point of a communication link between two applications.Sockets that extend over a network connect two or more applications running on separate computer sat tached to the network．Asocket（ 2 ）twoaddresses：（ 3 ）．Sockets providea （ 4 ）communication channel between one or more systems.There are stream and datagram sockets separately using TCP and（ 5 ）．

    第6题：文中（ 1 ）处正确的答案是（ ）。

    A．program

    B．UDP

    C．socket

    D．TCP


    正确答案：C
    Socket是两个应用之间的联系接口。Socket使网络中不同的计算机之间的应用能够联系在一起。一个Socket有两个地址：端口号和IP地址。Socket提供了在多个系统中全双工通信的方式。TCP在Socket传递的是字符流，而UDP传递的是数据报。

  • 第6题：

    根据以下内容，回答 68～72 题：

    A．苯海拉明

    B．组胺

    C．西咪替丁

    D．氮革斯汀

    E．肾上腺素

    第 68 题 过敏性休克应选用（ ）。


    正确答案：E

  • 第7题：

    In the following essay, each blank has four choices. Choose the best answer and write down on the answer sheet.

    Spread spectrum simply means that data is sent in(66)pieces over a number of the discrete frequencies available for use at any time in the specified range. Devices using(67) spread spectrum (DSSS)communicate by splitting each(68)of data into several parts and sending them concurrently on different (69), DSSS uses a lot of the available(70), about 22 megahertz (MHz).

    A．small

    B．high

    C．low

    D．long


    正确答案：A

  • 第8题：

    In the following essay, each blank has four choices. Choose the best answer and write-down on the answer sheet.

    Microwave communication uses high-frequency(71)waves that travel in straightlines through the air. Because the waves cannot(72)with the curvature of the earth, they can be(73)only over short distance. Thus, microwave is a good(74)for sending data between buildings in a city or on a large college campus. For longer distances, the waves must be relayed by means of "dishes" or(75). These can be installed on towers, highbuildings, and mountain tops.

    A．optical

    B．radio

    C．electrical

    D．magnetic


    正确答案：B

  • 第9题：

    请教:2009年11月北京地区成人英语三级考试(A)卷第2大题第1小题如何解答?

    【题目描述】

    Directions: In this part there are 30 incomplete sentences. For each sentence there are four choices marked A, B, C and D. Choose the ONE answer that best completes the sentence. Then blacken the corresponding letter on the Answer Sheet.

    16. The driver was at ____ loss when ____ word came that he was forbidden to drive for speeding.

    A a;/

    B a;the

    C the;the

    D /;/

     


    正确答案：A

  • 第10题：

    Section A

    Directions: Beneath each of the following sentences there are four choices marked A, B. C and D. Choose the one answer that best completes the sentence.

    25. Four Chinese models were ______ the 14 people awarded prizes on Friday at the World Supermodel Competition.

    A. among

    B. between

    C. along

    D. beside


    正确答案：A

  • 第11题：

    Ⅲ. There are four choices following each statement. Mark the choice that can best complete the statement: If a linguistic study describes and analyzes the language people actually use, it is said to be （）

    • A、prescriptive
    • B、analytic
    • C、descriptive
    • D、linguistic

    正确答案:C

  • 第12题：

    多选题
    Consider each of the choices separately and select all that apply.　 If a father of four children carries the Huntington’s mutation, which of these is true?
    A

    Two of the four children may inherit the mutation.

    B

    Two of the four children may have the disease.

    C

    Two of the four children may end up disease free.


    正确答案： A,C
    解析：
    根据“If one parent carries the mutation, each offspring has a 50-50 chance of inheriting the mutated gene”可知，本题选A、B、C三项。

  • 第13题：

    Directions: There are 15 incomplete sentences in this section. For each sentence there are four choices marked A, B, C and D. Choose one answer that best completes the sentence and blacken the corresponding letter on the answer sheet.

    6. ______ the look on his face, he wasn't satisfied with their performance.

    A. To judge by

    B. Judging by

    C. Judge by

    D. To be judged by


    正确答案：B

  • 第14题：

    Directions: Beneath each of the following sentences there are four choices markedA,

    B, C and D. Choose the one answer that best completes the sentence.

    Example:

    The wild flowers looked like a soft orange blanket the desert.

    A. covering B. covered C. cover D. to cover

    The answer is A.

    21. Listen! Do you hear someone for help?

    A. calling

    B. call

    C. to call

    D. called


    正确答案：A

  • 第15题：

    根据下列选项，回答 68～72 题：

    A．五味子

    B．决明子

    C．补骨脂

    D．吴茱萸

    E．栀子第 68 题

    第 68 题 含生物碱的药材为（ ）


    正确答案：D

  • 第16题：

    根据下列选项，回答 68～72 题：

    A．蓝色

    B．碧蓝色

    C．亮蓝灰色

    D．黄色

    E．亮淡绿色

    第 68 题 板蓝根水浸液紫外灯下显（ ）


    正确答案：A

  • 第17题：

    ●For each blank, choose the best answer from the four choices and write down on the answer sheet.

    (71) is a channel's capacity which directly reflects the data transfer rate of the channel.

    (72) functions in a NetWare network which is used to define addressing schemes.

    (73) is a network layer device that supports multiple LAN interfaces and segments LANs into smaller collision and broadcast domains.

    (74) is the popular LAN developed under the direction of the IEEE802.3.

    (75) is a device which enables digital microcomputers to communicate across analog telephone lines.

    (71) A．The volume

    B．The bandwidth

    C．The noise

    D．The delay

    (72) A．NetBEUI

    B．IP

    C．IPX

    D．NCP

    (73) A．The repeater

    B．The hub

    C．The bridge

    D．The router

    (74) A．Token Ring

    B．Token Bus

    C．Ethernet

    D．FDDI

    (75) A．The repeater

    B．The modem

    C．The hub

    D．The printer


    正确答案：B,C,D,C,B
    【解析】带宽是指信道的容量，能够直接反映出信道数据传输速率。作用在Netware网络中，用以定义寻址方法。路由器是网络层设备，它支持多局域网接口并能够把局域网分为更小冲突域和广播域。以太网是流行的网络，它是在IEEE802.3标准的基础上发展起来的。调制解调器是一种能使得数字信号通过模拟线路进行通信的设备。

  • 第18题：

    根据下列选项回答 68～72 题。

    A．大剂量突击疗法

    B．一般剂量长期疗法

    C．小剂量替代疗法

    D．隔日疗法

    E．局部外用

    第 68 题 湿疹使用（ ）。


    正确答案：E

  • 第19题：

    In the following essay, each blank has four choices. Choose the most suitable one from the four choices and write down in the answer sheet.

    The key to SNMP(66)is its simplicity. It has a small command set that does a good job of collecting information from(67)any network device. In a SNMP environment,(68)of the work is handled by the network management system. Devices that are being managed are not(69)with processing(70)that might affect their performance.

    A．popularity

    B．function

    C．efficiency

    D．power


    正确答案：A

  • 第20题：

    For each blank, choose the best answer from the four choices and write down on the answer'sheet.

    (66)is a protocol that a host uses to inform. a router when it joins or leaves an Internet multicast group.

    (67)is an error detection code that most data communication networks use.

    (68)is an interior gateway protocol that uses a distance vector algorithm to propagate routing information.

    (69)is a transfer mode in which all types of information are organized into fixed form. cells on an asynchronous or non-periodic basis over a range of media.

    (70)is an identifier of a web page.

    A．ICMP

    B．SMTP

    C．IGMP

    D．ARP


    正确答案：C
    解析：IGMP协议是接收者发现协议。IGMP协议运行在主机和路由器之间，用于路由器维护组播组是否有组成员。IGMP只维护组播组是否有成员，而不维护组播组有哪些成员，因此状态信息不会因组播组成员的增加而增加。
      循环冗余校验(cyclic redundancy check，CRC)是由分组线性码的分解而来，其主要应用是二元码组，主要应用于数据传输过程中的差错控制。
      OSPF是一个内部网关协议(Interior Gateway Protocol，IGP)，用于在单一自治系统 (autonomous system，AS)内决策路由。与RIP相对，OSPF是链路状态路由协议，而RIP是距离向量路由协议。它是依靠距离，即跳数来衡量一条路径的好坏。通过距离向量路由算法来传播路由信息。
      ATM是异步传输模式，实现OSI物理层和链路层功能。ATM以独有的ATM信元进行数据传输，每个ATM信元为53个字节。ATM不严格要求信元交替地从不同的源到来，每一列从各个源来的信元，没有特别的模式，信元可以从任意不同的源到来，而且不要求从一台计算机来的信元流是连续的，数据信元可以有间隔，这些间隔由特殊的空闲信元(idle cell)填充。
      URL(Uniform. Resource Locator)是单一资源定位符，是一种用来鉴别文件与资源在WWW中地址的专用表示。

  • 第21题：

    Directions: There are 15 sentences in this section. For each sentence there are four choices marked A, B, C and D. Choose one answer that best completes the sentence and blacken the corresponding letter on the answer sheet.

    6. ______ you go there early, there won't be much a chance of getting a ticket.

    A. Until

    B. If

    C. Unless

    D. If only


    正确答案：C

    答案为C。不会有很多机会得到票，除非你早点到那儿。unless“除非”；until“直到” if“如果”；if ioly如果......该多好”。只有C选项能用在句中。

  • 第22题：

    A small business currently has four separate servers， three of which perform low-overhead tasks with small memory footprints. How could the company BEST reduce power consumption among these four servers， while not sacrificing functionality？（）

    • A、Enable each server’s Cool ’n’ Quiet and/or SpeedStep functionality so that processing power is conserved.
    • B、Enforce auto-shutdown routines on all four servers for after-hours power saving while the office is closed.
    • C、Consolidate the four servers onto the best two，combining them logically by tasks and memory consumption.
    • D、Consolidate the four servers onto the most powerful machine using virtualization.

    正确答案:D

  • 第23题：

    单选题
    Directions: For each question in this section, select the best answer from among the choices given.　　The following sentences test correctness and effectiveness of expression. Part of each sentence or the entire sentence is underlined; beneath each sentence are five ways of phrasing the underlined material. Choice A repeats the original phrasing; the other four choices are different. If you think the original phrasing produces a better sentence than any of the alternatives, select choice A; if not, select one of the other choices.　　In making your selection, follow the requirements of standard written English; that is, pay attention to grammar, choice of words, sentence construction, and punctuation. Your selection should result in the most effective sentence—clear and precise, without awkwardness or ambiguity.　　It being difficult to monitor the eating habits of adults, so doctors must trust their patients to follow dietary recommendations.
    A

    It being

    B

    Because it is

    C

    It is

    D

    Being that it is

    E

    Although it is


    正确答案： E
    解析：
    “it being和being”这样的短语不是标准短语，经常在非正式场合时被用来指原因。第二个从句之前已经有连词so，因此在句子开始没有必要用because或since。因此最好的选项为C。

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