For each blank，choose the best answer from the four choices and write down on the answer sheet. （ ）is a six bytes OSI layer 2 address which is burned into every networking device that provides its unique identity for point to point communication. （ ）is a
题目
（ ）is a six bytes OSI layer 2 address which is burned into every networking device that provides its unique identity for point to point communication.
（ ）is a professional organization of individuals in multiple professions which focuses on effort on lower-layer protocols.
（ ）functions with two layers of protocols.It Can connect networks of different speeds and can be adapted to an environment as it expands.
（ ）is the popular LAN developed under the direction of the IEEE 802.5.
（请作答此空）is the popular backbone technology for transmitting information at high speed with a high level of fault tolerance which is developed under the direction of ANSI.
B.ATM
C.FDDI
D.SMDS
相似考题
更多“For each blank，choose the best answer from the four choices and write down on the answer sheet. ”相关问题
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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。
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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
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第4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：CSocket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5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
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第6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
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第7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8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。
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第9题：
PART Ⅰ: INCOMPLETE SENTENCES
Directions: This part of the test has incomplete sentences. Four words or phrases, marked (A), (B), (C), (D), are given beneath each sentence. You are to choose the one word or phrase that best completes the sentence. Then, on your answer sheet, find the number of the question and mark your answer.
1. It is on October 1,2009 that the People's Republic of China ______ its 60th birthday.A. congratulated
B. kept
C. remained
D. celebrated答案：D解析：这句话的意思是：2009年10月1日，中华人民共和国(人民)庆祝祖国建立60周年。congratulate表示"向某人祝 贺"；keep表示"保持，遵守"；remain表示"逗留，继续存在"；celebrate表示"庆祝，庆贺，赞美，歌颂"。故D项符合题意。 -
第10题：
PART Ⅰ: INCOMPLETE SENTENCES
Directions: This part of the test has incomplete sentences. Four words or phrases, marked (A), (B), (C), (D), are given beneath each sentence. You are to choose the one word or phrase that best completes the sentence. Then, on your answer sheet, find the number of the question and mark your answer.
Actress Lisa Ross--Ellis filed a lawsuit against The Entertainment Files magazine over false ______ made in their November issue.A. accuse
B. accusative
C. accusations
D. accusatory答案：C解析：accuse是动词，表示"谴责，控告"；accusative表示"宾格(的)"；accusation是名词，表示"指控，罪 名"；accusatory是形容词，表示"责难的，指责的，控诉的"。根据上下文，这里应该填入一个名词，作为定语从句的先行词。故本题正确答案为C。 -
第11题：
For each blank，choose the best answer from the four choices and write down on the answer sheet.
（ ）is a six bytes OSI layer 2 address which is burned into every networking device that provides its unique identity for point to point communication.
（请作答此空）is a professional organization of individuals in multiple professions which focuses on effort on lower-layer protocols.
（ ）functions with two layers of protocols.It Can connect networks of different speeds and can be adapted to an environment as it expands.
（ ）is the popular LAN developed under the direction of the IEEE 802.5.
（ ）is the popular backbone technology for transmitting information at high speed with a high level of fault tolerance which is developed under the direction of ANSI.A.ISO
B.ANSI
C.CCITT
D.IEEE答案：D解析：MAC地址就是在媒体接入层上使用的地址，通俗点说就是网卡的物理地址，现在的MAC地址一般都采用6字节48bit。
IEEE是由多个研究底层协议的机构组成的权威组织。
以太网是共享介质的，物理层接收帧，如果地址和自己的地址一致（或者是广播消息），就留下；反之则转发。因此当主机的数量增加时，网络就会变得十分嘈杂，传送效率明显降低。而网桥是工作在数据链路层的设备，它将一个大型的以太网分为几个小网段，可以取得减少通信量的作用。
令牌环网是一种符合IEEE802.5标准的局域网。监督帧，即令牌，顺序地从一个网站传递到相临的网站上。希望获得网络访问权的网站必须等到令牌到达之后才能传输数据。
光纤分布数据接口是目前成熟的LAN技术中传输速率最高的一种。这种传输速率高达100Mb/s的网络技术所依据的标准是ANSIX3T9.5。该网络具有定时令牌协议的特性，支持多种拓扑结构，传输媒体为光纤。使用光纤作为传输媒体具有多种优点：
较长的传输距离，相邻站间的最大长度可达2km，最大站间距离为200km。
具有较大的带宽，FDDI的设计带宽为100Mbit/s。
具有对电磁和射频干扰抑制能力，在传输过程中不受电磁和射频噪声的影响，也不影响其他设备。
光纤可防止传输过程中被分接偷听，也杜绝了辐射波的窃听，因而是最安全的传输媒体。 -
第12题：
For each blank，choose the best answer from the four choices and write down on the answer sheet.
（ ）is a six bytes OSI layer 2 address which is burned into every networking device that provides its unique identity for point to point communication.
（ ）is a professional organization of individuals in multiple professions which focuses on effort on lower-layer protocols.
（请作答此空）functions with two layers of protocols.It Can connect networks of different speeds and can be adapted to an environment as it expands.
（ ）is the popular LAN developed under the direction of the IEEE 802.5.
（ ）is the popular backbone technology for transmitting information at high speed with a high level of fault tolerance which is developed under the direction of ANSI.A.The hub
B.The bridge
C.The router
D.The proxy答案：B解析：MAC地址就是在媒体接入层上使用的地址，通俗点说就是网卡的物理地址，现在的MAC地址一般都采用6字节48bit。
IEEE是由多个研究底层协议的机构组成的权威组织。
以太网是共享介质的，物理层接收帧，如果地址和自己的地址一致（或者是广播消息），就留下；反之则转发。因此当主机的数量增加时，网络就会变得十分嘈杂，传送效率明显降低。而网桥是工作在数据链路层的设备，它将一个大型的以太网分为几个小网段，可以取得减少通信量的作用。
令牌环网是一种符合IEEE802.5标准的局域网。监督帧，即令牌，顺序地从一个网站传递到相临的网站上。希望获得网络访问权的网站必须等到令牌到达之后才能传输数据。
光纤分布数据接口是目前成熟的LAN技术中传输速率最高的一种。这种传输速率高达100Mb/s的网络技术所依据的标准是ANSIX3T9.5。该网络具有定时令牌协议的特性，支持多种拓扑结构，传输媒体为光纤。使用光纤作为传输媒体具有多种优点：
较长的传输距离，相邻站间的最大长度可达2km，最大站间距离为200km。
具有较大的带宽，FDDI的设计带宽为100Mbit/s。
具有对电磁和射频干扰抑制能力，在传输过程中不受电磁和射频噪声的影响，也不影响其他设备。
光纤可防止传输过程中被分接偷听，也杜绝了辐射波的窃听，因而是最安全的传输媒体。 -
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
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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
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第15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。
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第16题：
Ⅱ. Vocabulary and Structure (15 points)
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. I know the difference between these two words. So ______ they.
A. know
B. will
C. do
D. does
正确答案：C6．答案为C 我知道这两个词的区别，他们也知道。so表示“也...”，句型为so+助动词+主语，根据前一句的谓语动词，得知应选C。
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第17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
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第18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19题：
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
正确答案：DIGMP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。 -
第20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
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第21题：
PART Ⅰ: INCOMPLETE SENTENCES
Directions: This part of the test has incomplete sentences. Four words or phrases, marked (A), (B), (C), (D), are given beneath each sentence. You are to choose the one word or phrase that best completes the sentence. Then, on your answer sheet, find the number of the question and mark your answer.
Mr. Voorhies planned to send the dresser and bed that ______ purchased in Bali to the Netherlands.A. he
B. his
C. him
D. himself答案：A解析：that引导的是一个定语从句，从句缺少主语，应该填入人称代词的主格形式。故本题正确答案为A。 -
第22题：
Directions:Write an essay based on the following chart.In your writing,you should interpret the chart,and You should write about 150 words on the ANSWER SHEET.
答案：解析：The bar chart shows the general trend of university students whotake parttime jobs at different stages during their college life.Seeing from the chart,more than half of the college students,about 66.77%take a parttime job at their first year.And the proportion increases slightly year by year,til the last year,the proportion reaches the maximal number,surging to 88.24%.There are basically three reasons behind this trend.To begin with,most students are eager to take a parttime job in the purpose of earning some money,which can ease their parents'burden.Besides,they can acquire more experience before officially entering the society.And with more experience,they can easily get a job compared to those who do not have any experience.Finally,they can not only turn what they have learnt into the application,but also learn more which they cannot obtain from their books.In my view,getting a parttime job is a good practice.However,the major task of students is still the study.They should make a balance between their academic life and their working life. -
第23题：
For each blank，choose the best answer from the four choices and write down on the answer sheet.
（请作答此空）is a six bytes OSI layer 2 address which is burned into every networking device that provides its unique identity for point to point communication.
（72）is a professional organization of individuals in multiple professions which focuses on effort on lower-layer protocols.
（73）functions with two layers of protocols.It Can connect networks of different speeds and can be adapted to an environment as it expands.
（74）is the popular LAN developed under the direction of the IEEE 802.5.
（74）is the popular backbone technology for transmitting information at high speed with a high level of fault tolerance which is developed under the direction of ANSI.A.The MAC address
B.The IP address
C.The subnet address
D.The virtual address答案：A解析：MAC地址就是在媒体接入层上使用的地址，通俗点说就是网卡的物理地址，现在的MAC地址一般都采用6字节48bit。
IEEE是由多个研究底层协议的机构组成的权威组织。
以太网是共享介质的，物理层接收帧，如果地址和自己的地址一致（或者是广播消息），就留下；反之则转发。因此当主机的数量增加时，网络就会变得十分嘈杂，传送效率明显降低。而网桥是工作在数据链路层的设备，它将一个大型的以太网分为几个小网段，可以取得减少通信量的作用。
令牌环网是一种符合IEEE802.5标准的局域网。监督帧，即令牌，顺序地从一个网站传递到相临的网站上。希望获得网络访问权的网站必须等到令牌到达之后才能传输数据。
光纤分布数据接口是目前成熟的LAN技术中传输速率最高的一种。这种传输速率高达100Mb/s的网络技术所依据的标准是ANSIX3T9.5。该网络具有定时令牌协议的特性，支持多种拓扑结构，传输媒体为光纤。使用光纤作为传输媒体具有多种优点：
较长的传输距离，相邻站间的最大长度可达2km，最大站间距离为200km。
具有较大的带宽，FDDI的设计带宽为100Mbit/s。
具有对电磁和射频干扰抑制能力，在传输过程中不受电磁和射频噪声的影响，也不影响其他设备。
光纤可防止传输过程中被分接偷听，也杜绝了辐射波的窃听，因而是最安全的传输媒体。 -
第24题：
问答题Imagine that you are going to Wenchuan as a volunteer to help victims of the May 12 earthquake and are only allowed to take three things with you. Write a composition about what you would choose and why. You should write no fewer than 120words. Please write your composition on the answer sheet.正确答案：
Three Presents for Children in WenchuanIf I am going to Wenchuan as a volunteer to help victims of the May 12 earthquake, I would like to devote myself to the care of children in Wenchuan. And if I am only allowed to take three things with me, I will bring an interesting story book, an MP3 filled with wonderful music and a diary along with me.
I will tell interesting stories to those children with the help of the story book in order to encourage them to be strong. And I will play some wonderful music through the MP3 for those children. The music will help them to calm down and relieve their pains to some extent. The last one is a diary. I will keep a diary about how those children are becoming stronger and stronger physically and spiritually after the May 12 earthquake. If it is possible, I would have my diary published in order to inspire courage and confidence when overcoming difficulties in our life for all human beings in the world.
I really hope that my three presents would help children in Wenchuan greatly.解析： 暂无解析