● A glue that holds the whole Internet together is the network layer protocol,(71). Unlike most older network layer protocols, it was designed from the beginning with internetworking in mind. Its job is to provide a -(72) way to transport datagrams from s
题目
● A glue that holds the whole Internet together is the network layer protocol,(71). Unlike most older network layer protocols, it was designed from the beginning with internetworking in mind. Its job is to provide a -(72) way to transport datagrams from source to destination, without regard to whether these machines are on the same network or whether there are other networks in between them.
Communication in the Internet works as follows. The (73)layer takes data streams and breaks them up into datagrams. Each datagram is transmitted through the Internet, possibly being fragmented into smaller units as it goes. When all the pieces finally get to the destination machine, they are reassembled by the
(74) layer into the original datagram. This datagram is then handed to the transport layer, which inserts it into the receiving process' input stream.
An IP datagram consists of a header part and a text part. The header has a (75) part and a variable length optional part.
(71) A. IP (Internet Protocol)
B. IP (Interworking Protocol)
C. TCP (Transport Control Protocol)
D. TCP (Transfer Communication Protocol)
(72) A. best-quality
B. quality-guaranteed
C. connection-oriented
D. best-efforts
(73) A. data link
B. transport
C. network
D. application
(74) A. data link
B. transport
C. network
D. application
(75) A. 40-byte fixed
B. 64-byte fixed
C. 20~64 bytes variable
D. 20-byte fixed
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第1题：
● A （71） is a functional unit that interprets and carries out instructions.
（71）
A. memory
B. processor
C. storage
D. network
正确答案：B
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第2题：
work（ ）,systems that effectively isolate an organization's internal network structure from an （ ） network, such as the INTERNET is becoming increasingly popular. These firewall systems typically act as application-layer（ ）between networks, usually offering controlled TELNET, FTP, and SMTP access. With the emergence of more sophisticated（ ）layer protocols designed to facilitate global information discovery , there exists a need to provide a general （请作答此空）for these protocols to transparently and securely traverse a firewall.A.framework
B.internetwork
C.computer
D.Application答案：A解析：掌握基本词汇，本题还是比较容易的。参考翻译如下：
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第3题：
work（ ）,systems that effectively isolate an organization's internal network structure from an （请作答此空） network, such as the INTERNET is becoming increasingly popular. These firewall systems typically act as application-layer（ ）between networks, usually offering controlled TELNET, FTP, and SMTP access. With the emergence of more sophisticated（ ）layer protocols designed to facilitate global information discovery , there exists a need to provide a general （ ）for these protocols to transparently and securely traverse a firewall.A.exterior
B.Internal
C.center
D.middle答案：A解析：掌握基本词汇，本题还是比较容易的。参考翻译如下：
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第4题：
work（请作答此空）,systems that effectively isolate an organization's internal network structure from an （ ） network, such as the INTERNET is becoming increasingly popular. These firewall systems typically act as application-layer（ ）between networks, usually offering controlled TELNET, FTP, and SMTP access. With the emergence of more sophisticated（ ）layer protocols designed to facilitate global information discovery , there exists a need to provide a general （ ）for these protocols to transparently and securely traverse a firewall.A.safeguards
B.firewalls
C.routers
D.switches答案：B解析：掌握基本词汇，本题还是比较容易的。参考翻译如下：
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第5题：
The Hypertext Transfer Protocol , the Web's (请作答此空) protocol , is at the heart of the Web. HTTP is implemented in two programs : a ( ) program and a server program . The client program and server program executing on different end systems , talk to each other by ( ) HTTP messages . HTTP defines how Web clients request Web pages from servers and how servers transfer web pages to clients . when a user ( ) a web page , the browser sends http request messages for the objects in the page to the server . The server ( ) the requests and responds with http response messages that contain the objects .A.transport-layer
B.application-layer
C.network-layer
D.link-layer答案：B解析：Web的应用层协议是超文本传输协议，是web核心。HTTP在两类程序（客户端程序、服务器端程序）中执行。客户端程序、服务器端程序在不同的终端系统中执行，通过交换HTTP消息来进行交互。HTTP定义了Web客户端如何从服务器端请求Web页面以及服务器端如何传送Web页面到服务器。当用户请求一个web页面，浏览器发送页面对象的http请求给服务器。服务器接收请求并用包含对象的http消息进行响应。 -
第6题：
The Hypertext Transfer Protocol,the Web's（请作答此空）protocol,is at the heart of the Web.HTTP is implemented in two programs:a（ ）program and a server program.The client program and server program executing on different end systems,talk to each other by（ ）HTTP messages.HTTP defines how Web clients request Web pages from servers and how servers transfer web pages to clients.when a user（ ）a web page,the browser sends http request messages for the objects in the page to the server.The server（ ）the requests and responds with http response messages that contain the objects.A.transport-layer
B.application-layer
C.network-layer
D.link-layer答案：B解析：Web的应用层协议是超文本传输协议，是web核心。HTTP在两类程序（客户端程序、服务器端程序）中执行。客户端程序、服务器端程序在不同的终端系统中执行，通过交换HTTP消息来进行交互。HTTP定义了Web客户端如何从服务器端请求Web页面以及服务器端如何传送Web页面到服务器。当用户请求一个web页面，浏览器发送页面对象的http请求给服务器。服务器接收请求并用包含对象的http消息进行响应。