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The network layer provides services to the transport layer．It call be based on either virtual circuits or datagrams．In both cases，its main job is（ ）packets from the source to the destination． A．dealing with B．sending C．routing D．receiving

题目

The network layer provides services to the transport layer．It call be based on either virtual circuits or datagrams．In both cases，its main job is（ ）packets from the source to the destination． A．dealing with B．sending C．routing D．receiving

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3.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

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更多“The network layer provides services to the transport layer.It call be based on either vir ”相关问题

  • 第1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：

  • 第2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：

  • 第3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（请作答此空）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.network
    B.session
    C.transmission
    D.application

    答案：D
    解析：
    掌握基本词汇，本题还是比较容易的。参考翻译如下：

  • 第4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5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（请作答此空）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.hosts
    B.routers
    C.gateways
    D.offices

    答案：C
    解析：
    掌握基本词汇，本题还是比较容易的。参考翻译如下：

  • 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。

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