●在OSI 参考模型中，数据链路层处理的数据单位是___(64）。

试卷相关题目

• 1●在Windows 系统中，___(63）不是网络服务组件。

  A.RAS

  B.HTTP

  C.IIS

  D.DNS

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• 2●下列（62）设备可以隔离ARP广播帧。

  A.路由器　　　　

  B.网桥　　　　　　

  C.以太网交换机　

  D.集线器

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• 3●通过代理服务器使内部局域网中的客户机访问Internet 时，___(61）不属于代理服务器的功能。

  A.共享IP地址

  B.信息缓存

  C.信息转发

  D.信息加密

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• 4●为保证用户在网络上边下载边观看视频信息，需要采用____(60）__技术。

  A.流媒体

  B.数据库

  C.数据采集

  D.超链接

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• 5●要在网络上发布彩色动画文件，可以采用的存储格式是___(59)___ 。

  A.BMP

  B.JPEG

  C.MP3

  D.GIF

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• 6●在OGSA 标准中定义了___(65）的概念，它提供一组遵守特定的约定并定义明确的接口，是实体之间产生、管理和交换信息的机制。

  A.Object

  B.Grid Service

  C.Web Service

  D.XML

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• 7● MIDI enables people to use ___(66）computers and electronic musical instruments. There are actually three components to MIDI, the communications "___(67）", the Hardware Interface and a distribution ___(68）called "Standard MIDI Files". In the context of the WWW, the most interesting component is the ___(69）Format. In principle, MIDI files contain sequences of MIDI Protocol messages. However, when MIDI Protocol ___(70）are stored in MIDI files, the events are also time-stamped for playback in the proper sequence. Music delivered by MIDI files is the most common use of MIDI today.

  A.personal

  B.electronic

  C.multimedia

  D.network

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• 8● Certificates are ___(71） documents attesting to the ___(72） of a public key to an individual or other entity. They allow verification of the claim that a given public key does in fact belong to a given individual. Certificates help prevent someone from using a phony key to ___(73）someone else. In their simplest form, Certificates contain a public key and a name. As commonly used, a certificate also contains an ___(74）date, the name of the CA that issued the certificate, a serial number, and perhaps other information. Most importantly, it contains the digital ___(75） of the certificate issuer. The most widely accepted format for certificates is X.509 , thus, Certificates can be read or written by any application complying with X.509.

  A.text

  B.data

  C.digital

  D.structured

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