41●在Windows 系统中，___(63）不是网络服务组件。
A.RAS
B.HTTP
C.IIS
D.DNS
开始考试练习点击查看答案42●在OSI 参考模型中，数据链路层处理的数据单位是___(64）。
A.比特
B.帧
C.分组
D.报文
开始考试练习点击查看答案43●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
开始考试练习点击查看答案44● 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
开始考试练习点击查看答案45● 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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