宽带ISDN的业务分为两类：交互型业务和______业务。

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答案

参考答案：发布型

解析：

[分析]：交互型业务是指在用户间或用户与主机之间提供双向信息交换的业务，发布型业务是由网络中的某点向其他多个位置传送单向信息流的业务。

单项选择题

对（）而言，无差异曲线表现为一条向右凸的曲线。

A．风险爱好者

B．风险厌恶者

C．风险中性者

D．所有投资者

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单项选择题

BGP is an inter-autonomous system routing protocol; it is designed to be used between multiple autonomous ___40___. BGP assumes that routing within an autonomous system is done by an intra-autonomous system routing protocol. BGP does not make any assumptions about intra-autonomous system ___41___ protocols employed by the various autonomous systems. Specifically, BGP does not require all autonomous systems to run the same intra-autonomous system routing protocol.

BGP is a real inter-autonomous system routing protocol. It imposes no constraints on the underlying Internet topology. The information exchanged via BGP is sufficient to construct a graph of autonomous systems connectivity from which routing loops may be pruned and some routing. ___42___ decisions at the autonomous system level may be enforced.

The key feature of the protocol is the notion of Path Attributes. This feature provides BGP with flexibility and expandability. Path ___43___ are partitioned into well-known and optional. The provision for optional attributes allows experimentation that may involve a group of BGP ___44___without affecting the rest of the Internet. New optional attributes can be added to the protocol in much the same fashion as new options are added to the Telnet protocol, for instance.

43（）

A.states

B.searches

C.attributes

D.researches

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