2. 计算机
  3. BGP is an inter-autonomous system routing protocol；it is designed to be used between multiple autonomous (1) ．BGP assumes that

BGP is an inter-autonomous system routing protocol；it is designed to be used between multiple autonomous (1) ．BGP assumes that

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问题 BGP is an inter-autonomous system routing protocol；it is designed to be used between multiple autonomous  (1)  ．BGP assumes that routing within an autonomous system is done by an intra-autonomous system muting protocol．BGP does not make any assumptions about intra-autonomous system  (2)  protocols employed by the various autonomous systems． Specifically，BGP does not require all autonomous systems to run the salne 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   (3)  decisions at the autonomous system level may be enforced．
    The key feature ofthe protocol is the notion of Path Attributes．This feature provides BGP withflexibilityandexpandability．Path  (4)  arepartitionedintowell-knownandoptional．The provision for optional attributes allows experimentation that may involve a group ofBGP  (5)  without affecting the rest ofthe Internet．New optional attributes Can be added to the protocol in muchthe same fashion as new options are added to the Telnet protocol，for instance．
(5)
选项 A、routers
B、states
C、meters
D、costs
答案A
解析 BGP是自治系统间的路由协议，它被应用于多个自治系统之间。．BGP假定，自治系统内部的路由已经由自治系统内部的路由协议搞定。BGP对于各个自治系统采用的自治系统内部路由协议没有任何假定的条件。特别，也不要求所有的自治系统都运行同样的自治系统内部路由协议。
    BGP是一个实用的自治系统间的路由协议。它对底层的Internet技术没有任何限制。通过BGP交换的路由信息足以构造一个自治系统连接图，据此对路由环路进行修剪，并在自治系统这一级实施路由策略决策。
    这个协议关键的特点是通路属性的表示。这个特点为BGP提供了灵活性和可扩展性。通路属性被划分为众所周知的和任选的两类。提供的任选属性可以在一组BGP路由器中进行实验而不影响因特网的其余部分。新的任选属性可以被加入到协议中，这种方式就像是新的选项被加入到Telnet协议中一样。
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