正确答案: ABC

routers systems computers

题目：BGP is an inter-autonomous system routing protocol; it is designed to be used between multiple autonomous ( ) . 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 （ ） 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 ( ) 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 （ ） are partitioned into well-known and optional. The provision for optional attributes allows experimentation that may involve a group of BGP （ ） 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.

解析：B,A,B,C,A

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举一反三的答案和解析：

[单选题]●关于防火墙的功能，下列叙述中错误的是(41)．。(41)

防火墙可以阻止来自网络内部的攻击

[单选题]微指令大体上可分为两类：水平型微指令和垂直型微指令。在下列几项中，不符合水平型微指令特点的是(3)。

并行度较低

解析：解析：水平型微指令的主要特征：微指令的长度比较长、微指令中的微操作具有高度的并行性、微指令编码简单，减少了译码时间，使其执行速度快，更多地体现了控制器的硬件细节。垂直型微指令的主要特征：长度短、功能弱、并行度低、编程容易，但微程序长、效率低。

[单选题]若K在Y市的项目花了3天的时间，在Z市的项目花了?天的时间，则下面哪一项一定错误?

他在Z市恰好考察两个项目。

解析：解析：根据题目条件可知当K在Y市花3天的时间时，他只能在Y市考察一个项目。根据条件分析可知，当他已知在一个项目花3天时间时，肯定要在另一个项目花3天的时间。因为他在X市花了4天的时间，所以另一个他花了3天考察的项目一定在Z市，这样就可推知他在Z市考察了3个项目，从而可进一步推知他在X市考察了两个项目。