The Border Gateway Protocol (BGP) is an interautonomous system （） protocol. The primary function of a BGP speaking system is to exchange network （） information with other BGP system. This network reachability information includes information on the list of Autonomous System (ASs) that reachability information traverses. BGP-4 provides a new set of mechanisms for Supporting （） interdomain routing. These mechanisms include support for advertising an IP （） and eliminate the concept of network class within BGP. BGP-4 also introduces mechanisms that allow aggregation of routes, including （） of AS paths. These changes provide support for the proposed supernettting scheme.

These mechanisms include support for advertising an IP （） and eliminate the concept of network class within BGP.

A．prefix

B．suffix

C．infix

D．reflex

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请回答：

（1）这是毛 * * 为中国革命什么壮举而作？

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（2）导致红军“远征”的最主要原因是什么？

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（3）“红军不怕远征难”中的“难”包括哪些方面？诗中描述了哪些艰难险阻？

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（4）为什么“三军过后尽开颜”？

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（5）说说你从红军这一壮举中汲取的精神财富？

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