RFC分类检索：
　　 以下根据RFC被公布时的状态把RFC索引划分成几类：
rfc-editor.org/categories/rfc-standard.html">Standards(标准) rfc-editor.org/categories/rfc-draft.html">Draft Standards(草案标准) rfc-editor.org/categories/rfc-proposed.html">Proposed Standards(提案标准)

OTHER RFCS(其他RFC)
rfc-editor.org/categories/rfc-experimental.html">Experimental(实验性的) rfc-editor.org/categories/rfc-informational.html">Informational(知识性的) rfc-editor.org/categories/rfc-historic.html">Historic(历史性的)
rfc-editor.org/categories/rfc-unknown.html">Early RFCs (before IETF standards ack　早期的，在IETF标准化之前)

RFC SUB-SERIES(RFC子集)
rfc-editor.org/categories/rfc-standard.html">Standards (标准，STD) rfc-editor.org/categories/rfc-best.html">Best Current Practice (最优当前实现，BCP)
rfc-editor.org/categories/rfc-fyi.html">For Your Information (FYI)

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rfc-editor.org/">http://www.rfc-editor.org/
rfcs/">http://www.faqs.org/rfcs/