1122和1123[Braden 1989a, 1989b]。RFC 1122针对链路层、网络层和运输层；RFC 1123针对应用层。这两个RFC对早期重要的RFC文档作了大量的纠正和解释。如果要查看有关协议更详细的细节内容，它们通常是一个入口点。它们列出了协议中关于“必须”、“应该”、“可以”、“不应该”或者“不能”等特性及其实现细节。-1122 and 1123 [Braden 1989a, 1989b]. RFC 1122 for the link layer, network layer and transport layer　RFC 1123 for the application layer. The two pairs of significant early RFC documents RFC made a lot of correcting and explanation. If you want to view more details about the details of the agreement, which is usually an entry point. They are listed in the agreement on the " must,"　" should,"　" may,"　" should"　or " can not"　and other characteristics and implementation details.