The Internet can be viewed conceptually as having four layers: the network technology substrate, transport services and representation standards, middleware services, and applications.
因特网能被概念性地分为四层：网络技术基体、传送服务和表示标准、中间件服务和应用。
The Internet can be viewed conceptually as having four layers: the network technology substrate, transport services and representation standards, middleware services, and applications.
因特网能被概念性地分为四层：网络技术基体、传送服务和表示标准、中间件服务和应用。
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