RAS and the OSI Model

RAS operates in the upper layers of the International Organization for Standardization Open Systems Interconnection (ISO/OSI) model for network communication. In Windows CE, RAS supports only IP-based protocols. The following illustration shows RAS in relation to other Windows CE communication protocols within the context of the ISO/OSI model.

When creating an application requiring a connection to a remote access server, use Windows CE RAS functions to manipulate the transport layer of the selected Windows CE–based device.