Windows NT Networking
Microsoft describes the Windows NT networking architecture as shown in Figure 5.2. Note the importance of NDIS in the Windows NT networking structure. (See Chapter 2 for a description of NDIS.) The NDIS interface, NDIS wrapper, and NDIS-compatible drivers enable the TCP/IP, NWLink, NetBEUI, AppleTalk, and DLC protocols to interact simultaneously with the lower layers. (You learn more about these protocols later in this chapter.)
The Transport Driver Interface (TDI)is an interface that enables the server, redirector, and file system drivers to remain independent of the transport protocol.
NWLink is Microsoft’s version of IPX/SPX.
Windows NT (like other Microsoft operating systems such as Windows for Workgroups and Windows 95) services client requests by using the Server Message Block (SMB) protocol. SMB is an Application layer protocol.
Three stages must take place before a protocol is operational:
1.
A model describes the general function of the protocol.
2.
The protocol is defined in complete detail.
3.
The protocol must be realized by software and hardware designers in real products.
Consider the process of designing a building. The architect first produces sketches that describe the general nature of the building. Then the architect, possibly working with a specialist in particular building trades, develops blueprints that describe every detail of the building. Finally, an actual building is constructed.
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