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Network Communications Technology

This chapter explores the intricate components of Network Operating Systems (NOS), focusing on MS-DOS and BIOS fundamentals. It covers essential hardware elements such as disk drives, printers, keyboards, and motherboards, along with their initialization and testing through firmware in ROM. The text also delineates high and low-level APIs, including application-level network interactions like Telnet, FTP, and Ping. With insights into transport protocols, network drivers, and the NetBIOS framework, this chapter serves as a comprehensive guide for understanding modern networking technologies and standards.

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Network Communications Technology

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  1. Network Communications Technology Chapter 21Network Operating Systems(NOS)

  2. MS DOS BIOS Hardware ( Disk drive ,printer Keyboard, motherboard) MS DOS and the BIOS • Basic Input/Output System • Firmware in ROM • HW initialize and test • Hardware control routines • Establish a low-level API • Bootstrap • MS DOS • Written for IBM (PC-DOS) • Establishes a higher-levelAPI for application programs Figure 21.1

  3. NetBIOS and NOS Firmware on the NIC Figure 21.2

  4. Internet Application Telnet, FTP and Ping Application level Network Neighborhood RAS WINS DHCP NT File System Drivers Redirectors WinSocket Driver Named Pipe Mail Slot NetBIOS Driver Server TDI Transport Drive Interface (TDI) Transport layer NWLink TCP/IP NetBEUI DLC NDIS Network Interface Drive Specification (NIDS) Network Interface Drivers Network Interface Layer Network Interface Card ( NIC) Windows NT Communication Model Figure 21.3

  5. Application Application RPC Application NetWare Core Protocol Presentation NetBIOS Emulator NetWare Shell RPC Session IPX SPX Transport Network ODI NDIS Link LAN Drivers Physical Ethernet Token Ring FDDI others Netware and OSIReference Model Figure 21.4

  6. NetWare Communication Data Base Services Services File System NetWare Modular Bus File and Print Store and Forward Disk Drivers Services Services Netware Loadable Models Figure 21.5

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