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Introducing Network Standards

Introducing Network Standards. Open Systems Interconnection (OSI) Model IEEE 802.x Standard Device Drivers and OSI. 1. Open Systems Interconnection (OSI) Model. Network Communications OSI Model Windows NT and the OSI Model. 2. Network Communications. Sending Computer Must:

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Introducing Network Standards

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  1. Introducing Network Standards • Open Systems Interconnection (OSI) Model • IEEE 802.x Standard • Device Drivers and OSI 1

  2. Open Systems Interconnection (OSI) Model • Network Communications • OSI Model • Windows NT and the OSI Model 2

  3. Network Communications Sending Computer Must: • Recognize data • Divide it into manageable chunks • Add information to determine its location and identify the receiver • Add timing and error-checking information • Put data on the network and send it 3

  4. Seven-Layer OSI Model 4

  5. OSI Layer Relationships 5

  6. Application Layer (7) • Topmost layer • Represents services that directly support user applications • Window to network services • Handles network access, flow control, and error recovery 6

  7. Presentation Layer (6) • Network translator • On sending end, determines formatting used to exchange data among computers and adds formatting so data can be understood by network • On receiving end, translates data from application format to a common intermediate format • Manages data compression, translation, encryption • I/O redirectors work to redirect resources to a server 7

  8. Session Layer (5) • Allows two applications on different computers to open, use, and close connections • Performs name recognition and provides security • Provides synchronization by placing checkpoints in the data stream • Implements dialog control between communication processes 8

  9. Transport Layer (4) • Sending end: repackages message, divides long messages to ship properly over determined route and arrive error-free • Receiving end: unpacks message, reassembles it, and acknowledges receipt • Provides flow control, error handling, and solves transmission problems 9

  10. Network Layer (3) • Addresses the package using network address scheme • Determines the best route on the network based on network conditions, priority of service • Performs packet switching, routing, traffic management, and controls congestion of data 10

  11. Data-Link Layer (2) • Sending end: sends data frames from network layer to physical layer • Receiving end: packages raw bits from physical layer into data frames • Parts of data frame: Destination ID, Sender ID, Control Data • Acknowledges data frames, error checking, and verification 11

  12. Simple Data Frame 12

  13. Physical Layer (1) • Bottommost Layer • Hardware-oriented, establishes and maintains physical link between communication computers • Defines how the cable is attached to the NIC • Packet sent as an unstructured raw bit stream over physical medium • Referred to as the “hardware layer” 13

  14. OSI Model Layer Mnemonics OSI Layer Down Up 14

  15. Packet Assembly and Disassembly Process 15

  16. Windows NT and OSI 16

  17. Software and Protocols 17

  18. Windows NT Architecture with Boundary Interfaces 18

  19. The IEEE 802.x Standard • The 802 Project Model 19

  20. 802 Specifications Set Standards for: • Network Interface Cards (NICs) • Wide area network (WAN) components • Components used to create twisted-pair and coaxial cable networks 20

  21. 802 Specification Categories 802.1 Internetworking 802.2 Logical Link Control (LLC) 802.3 MAC layer, Carrier Sense Multiple Access with Collision Detection (CSMA/CD) LAN (Ethernet) 802.4 MAC layer, Token Bus LAN 802.5 MAC layer, Token Ring LAN 802.6 Metropolitan area Network (MAN) 802.7 Broadband Technical Advisory Group 802.8 Fiber-Optic Technical Advisory Group 802.9 Integrated Voice/Data Networks 802.10 Network Security 802.11 Wireless Network 802.12 Demand Priority Access LAN, 100BaseVG-AnyLAN 802.13 Unused 802.14 Cable modem standards 802.15 Wireless personal area networks (WPAN) 802.16 Broadband wireless standards 21

  22. Project 802 LLC and MAC Sublayers 22

  23. Project 802 LLC and MAC Standards 23

  24. Device Drivers and OSI • Role of Drivers • Network Environment • Network Driver Interface Specifications (NDIS) • Open Data-Link Interface (ODI) • Bridging NDIS and ODI 24

  25. Role of Drivers Drivers for nearly every type of device including: • Input devices, such as mouse and keyboard devices • SCSI and IDE disk controllers • Hard and floppy-disk drives • Multimedia devices such as microphones, cameras, and recorders • Network Interface Cards (NICs) • Printers, plotters, tape drives, and so forth 25

  26. Communication Between the NIC and Network Software 26

  27. Network Driver Interface Specification (NDIS) Three types of network software: • Protocol Stack: Provides network communications; generates and disassembles frames that are sent to and received from network • Adapter Driver: Controls network interface hardware; works in MAC sublayer and moves frames between protocol stack and interface hardware • Protocol Manager: Controls activity between protocol stack and MAC 27

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