The OSI Model<br />Open Systems Interconnect <br />
The 7 Layers of OSI<br />PURPOSE<br /><ul><li>Interfaces with Applications
Data translation & prep for network
Estab. & Maintain Comm  link
Breaks down mssg to send
Adds logical address info
Adds Physical Addressing
Converts to Signal and sends</li></ul>PROTOCOLS<br /><ul><li>SMTP, DNS, HTTP, FTP, Telnet, RIP, etc.
MP3, JPG, (Compression), encryption, etc.
NTFS, SQL, RPC, NetBios, UDP, NCP, ADSP, etc.
TCP, UDP, NWLink, SPX, NBP, ATP, SPP, etc.
IPX, RIP, DDP, RTMP, IP, ARP, RARP, ICMP, OSPF,etc.
802.3 Ethernet, 802.5 Token Ring, 802.11 Wireless, FIDDI X.25, STP, etc.
Electronic, radio or optical impulses</li></ul>7 Layers<br />Application<br />Presentation<br />Session<br />Transport<br ...
Message
Message
Segment
Packet
Frame
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The Osi Model And Layers

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OSI Model and the 7 Layers for Networking

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Transcript of "The Osi Model And Layers"

  1. 1. The OSI Model<br />Open Systems Interconnect <br />
  2. 2. The 7 Layers of OSI<br />PURPOSE<br /><ul><li>Interfaces with Applications
  3. 3. Data translation & prep for network
  4. 4. Estab. & Maintain Comm link
  5. 5. Breaks down mssg to send
  6. 6. Adds logical address info
  7. 7. Adds Physical Addressing
  8. 8. Converts to Signal and sends</li></ul>PROTOCOLS<br /><ul><li>SMTP, DNS, HTTP, FTP, Telnet, RIP, etc.
  9. 9. MP3, JPG, (Compression), encryption, etc.
  10. 10. NTFS, SQL, RPC, NetBios, UDP, NCP, ADSP, etc.
  11. 11. TCP, UDP, NWLink, SPX, NBP, ATP, SPP, etc.
  12. 12. IPX, RIP, DDP, RTMP, IP, ARP, RARP, ICMP, OSPF,etc.
  13. 13. 802.3 Ethernet, 802.5 Token Ring, 802.11 Wireless, FIDDI X.25, STP, etc.
  14. 14. Electronic, radio or optical impulses</li></ul>7 Layers<br />Application<br />Presentation<br />Session<br />Transport<br />Network<br />Data link<br />Physical<br />PDU<br /><ul><li>Message
  15. 15. Message
  16. 16. Message
  17. 17. Segment
  18. 18. Packet
  19. 19. Frame
  20. 20. Bit</li></li></ul><li>Levels of The 7 Layers<br />
  21. 21. The Layered Flow<br />
  22. 22. Breaking it down into Bits… <br />
  23. 23. How do the layers talk?<br />Sevice Access Points (SAP) – an address in memory that acts as a conduit between the two entities.<br />
  24. 24. The Application Layer<br />Acts as an interface between user apps and the network<br />PDU of the layer is a message<br />The first line of command for a process called flow control<br />Making sure data moves at a rate acceptable to both parties involved in the transfer<br />
  25. 25. Application Layer Protocols<br />Network Terminal Protocol (Telnet)<br />File Transfer Protocol (FTP)<br />Simple Mail Transfer Protocol (SMTP)<br />Post Office Protocol (POP)<br />Domain Names Services (DNS)<br />Hyper Text Transfer Protocol (HTTP)<br />Routing Information Protocol (RIP)<br />AppleShare<br />
  26. 26. Presentation Layer<br />Makes sure data is in the correct format<br />Manages uniform character sets<br />Handles data encryption<br />Manages data compression<br />
  27. 27. The Session Layer<br />Sets up and breaks down virtual connections between communicating devices<br />Maintains connection while it is active<br />Juggles multiple open connections at the same time<br />
  28. 28. Session Layer Protocols<br />Network File System (NFS) <br />Structured Query Language (SQL) <br />Remote Procedure Call (RPC)<br />X Window<br />Network Basic Input/Output Services (NetBIOS)<br />User Datagram Protocol (UDP)<br />NetWare Core Protocol (NCP)<br />AppleTalk Session Protocol (ASP)<br />AppleTalk Data Stream Protocol (ADSP)<br />
  29. 29. The Transport Layer<br />Breaks data stream down into manageable chunks called segments<br />Performs packet-level error detection/ correction<br />Monitors time to live (TTL) to determine if packets have been lost<br />Handles end-to-end flow control<br />
  30. 30. Transport Layer Protocols<br />Transmission Control Protocol (TCP)<br />User Datagram Protocol (UDP)<br />NWLink<br />Sequenced Packet Exchange (SPX) <br />Name Binding Protocol (NBP)<br />AppleTalk Transaction Protocol (ATP)<br />Zone Information Protocol (ZIP)<br />Sequenced Packet Protocol (SPP)<br />Packet Exchange Protocol (PEP)<br />
  31. 31. The Network Layer<br />Manages traffic between different networks<br />Controls network addressing functions<br />Responsible for routing<br />PDU of the Network layer<br /> The packet<br />
  32. 32. Network Layer Protocols<br />Internetwork Packet Exchange (IPX) <br />Routing Information Protocol (RIP) <br />Datagram Delivery Protocol (DDP)<br />Routing Table Maintenance Protocol (RTMP) <br />Internet Protocol (IP)<br />Address Resolution Protocol (ARP)<br />Reverse Resolution Protocol (RARP)<br />Internet Control Message Protocol (ICMP)<br />Open Shortest Path First (OSPF)<br />
  33. 33. The Data Link Layer<br />Subdivided into to sub-layers<br />Media Access Control (MAC)<br />Logical Link Control (LLC)<br />Determines methods by which data moves across the medium<br />Defines network access methods<br />
  34. 34. Data Link Protocols<br />802.3 Ethernet<br />802.3u Fast Ethernet<br />802.3.z Gigabit Ethernet<br />802.5 Token Ring<br />802.11 Wireless Signaling<br />802.12 Demand Priority<br />Integrated Services Digital Network (ISDN)<br />Fiber Distributed Data Interface (FDDI)<br />X.25<br />
  35. 35. The Physical Layer<br />Defines the network media<br />Defines the physiology of connectors and plugs<br />Places the data onto the wire as bits<br />
  36. 36. Putting it all together!<br />PURPOSE<br /><ul><li>Interfaces with Applications
  37. 37. Data translation & prep for network
  38. 38. Estab. & Maintain Comm link
  39. 39. Breaks down mssg to send
  40. 40. Adds logical address info
  41. 41. Adds Physical Addressing
  42. 42. Converts to Signal and sends</li></ul>PROTOCOLS<br /><ul><li>SMTP, DNS, HTTP, FTP, Telnet, RIP, etc.
  43. 43. MP3, JPG, (Compression), encryption, etc.
  44. 44. NTFS, SQL, RPC, NetBios, UDP, NCP, ADSP, etc.
  45. 45. TCP, UDP, NWLink, SPX, NBP, ATP, SPP, etc.
  46. 46. IPX, RIP, DDP, RTMP, IP, ARP, RARP, ICMP, OSPF,etc.
  47. 47. 802.3 Ethernet, 802.5 Token Ring, 802.11 Wireless, FIDDI X.25, STP, etc.
  48. 48. Electronic, radio or optical impulses</li></ul>7 Layers<br />Application<br />Presentation<br />Session<br />Transport<br />Network<br />Data link<br />Physical<br />PDU<br /><ul><li>Message
  49. 49. Message
  50. 50. Message
  51. 51. Segment
  52. 52. Packet
  53. 53. Frame
  54. 54. Bit</li>

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