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Network Communications Chapter 14

Network Communications Chapter 14. LAN Interconnection Devices. LAN Interconnection Devices. Repeater: Layer 1 (Physical) Bridge: Layer 2 (Data Link) Switch: Layer 2, 3, or 4 (Transport) Router: Layer 3 (Network) Gateway: Layer 7 (Application) CSU/DSU: LAN to WAN connection. Physical

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Network Communications Chapter 14

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  1. Network CommunicationsChapter 14 LAN Interconnection Devices

  2. LAN Interconnection Devices • Repeater: Layer 1 (Physical) • Bridge: Layer 2 (Data Link) • Switch: Layer 2, 3, or 4 (Transport) • Router: Layer 3 (Network) • Gateway: Layer 7 (Application) • CSU/DSU: LAN to WAN connection

  3. Physical Layer Physical Layer Connecting LAN Segments with a Repeater Figure 14.1

  4. Bridge Data Link Data Link Physical Layer Physical Layer OSI Reference Model for a Bridge • Homogeneous Network Expansion Figure 14.2

  5. Bridge Port #1 Port #2 Bridge Types • Learning (Transparent)Bridge • Requires no administration • Discovers connectedterminals • Source routing bridge • Used in token ring networks • Follows the information in the frame header Figure 14.3

  6. Router Network layer Network layer Data Link Data Link Physical Layer Physical Layer Router OSI Reference Model • Works at the Network Layer • Can handlenon-homogeneousnetworks • Determine “best”data path for eachframe Figure 14.4

  7. Routers Connecting LANS • Static Router • Manualadministration • Dynamic Router • Automatic • Exchangesinformation with peers • Standard protocol and algorithm (Dykstra) Figure 14.5

  8. Application Application Presentation Presentation Session Session Transport Transport Network Network Data Link Data Link Physical Layer Physical Layer SNA TCP/IP Gateway • Works at the application layer • A high-levelprotocol converter Figure 14.6

  9. Switch • Already covered in chapter 12

  10. CSU/DSU • Channel Service Unit/Data Service Unit Figure 14.7

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