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Semester 1 CHAPTER 3 Le Chi Trung

Semester 1 CHAPTER 3 Le Chi Trung. Content. Basic LAN devices Basics of data flow through LANs. Schedule. BASIC LAN DEVICES. Are you able to describe this diagram?. Physical & Logical Topologies. Physical topologies Define the actual layout of the wire (media) Logical topologies

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Semester 1 CHAPTER 3 Le Chi Trung

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  1. Semester 1CHAPTER 3Le Chi Trung

  2. Content • Basic LAN devices • Basics of data flow through LANs

  3. Schedule

  4. BASIC LAN DEVICES

  5. Are you able to describe this diagram?

  6. Physical & Logical Topologies • Physical topologies • Define the actual layout of the wire (media) • Logical topologies • Define how the media is accessed by the hosts

  7. Physical Topologies Extended Star Bus Ring Hierarchical Star Mesh

  8. Physical Topology: Bus • Single backbone • All hosts directly connected to backbone • Each end of the bus must be properly terminated

  9. Physical Topology: Ring • No backbone • A host is directly connected to each of its neighbors

  10. Physical Topology: Star • All devices connected to a central point • Center of star is usually a hub or a switch

  11. Physical Topology: Extended Star • Connects individual star topologies together. • At the center of the star is a hub or a switch. • Extends the length and size of the network.

  12. Physical Topology: Hierarchical • Like the extended star except a computer controls traffic (not a hub or a switch).

  13. Physical Topology: Mesh • Each host has its own connection to every other host. • Used in situations where communication must not be interrupted.

  14. Logical Topologies Broadcast Token Passing

  15. Logical Topology:Broadcast • Each host on the LAN sends its data (or broadcasts its data) to every other host. • First-come, first-serve.

  16. Logical Topology:Token Passing • Access to media is controlled by an electronic token. • Possession of the token gives the host the right to pass data to its destination.

  17. Technologies Ethernet FDDI Token Ring

  18. Technology: Token Ring Token Ring Token Passing

  19. Technology: FDDI FDDI Token Passing

  20. Technology: Ethernet Ethernet Broadcast

  21. NIC Computer Server Printer Hosts

  22. LAN Media Symbols Token Ring Ethernet Line FDDI Ring Serial Line

  23. OSI Review: Layer 1 • Responsibility: • Transmission of an unstructured bit stream over a physical link between end systems. • Concerned: • Bits. • Electrical specifications. • Physical data rate. • Distances. • Physical connector.

  24. UTP AUI BNC LAN Device: Transceiver • Connect different media technologies. • Layer 1 device.

  25. LAN Device: Repeater • Regenerates and repeats the signal. • Layer 1 device.

  26. LAN Device: Hub • A multi-port repeater. • Layer 1 device.

  27. OSI Review: Layer 2 • Responsibility: • Provides for the reliable transfer of data cross a physical link. • Concerned: • Frames. • Physical address (HW or MAC): Flat. • Line discipline. • Error and flow control. • “Segment”.

  28. LAN Device: NIC • Network interface of hosts. • Build-in physical address. • Layer 2 device.

  29. LAN Device: Bridge • Keeps traffic local by filtering traffic based on physical addresses. • Layer 2 device.

  30. LAN Device: Switch • A multi-port bridge. • Layer 2 device.

  31. OSI Review: Layer 3 • Responsibility: • Connection and path selection between two end system across networks. • Concerned: • Packets. • Logical address: Hierarchical. • Networks and Hosts addressing. • Route , Routing table, Routing protocol. • “Network”.

  32. LAN Device: Router • Makes decisions based on network addresses (logical addresses). • Layer 3 device.

  33. LAN Device: Router Functions • Path determination: • The process of evaluating a packet’s destination IP address so that the router can decide which port to send out the packet. • Packet switching: • The router re-encapsulates the packet in the protocol needed for the specified port and then switches the packet out that port.

  34. LAN Device: Cloud • Another network • Include layer 1 – 7 devices

  35. Devices function at Layers

  36. Teaching Topology

  37. History of Networking Homework

  38. Review • Physical and logical topologies. • LAN devices.

  39. DATA FLOW THROUGH LANs

  40. Air Mail Example

  41. Encapsulation

  42. Encapsulation: Example

  43. Host to host communication

  44. Packet Flow: Layer 1 Device

  45. Packet Flow: Layer 2 Device

  46. Packet Flow: Layer 3 Device

  47. Packet Flow: Layer 1-7 Device

  48. Packet Traveling Over Network Homework

  49. Preparation for LAB • 3.4.1: Readiness. • 3.4.2: Building a simple network. • Lab companion: • 3.4.2

  50. Review • Encapsulation. • Data flow.

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