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Understanding Network Topologies and Cable Connections

This guide covers basic network topologies, including bus and extended star configurations, emphasizing their impact on Ethernet traffic at workstations. It discusses UTP cable types and their dependency on connected devices, detailing the distinctions between crossover and straight-through cables. Learn how to connect network interface cards (NICs) and hubs efficiently, including the use of uplink ports on hubs for versatile connections. Quizzes reinforce key concepts, ensuring a solid understanding of cable types and correct configurations for successful networking.

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Understanding Network Topologies and Cable Connections

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  1. Chabot College ELEC 99.05 Network Topologies & Connections

  2. Toplogies and Connections • Differing physical topologies yield equivalent ethernet traffic at the workstation. • For UTP connections, cable type depends on the types of devices connected.

  3. Bus Topology

  4. Extended Star Topology

  5. Equivalent Ethernets

  6. Crossover Cable • Transmit pair “crosses over” to Receive pair.

  7. Crossover Cable • Connects NIC to NIC. • Connects hub to hub.

  8. Straight-Through Cable • Connects NIC to hub.

  9. Straight-Through Cable • When connecting two PCs via a hub, straight-through cables are used. Where does the crossover occur? • In the hub!

  10. Cabling Example

  11. Hub Feature • Most hubs have a special “uplink port” that can be switched from crossover to straight-through function. • Usually, the uplink is port 1. • The uplink allows use of straight-through cables throughout all connections.

  12. Hubs with Uplink

  13. Quiz • NIC to NIC - what type cable? • Crossover • NIC to hub - what type cable? • Straight-through

  14. Quiz • Hub to hub - what type cable?? • Crossover • Hub uplink port to hub - what type cable? • Straight-through

  15. Quiz • On most hubs, which port is the hub uplink on? • Port 1 • Could I attach a workstation NIC to the uplink port? • Sure - just use a regular straight-through cable. If necessary, change the setting on the uplink port switch!

  16. Quiz • How can I tell if the hub’s uplink port switch is set correctly for the type of cable & device attached? • Look for link light!

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