Understanding Switches

Video Class 22 Comments on Understanding Switches 166


  • Level: Beginner
  • Presenter: Eli the Computer Guy
  • Date Created: July 12, 2010
  • Length of Class: 57 Minutes



Purpose of Class

  • This class discusses the purpose of network switches and their functions.

Topics Covered

  • Switches vs. Hubs
  • Managed vs. Unmanaged Switches
  • Speeds and Duplex
  • Quality of Service
  • Power Over Ethernet
  • VLAN
  • Spanning Tree Protocol

Class Notes

  1. Basic Switch Concepts
    1. A hub simply splits the Ethernet signal like a cable splitter
    2. Broadcast storms happen when too many computers are trying to talk at once
    3. Switches allow multiple computers to be able to talk at the same time.
    4. Switches are OSI Model layer 2 devices and use network devices MAC Addresses for identification
  2. Managed vs. Unmanaged Switches
    1. Unmanaged switches are completely automatic
    2. Managed switches can be configured
  3. Speed
    1. Speeds – 10Mbps / 100Mbps / 1000Mbps
    2. Full Duplex means a device can send and receive traffic at the same time
    3. Half Duplex means a device can either receive or transmit traffic
    4. Backplane determines how much total data a switch can handle
  4. Trunk Connection allow multiple switches to be tied together
  5. VLANs are separate LANs on the same switch
  6. POE – Power Over Ethernet allows you to power network devices using cat5 cable
  7. QOS/ COS – allows you to prioritize network packets so that real time communication is not interrupted by file transfers.
  8. Spanning Tree Protocol is a networking protocol that helps prevent network loops



Eli the Computer Guy

Eli the Computer Guy has 16 years experience in technology being the guy to fix "it". From the Army, to building out new satellite offices for the enterprise, to running his own shop with 9 full time employees Eli has real world experience with almost all systems that technicians will be working with. Eli has 1600 hours of formal technical beyond his Bachelors Degree in Criminal Justice on technologies ranging from Avaya PBX/ Audix to Microsoft, Red Hat Linux, MySQL, Cisco and much more.

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