HUBS

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HUBS SWITCHES WHAT FOR ART THOU?By Wayne
SheppardETEC 562
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HUBS SWITCHES DEFINED

• These simple, affordable but effective small
  boxes provide a central connection point for the
  networking of multiple computers.
• Hubs small, simple, inexpensive devices that
  join multiple computers together at a low-level
  network protocol layer.
• Switches-same as hubs, except they operate with
  additional intelligence above that offered by
  hubs.

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Some Characteristics of Hubs

• Require bandwidth to be shared while switches
  offer a dedicated connections
• Hubs can be managed or unmanaged
• Hubs are sometimes referred to concentrators
• A hub is a multi-port repeater

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Managed vs. Unmanaged

• Managed hubs are usually not for home use. They
  have special networking computers built into them
  that do things that you will not need at home or
  small office.
• They are also more expensive than switches.
• Unmanaged hubs and switches are simple devices
  that let your Ethernet devices talk to each other.

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Three Types of Hubs

• Passive-These hubs only restrain data
• Active Hubs-They amplify the signal before it is
  retransmitted
• Intelligent Hubs-These hubs are stackable and
  typically include remote management support via
  SNMP, and virtual LAN(VLAN) support

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10/100 Ethernet Hub

• A 10/100 mbps is a good choice for basic home
  networks. The 10Mbps and 100Mbps devices
  communicate at different speeds, and the hub
  allows them to talk. Prices have come down to
  under 50, the versatility and speed of these
  hubs cannot be beat for the price.
• However, hubs are half duplex-each client can
  only send or receive date at a particular time.

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SWITCHES

• Work on layer 2 of the OSI model.
• Only forwards data to specific network segment.
  This results in multiple, smaller collision
  domains, and more efficient bandwidth usage.

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10/100 Ethernet Switch

• A 10/100 Ethernet switch can be considered a
  faster version of the 10/100 hub.
• Switches allow your Ethernet cards to operate in
  full duplex instead of half duplex.
• Full duplex means you can send and receive data
  at the same time.
• Switches also route traffic directly between
  ports instead of directing traffic across all
  ports.
• This means that each port on a switch gets
  dedicated bandwidth instead of shared bandwidth.

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PORT NUMBERS?

• Where port numbers are concerned, consider an
  analogy between computer and the telephone. Port
  numbers and their associated network addresses
  work something like telephone numbers and
  associated extensions.
• A port number identifies both a computer and also
  a channel within that computer where network
  communication will take place.

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SOUCES

• WWW.COMPNETWORKING.COM
• WWW.HOMENETHELP.COM