difference between Repeater,hub,bridge, switch,router, gateway

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Hi all

 as far as i understand the difference between Repeater,hub,bridge,
switch,router, gateway are as follows , how correct is my
understanding ?

  Repeater

  Forwards every frame it receives
  it is a generator,not an amplifier(i.e it removes noise &
regenerates signal )
  Bi-directional in nature
  Useful in increasing ethernet size/length
  Maximum of 5 Repeaters in an Ethernet

  Hub

  basically a multiport repeater
  can be used to divide a single LAN into multiple levels of Hierarchy



  Bridge

  connect similar/dissimilar LANS
  Designed to store and forward frame
  Protocol independent
  Transparent to End Stations
  Operates in Layer-1 & Layer-2
  uses a table for filtering/routing
  does not change the Mac address in the frame
  two types of bridges are there Transparent/source routing

  Switch

  A fast Bridge.
  Common forwarding approaches used include Cut through,collission
free & Fully buffered


  Routers

  Links dissimilar n/ws
  not transparent to end stations
  acts on a network layer frame
  isolates LAN to subnets to manage & control traffic


  Gateway

   uses Layer -7 Relay


Re: difference between Repeater,hub,bridge, switch,router, gateway
James Harris wrote:

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(snip)

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There are different rules for different ethernet media, but I
believe 5 is right for 10baseT.  In the usual 10baseT case it
is determined by loss of inter-packet gap, and not by round trip
time limits for collision detect.  Even with six 150m cables
you will still be below the time limit.

Five is convenient as it allows for a central repeater connected to
repeaters, each connected to more repeaters.

-- glen
mo

-- glen


Re: difference between Repeater,hub,bridge, switch,router, gateway
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hmmm - I undersood that repeaters were permitted to,
and did, eat the preamble during clock synchronisation
and that this was a constraint to the number of repeaters.

5 is correct by the way.

I have the idea that later repeaters synchronised
more quickly and ate fewer bits but that the standard
was not changed.

Not at all sure tho' and to be honest no longer care:)

Seems like a homework question.

Re: difference between Repeater,hub,bridge, switch,router, gateway
bod43 wrote:
(snip, I wrote)

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Well, there are the model 1 rules and the model 2 rules.
The model 2 rules are more exact and more complicated.

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Yes, by now if you are still using multiple repeaters, you should
at least have one switch which allows for a really large number
of repeaters.

-- glen


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