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

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
Reply to
annalissa
Loading thread data ...
(snip)
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
Reply to
Glen Herrmannsfeldt
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.
Reply to
bod43
(snip, I wrote)
Well, there are the model 1 rules and the model 2 rules. The model 2 rules are more exact and more complicated.
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
Reply to
Glen Herrmannsfeldt

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