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

Hi all

as far as i understand the difference between Repeater,hub,bridge,
switch,router and 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
.

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