Mapa mental
comuunications part 2
Conteúdo do mapa
comuunications part 2
topoligies
- there are four different layouts in which we can connect computers into a network
- bus topoligy
- A single cable connects all the computers
- advantages
- chaep
- easy to install
- no extra equipment required
- chaep
- disadvantages
- high chance of collisions
- more computers mean more collisions
- damage to the wire results in catostrophic failure
- only suitable for small networks
- high chance of collisions
- ring topoligy
- network configuration in which device connections create a circular data path.
- advantages
- no collisions
- number of computers does not affect speed
- disadvantages
- only faulty computers will result in catostrophic
- more difficult to add computers
- star networks
- all computers are connected to a central hub or switch
- advantages
- no collisions
- failure of a cable or computer is not catadtrophic
- easy to add new computers
- disadvantages
- expensive (requires hub/switch and lots of cabling
- failure of hub/switch of lots of cabling
- mesh topoligy
- each computer is connected to one or more other computers
- advantages
- zero catastrophic failure
- multiple transmissions can happen simultaneously.
- disadvantages
- redundancy - lots of unnecessary connections
- expensive
- difficult to maintain and administer
circuit switching
- a path across the network is established
- advantages
- data arrives in the order it was sent
- data arrives at a consistent speed
- can start reading transmissions as soon as the first bit arrives as data arrives sequently
- disadvantages
- only one transmission at a time along each channel clog the network
pocket switching
- the data is split into lots of small chunks called packets
- advantages
- multiple transmissions can happen simultaneously
- large transmissions don't clog the network
- disadvantages
- lag is needed to allow several packets to arrive before reading as the first packet sent may not to be the first packet recieved