Networks

Networks

1. Types Of Network

   • LAN
     • local area network
     • network in a small area or single orgonisation
   • WAN
     • wide area network
     • a network that spans a large area

2. Advantages of a network

   • share files
     • same files are acsesable of diffrent computers
   • share resorces
     • share printers
     • share internet connections
   • share logins
     • same username and passwodrs
     • they can be used on any computer

3. disadvantages of a network

   • cost
   • increased risk
   • difficulty
     • experts are needed
     • need to maintain it

4. Topologies

   • Ring advanteges
     • Computes are connected to each other in a ring
     • communication only goes in one direction
     • each computer recives a message and if its not the intened recipientit passes it onto the next computer
     • No central cable each connection is between two computers
     • this solves the bus collision problem
   • Bus advantages
     • network consits of a single cable that runs through the network
     • all devices attach to ths singlev cable
   • star advantages
     • all computers connected to the cental switch
     • very fast
     • easy to add computers
   • Ring dissadvantages
     • high chance of catastophic falure
     • difficult to add new computers
   • bus disadvantages
     • if the cablebreaks there is a catostrophic faliure
     • it will take longer because there is only one cable
   • star dissadvantages
     • very expensive
     • faliure of swich will take down thw wholw system

5. IP adressses

   • adressing
     • an adress is a uniqe identification given to somthing
     • a house is a example of a adress
     • computers on a network also use adresses to identify
     • when a computer is added to a network it gets a IP adress
   • Network navigation
     • all mesages sent over tyhe network has both the senders and the recivers IP adress
     • each computer that recives a message checks the IP adress
     • if it fits the computer keeps the message and uif it dose not it either passes it on or deletes it
   • IP adress formatb
     • the ip adress is a 32 bit bianary value
     • this means its made up of thirty two ones or zeros