networks

networks

1. types of networks:

   • LAN
     • local area network
   • WAN
     • wide area network

2. disadvantages

   • expensive- hardware and wired needed
   • more room for error- something spreads between every computor
   • difficult- it requires technical expertese.
   • malware- viruses can spread through the network.

3. networks allow computors to

   • SHARE FILES- the same files are available anywhere.
   • SHARE RESOURSES- such as printed and internet connections
   • SHARE LOGINS- so the same usernames and passwords can be used on every computer on the network.

4. networks inforce policies for their users and for the computers.

5. keywords

   • networks
     • topology
   • WAN
   • LAN
   • ip address
   • star
   • bus
   • rings

6. what is a platform?-

   • a group of computers connected together

7. topology

   • star topology- all computers are connected to a central switch.,
     • advanteages-fast, easy to add computers, low chance of catestrophic failure.
     • disadvamtages- expensive, failure of the switch will take down the whole network.
   • bus topology- all connected in a line, if one computer gets a virus the whole network get one too.
     • advantages- cheap to install
     • diadvantages- high chace of catestrohic failure, lots of collision, slows down as more computers are added.
   • ring topology- all goes in one direction, connected by a ring
     • advantages- less colisdion, cheap to install.
     • disadvantages- high chance of catestophic failure, diffficult to add new cmputers.

8. what is an ip adress?

   • an ip adress is a unique, value assigned to every computer on a network.
   • message on a network have an ip adress attatched, which is how computers knows whether or not to keep the message.

9. internet

   • the interenet is arraged with devices in mesh topology
   • mesh topolology has excellent resillience to outages.
   • a cost is assigend to each connection in a mesh.
   • route - finding algoristhm are used to find lowest cost route between two nodes.
   • packets
     • all data and the internet is split up into small chunks called packets.

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