Wired and wireless networks #2

Wired and wireless networks #2

1. LAN

   • Advantages
     • Sharing resources such as printers
     • Access any files from computer in network
     • Data is easy to back up as it is stored centrally on the server
   • Disadvantages
     • Hardware expensive
     • complicated management
     • Vireses may infiltrate network and damage every computer
   • Star and mesh topologies
   • One or two servers
   • Small geographical area

2. WAN

   • Covers large geographical area
   • used by google
   • Used with sattelites, cables and telephone lines
   • Resorces supplied by a '' third party carrier

3. WIFI frequencies

   • 2.4 GHZ, 3.6GHZ, 4.9GHZ, 5GHZ, 5.9GHZ

4. Client-server

   • advanteges
     • backed up centrally
     • secure: backed up to one location
     • log in from any computer

5. Peer to peer networks/P2P

   • if computer switched off, data cannot be retrieved
   • viruses
   • each computer has to have its own backup system

6. The internet

   • Packet switching
     • File broken up into packets. each contains:

7. Protocols

   • HTTP
     • Accesses and receives web pages in the form of HTML files
   • HTTPS/secure

Imagens e arquivos do mapa