Networks

Networks

1. LAN

   • Used for one area or company

2. WAN

   • Used for wide areas and multiple companys and people. The www is one of these

3. Topologies

   • Bus
     • Computers connected to one wire and there are terminators at either end of the main wire
   • RIng
     • Computers are connected in a ring formation and each computer is connected to at least two others
   • Star
     • Or computers are connected to a central wire or switch
   • Mesh
     • Circuit switching
       • eg. Telephone. all data arrives at the same speed on the same network
     • Packet switching
       • Pathfinding
       • Data is split into packets and numbered to be rearranged at the destination
     • All computers are connected to at least two others

4. Protocols

   • Standard protocols
     • HTTP(Hypertext transfer protocol)
       • Requests HTML file from a websever
       • HTTPS
         • Secure version of HTTP
     • FTP
       • File transfer protocol for transferring files between computers
     • POP3(post office protocol)
       • Protocol for downloading mail from a server(receive)
     • SMTP(Simple mail transfer protocol)
       • Send(Email)
     • IMAP
       • Internet message access protocol. Replaced POP3