Networks 2

Networks 2

1. Factors Influencing Network Choice

   • Cost
     • Server
     • Cabling
     • Routers
     • Software
     • Broadband Cost
   • Size of organisation
     • WAN or LAN
   • How the system will be used
     • WAN or LAN
   • Existing systems
     • Network will have to work with existing hardware and software
   • Performance required
     • Determines the topology used
     • E.G. E-commerce needs to be fast
     • Measures of network performance
       • Speed
       • Cost
       • Reliability
       • Usability
   • Security issues
     • Restrictions to access data, websites and programs
     • Virus and hacker protection

2. Main Types of Networks

   • Client Server
     • Advantages
       • Computers aren't all equal status, different access levels
       • Central administration
       • Central store of programs and data
       • Improved security
       • Central backups
       • Fast access to data and programs
       • Used for small or large networks
     • Disadvanatges
       • Specialist knowledge needed
       • Need a network manager
       • Expensive
       • Sophisticated software
       • If server breaks down, the whole network goes down
   • Peer-to-Peer
     • Advantages
       • No network manager needed
       • Cheaper than CS (No Server)
       • Users specify what resources are available
       • Low operating costs
       • Easy to set up
       • No reliance on server
     • Disadvantages
       • Poor security (compared to CS)
       • No central backups
       • Need more IT knowledge
       • Only suitable for 15 or under computers
       • Difficulty finding files as they aren't central and organised