Networks

Networks

1. Disadvantages

   • Viruses Spread Quicker
   • If One Computer Is Hacked All Can Be Hacked
   • More Expensive
   • Harder And Longer To Set Up
   • Messages Might Have To Go Through Multiple Computers

2. Advantages

   • Work Spreads Quicker
   • Easier To Ban Things
   • Harder To Hack Into
   • You Can Log Onto Any Computer
   • Files Are On Every Computer On The Network

3. Types Of Networks

   • WAN
     • Wide Area Network (Multiple LAN Networks)
   • LAN
     • Local Area Network

4. Topology

   • Bus
     • A Cable Through All Computers In A Straight Line
       • Advantages
         • Easy To Add New Computers
         • Cheap
       • Disadvantages
         • Messages Can Collide
         • If The Wire Breaks It All Goes Down
   • Ring
     • All Computers Through A Single Circular Cable
       • Advantages
         • Cheap
         • Easy To Set Up
       • Disadvantages
         • One Cable Breaks It All Goes Down
         • Messages Can Collide
   • Star
     • Each Computer Has A Cable To A Switch
       • Advantages
         • Messages Can Not Collide
           • Easy To Add New Computers
       • Disadvantages
         • Expensive
         • If The Switch Breaks It All Goes Down

5. IP Addresses

   • IP Addresses Are Personalised And Certain To One Computer
   • There Is A Maximum Of 4 Billion IP Addresses
     • This Applies To Phone And Ipads
   • If A Message Is Sent It Will Show The IP Address Of The Sender
     • Also Makes It So That Messages Don't Get Sent To The Wrong Person

6. The Internet

   • A Giant Mesh Network
   • Spans The Entire World
   • Things Sent Through The Internet Are Broken Into Packets
   • Each Time A Item Is Sent It Has A Cost Which We Call Lag