Networks

Networks

1. Pros

   • Allows for easy sharing of information.
   • Resources such as printers and internet access can be shared
   • Files can be shared across the entire network
   • Updates only need to be downloaded on one computer

2. Cons

   • If a hacker hacks one computer, then they can hack all of them
     • The same problem occurs with viruses
   • It can have a very large initial installation cost
   • They require a lot of expertise to maintain.

3. LAN

   • Local Access Network
   • Normally contained within a singular place or organization

4. WAN

   • Wide Access Network
   • Is normally contained in a large place or multiple organiztions
     • They are normally made of multiple LANs connected together

5. Topology

   • Bus
     • Pros
       • Cheap to install
     • Cons
       • High chance of failure
       • Lots of collisions
       • Slows down as more computers are added
   • Ring
     • Pros
       • Cheap to install
       • Fast
     • Cons
       • High chance of failure
       • Difficult to expand
   • Star
     • Pros
       • Low chance of failure
       • Fast
     • Expensive
     • Depends on a switch
   • Mesh
     • Pros
       • Messages can be received more quickly if the route to the intended recipient is short
       • Messages should always get through as they have many possible routes on which to travel
       • Multiple connections mean - in theory - that no node should be isolated
       • Multiple connections mean each node can transmit to and receive from more than one node at the same time
       • New nodes can be added without interruption or interfering with other nodes
     • Cons
       • Full mesh network toplogies can be impractical to set up because of the high number of connections needed
       • Having many connections means that a lot of maintenance is required
       • A large part of the network may be redundant if there are better routes to connect nodes, making some connections unnecessary

6. IP Adresses

   • An IP address is a unique identifier given to a computer
   • Messages on a network have an IP address attached, which is how a computer knows whether or not to keep the message
   • Houses and businesses have their own Ip address, and the computers within have their own unique to that network

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