Networks

Networks

1. Pats of a network

   • Cables
   • Connectors
   • Network software
   • Network interface card

2. What is a network?

   • A network is an interconnected collection of computers.

3. Types of networks

   • LAN - Local Area Network
   • WAN - Wide Area Network

4. What is a Typology?

   • The arrangement of computers in a network.
   • Examples
     • Bus
       • Pros : If one node fails the others aren't effected. Simple and easy to set up.
       • Cons : If the cable malfunctions, the networks goes down. Cables and numbers of nodes are limited.
     • Star
       • Pro : If one system beaks it doesn't effect the network.
       • Con : It is dependent of the central computer, and wiring is expensive.
     • Ring
       • Pros : Easy to access/transmit data, and doesn't require a server. It works better than star.
       • Cons : One malfunctioning node can stop the whole network. It is also slower than Ethernet. Moving, adding, and changing devices can be straining.
     • mesh
       • Cons : If one node fails, the others all fail as well.
       • Pros : Data can easily be shared as all nodes are interconnected to one another.

5. Protocols

   • TCP/IP
     • rather than routing, checking, re-assembling and forwarding packets a tcp/ip stack is used as it is a less complex method
       • The stack is:
         • application layer
           • transport layer
             • network layer
               • data link player
                 • physical layer
                   • transmits and receives bits
                 • prepares and corrects data to be passed to the physical layer
               • provides network addressing and routing (ip addresses)
             • handles data-consistency functions (error checking)
           • provides application services to users and programs
   • a protocol is a set of rules and regulations that allow electronic devices to communicate physically and over a network