1.5 - Network Topologies !josh

1.5 - Network Topologies !josh

1. Mesh Network

   • A network where all devices are connected directly to each other

2. Star Network

   • A Network where all devices are connected to a server by an individual wire.
   • Benefits: reliable, fewer data connections, easy to add more devices, relatively fast.
   • Disadvantages: central devices failing causes it all to fail, high level of dependance on switch /server.

3. Ethernet vs WIFI

   • Benefits of ethernet
     • Stable connection
     • Less chance of being hacked
     • More secure
     • Faster traffic speed
     • Usually has a good signal quality
   • Benefits of WIFI
     • Cheap set up cost
     • More vulnerable to hacking
     • Quality of signal is affected through walls and other obstructions
     • Interference can occur
     • User can move around.
     • Has slower transfer speeds

4. Encryption

   • Is a method of scrambling data with a key code that makes no logical sense

5. What is a network?

   • It is a number of devices linked together to share resources - hardware, software and data

6. IP address

   • Unique string of numbers separated by full stops which identifies every device using Internet Protocol to communicate over a network.
     • Can be changed

7. MAC addresses

   • Media Access Control
     • Uniquely identify the specific device being used by identifying the network adapter.
   • Come with the device when bought, embedded in during manufature.
     • Can't change it
   • Built into a Network Interface Card (NIC)

8. Protocols

   • A set of rules/conventions that control the communication between devices on a network
   • Key Protocols include:
     • TCP/IP
       • Transmission Control Protocol/Internet Protocol
         • A set of rules that control the connection of a device to the internet
     • HTTP
       • Hyper Text Transfer Protocol
         • Rules used when transferring data
         • HTTPS is is encrypted and HTTP is transmitted over the internet in an unsecure manner
     • HTTPS
       • Hyper Text Transfer Protocol Secure
         • A more secure HTTP
     • FTP
       • File Transfer Protocol
         • Rules that have to be followed when transfering files
     • POP
       • Post Office Protocol
         • Rules followed to retrieve e-mails from a mail sever
     • IMAP
       • Image Message Access Protocol
         • POP over a TCP/IP connection
     • SMTP
       • Simple Mail Transfer Protocol
         • The internet standard for e-mail

9. Packet Switching

   • All data sent through devices is sent in packets.
     • It is broken into packets and given a header which contains the IP adress of the network that it is being sent to.
       • It also contains the IP adress of where it was sent from
       • The header also contains a number out of the total packet-making it easier to reassemble
       • Sometimes packets get lost so the computer has to request that the packet is sent again, if it never arrives, then the router deletes it

10. Layers

    • As a packet is prepared, the data travels through layers where protocols manage it, adding or removing extra info as required
    • Used to which ensure data exchanged are in correct and understandable form.

11. Packets

    • Contain:
      • IP address
      • receiver's IP address
      • payload
      • number of packets and sequence of them
      • Error detection

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