1.5 Network Topologies

1.5 Network Topologies

1. A computer network is a number of computers linked together

   • This allows them to share resources (hardware, software and data)
   • what does a packet contain:
     • a life
       • an IP address
         • Packet number/sequence
           • Payload

2. Topology is the arrangement of a computer system

3. A Mesh Network is when all devices are directly connected to eachother

   • mostly used to connect nodes to exchange data

4. A Star Network is when each device is connected by individual cables to the server

5. WIFI is when radio waves are used to transmit data packets without the use of wires

   • slower but removes need for cabling

6. Encryption is the method of scrambling data with a key code

   • E.G. WIFI passwords
   • 'SSL' (Secure Socket Layer)
     • starts with HTTPS://
     • padlocks

7. Ethernet is a number of computer systems that make a Local Area Network (LAN)

8. Ethernet benefits:

   • stable connnection
     • reduced chance of being hacked
       • more secure
         • faster traffic speed
           • good quality signal

9. WIFI Benefits

   • cheap to set up
     • more vunerable to hacking
       • walls/obstructions reduce signal quality
         • can connect multiple devices
           • interference can occur
             • less disruption (no wires)
               • no specific location
                 • signal may not be received
                   • connection may not be stable
                     • slower transfer speeds

10. protocols:

    • HTTPS
      • Hyper Text Transfer Protocol Secure
    • HTTP
      • Hyper Text Transfer Protocol
    • TCP/IP
      • Transmission control Protocol/Internet Protocol
    • POP
      • Post Office Protocol
    • FTP
      • File Transfer Protocol
    • SMTP
      • Simple Mail Transfer Protocol
    • IMAP
      • Internet Message Access Protocol

11. OSI Model:

12. Appliciation

    • Presentation
      • Session
        • transport
          • Network
            • Data-link
              • Physical

13. layers:

14. IP address=A unique set of numbers that identify a computer network

15. Peer to Peer= when a computing system used to shared data to other servers

16. MAC address- is a unique address used to identify a computer system

    • does not change

17. TCI/IP

    • used to transmit data between different networks

18. layers ensure different types of hardware and software are able to communicate

19. packet switching is when data is split up and sent to a device and reassembled so it is in order. If not packet is resent and if done a confirmation message is recieved