Network Topologies ,Protocols and Layers 1.5

Network Topologies ,Protocols and Layers 1.5

1. What is a network?

   • A computer network is a number of computers linked together so that they are able to share hardware, software and data.
   • Networks are everywhere. In schools, at homes, in businesses and in hospitals.

2. Key words:

   • Topologies- The arrangement of various elements of a communication network.
     • Mesh Network- A local network topology in which the infrastructure nodes connect o as many other nodes as possible.
       • Star Network- The most common computer network topology. It consists of 1 central hub which acts as a conduit to transmit messages.
       • Wi-Fi - A facility which allows devies to connect to the internet and communicate wirelessly
         • Encryption- The process of converting information or data into a code in order to prevent unauthorized access
           • Ethernet- A system for connecting a number of computer systems to form a local area network, with protocols to control the passing of information and to avoid simultaneous transmission by two or more systems.

3. Ethernet and Wi-Fi benefits

   • Stable connection
     • Ethernet
   • Reduced possibility of being hacked
   • More secure
   • Faster traffic speed
   • Good quality signal
   • Wi-Fi
     • Cheap set up costs
     • Connect to multiple devices
     • No wires need to be installed
     • Not tied down to a specific location
     • A wireless frequency that uses radio waves to transmit packets

4. POP

   • Post Office Protolcol

5. POP3

   • Post Office Protocol 3

6. Protocol: What is it?

   • A set of rules that is to be carried out by the computer

7. TCP/IP: The protocol used to transmit data between different networks

8. HTTP and HTTPS

   • Hyper text transfer protocol
   • Hyper text transfer protocol secured
     • HTTPS is more secure as it goes through an encryption process to secure data.

9. Packets

   • Packets store 3 things when transferring data
     • The senders IP address
       • The receivers IP address
         • Packets numbers