unit 1.5 - network topologies, protocols and layers

unit 1.5 - network topologies, protocols and layers

1. A mesh network is where some or all of the workstations or other devices are directly connected to eachother. Most are usually connected to the node that they exchange the most data with.

2. A star network is, each device by an individual cable directly to the server. Star networks are usually the layout of choice in schools and offices because they tend to be the most reliable of topologies.

3. WiFi is Wireless Frequency - radio waves are used to transmit data packets without need for wires.

   • This method is slower to use and more vulnerable to attack but it removes the need for cabling and networks
     • This means that is can be set up in remote locations such as in vehicles, in parks or planes etc.

4. Encryption is a method of scrambling data with a key code which makes no sense.

   • On a open or a public WiFi network anyone can join and sniff out packet sniff data from other users
   • Therefore Encryption is used. If intercepted the data will have no meaning.

5. Key words...

   • WiFi
     • Eternet
       • Star network
         • Topoligy
       • Encryptiomn
     • Mesh network

6. A MAC address is permanent.

   • An IP Address will change and is not permanent.
     • HTTP - Used by web browsers to communicate with web servers.
       • IMAP - Used to retrieve email.

7. PoP - Post Office Protocal.

8. A static IP address never changes whereas a dynamic IP address may move and change.