1.5 Network Topologies, Protocols and Layers

1.5 Network Topologies, Protocols and Layers

1. Key words

   • WIFI
   • Topology
   • Ethernet
   • Mesh network
   • Star network
   • Encryption

2. Mesh network

   • Where some or all of the work stations or other devices are connect directly to each other.Most are usually connected to the node that they exchange the most data with.

3. Star network

   • In a star network, each device is connected 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 the topologies.

4. Ethernet Benefits

   • Stable connection
   • Reduced possibility to be hacked
   • More secure
   • Faster traffic speed
   • Generally will have a good quality signal

5. WiFi Benefits

   • Cheap set-up costs
   • More vulnerable to hacking
   • the signal quality will reduce through walls or obstructions.
   • Interference can occur
   • Less disruption o the building due to no wires being installed.
   • Tend to have slow transfer speeds
   • The connection is not as stable as wired networks and can 'drop off'.
   • May not be able to receive a signal
   • WiFi
     • WiFi is Wireless Frequency
     • Radio waves are used to transmit data packets with out the need for wires
     • This method is slower and more vulnerable to attack but it removes the need for cabling and networks
     • This means that it can be set up in remote locations such as in vehicles, in parks or on planes etc.

6. Encryption

   • Encryption is a method of scrambling data with a key code which makes no sense.
   • On an open or public WiFi network anyone can join and sniff out packets of data from other users.
   • Therefore encryption is used. if intercepted the data will have no meaning
   • In order to read the data the user is required to decrypt the data using the key

7. IP Address

   • A unique string of numbers separated by full stops that identifies each computer using the internet protocol to communicate over a network
   • They are similar to as a postcode that is used to identify a house in a country on a street.