Unit 1.5 V2 Network Topologies

Unit 1.5 V2 Network Topologies

1. Network Types

   • Mesh Network
     • Some or all workstations are connected to each other
     • Most are usually connected to the node they exchange the most data with
   • Star Network
     • Each device is connected by an individual cable directly to the server
     • These tend to be more reliable and so are used in schools and offices

2. Encryption

   • A method of scrambling data with a key code which makes no sense
   • In order to read it you must have the key
   • We use it with wifi so if data is intercepted it has no meaning
   • Request HTTPS, Certificate is sent, Client creates session key, Session Key sent to server, Session Key decrypted by Private Key, Session encrypted with Session Key.

3. Wifi

   • Wireless Frequency
   • Radio Waves transmit data packets without wires
   • It has a cheap set up
   • It can lose signal through obstructions
   • Can connect multiple devices easily but more slowly
   • Can be hacked more easily
   • The user isn't tied to a specific location

4. Ethernet

   • Stable Connection
   • Less likely to be hacked
   • Faster traffic speed
   • Generally gives out a good quality signal

5. Protocols

   • IP = Internet Protocol, Normally referred to in IP addresses
   • HTTP = Hyper Text Transfer Protocol
   • HTTPS = Hyper Text Transfer Protocol Secure, encrypted sites
   • FTP = File Transfer Protocol
   • TCP = Transmission Control Protocol, uses a set of rules to exchange messages with other internet points at the information packet level.
   • IMAP = Used to retrieve emails
   • SMTP = Used to send emails
   • POP = Post Office Protocol
   • POP3 = POP version 3, used to retrieve emails

6. Layers

   • Layers are used so troubleshooting is easier as we can locate the issue
   • If we need to edit the protocol, we can edit the one specific layer instead of the protocol as a whole.
   • Any device from any platform can use the same communication.