Unit 1.5 Network Topologies, protocols and layers V2

Unit 1.5 Network Topologies, protocols and layers V2

1. Network

   • Star Network
     • Each device is connected by an individual cable directly to the server
   • Mesh Network
     • When workstations or other devices are connected directly to each of other.
   • Networked computers can share hardware, software and data.
   • Are all around you, school, at home in businesses and hospitals.

2. Wifi

   • Wireless Frequency

3. Ethernet

   • Generally will have good signal
   • Faster Traffic Speed
   • Reduced possibility to be hacked
   • Stable connect

4. Packets

   • A packet is the unit data that is routed between an origin and a destination on the Internet or any other packet-switched network
     • It is data put in individual packets
       • The packet is sent and read
         • Calculate checksum
           • Once received it checks for missing packets
             • If one is missing then it will send an error message
               • Then it will reassemble and send the other packet
                 • Then it will receive the data and there will be a confirmation message
     • Packets obtain
       • Packet number
       • Payload
       • The network source
       • The network destination

5. Encryption

6. Protocols

   • POP
     • Post Office Protocol
   • HTTP = Hyper Text Transfer Protocol
   • HTTPS = Hyper Text Transfer Protocol Secure
   • IP
     • Internet Protocol
       • Also known as IP address
   • IMAP
     • Used to retrieve emails