Unit 1.5 Network Topologies, protocol and layers V2

Unit 1.5 Network Topologies, protocol and layers V2

1. Star Networks

   • Advantages
     • Fewer data collisions
     • East to add additional devices
     • Very Reliable
   • Disadvanages
     • Higher level of dependence on one single, central device

2. Protocol

   • Set of rules
   • POP (Post office Protocol)
   • HTTP and HTTPS
     • HTTP uses encryption
     • HTTPS transmits data through the internet
     • HTTP used by web browsers to communicate with web servers
   • IMAP is used to recieve emails
   • SMTP used to send emails
   • Uses layers for network communication to be standardised

3. Packet switching calculates the checksum

4. IP and MAC Addresses

   • IP addresses may change
   • MAC Addresses stay the same

5. Routers

   • B Series
     • Faster data transmittion