Networks

Networks

1. LAN

   • Local Area Network

2. WAN

   • Wide Area Network

3. Advantages

4. Disadvantages

5. Topologies

   • Bus
     • This is a long wire in which it s connected more computers or a sever or a printer etc
   • Ring
     • This is a conection from one in and one out connection so it removes the possibility of collisions
   • Star
     • This is where the is one single switch whch is connected to other computers or severs in a star formation
   • Mesh
     • circuit switching
       • A path across the network has to be established
       • That path is locked down and remains open for the duration of the communication
     • Packet switching
     • Pathfinding

6. Protocols

   • FTP is a protocol for transferring files between two computers
   • HTTP and HTTPS
     • HTTP is the standard protocol used for sending and requesting a HTML file from a web sver
     • HTTPS is a secure version of HTTP which encrypts the data before sending so it can't be intersepted
   • POP3 is a protocol for downloading emails from a mail sever
   • IMAP allows emails to be left on a sever and the ability to read past emails to be read by other users
   • A protocol is a set of agreed rules that both sides of a communication channel follow

7. IP addresses and DNS severs

   • IP Adresses
     • An IP a
   • DNS
     • When you type a web address into a browser, your ISP sends the domain name to its DNS sever, which returns the IP address
     • Domain name sever