communication and the internet

communication and the internet

1. networks

   • computers that are connected to each other
   • WAN
     • wide area network for example the internet
   • LAN
     • local area network within the same building
     • advantages: easier to secure than a WAN
   • client-server
     • Advantages: files are stored centrally so are easier to manage. other resources such as printers are easier to manage. licences are stored centrally
     • Disadvantages: failure of the server can potentially take down all acess. a single server can only serve a finite amount of people
   • peer-peer
     • Advantages: doesn't require specialist help to install

2. connections media types

   • NIC(network interface card)
   • wired(Ethernet, copper cable, fiber optic)(
   • wireless(wifi, 4G)

3. network devices

   • switch
   • device
   • router
   • Ethernet cable
   • NIC
   • WAP
   • cellular device
   • 4G/3G tower

4. Protocols

   • HTTP: hypertext transfer protocol. the set of rules governing how the hypertext is moved around the internet from device to device
   • FTP: file transfer protocol. how files are moved from one computer to another across the internet
   • TCP/IP protocols that often work together. transfer control protocol and internet protocol. their collective role is to break up data into packets each of which is a chunk of data that knows where it has been sent from and where it is delivered to
   • Ethernet governs how data is formatted for transmission in a LAN
   • Wi-Fi controls how data is transmitted across a LAN wirelessly
   • HTTPS: encrypts data sent across the internet
   • POP3
   • SMPT
   • FTP:
   • IMAP: multiple devices access the same email account

5. TCP / IP stack

   • a series of protocols that work together

6. network topologies

   • Ring
     • advantages:
     • disadvantages:
   • Bus
     • advantages:
     • disadvantages:
   • Star
     • advantages:
     • disadvanges:
   • Mesh
     • advantages:
     • disadvantage:

7. Network security

   • cyber attacks
   • social engineering(phishing, shouldersurfing)
     • don't give out info
   • unpatched software
     • keep it up to date
   • USB devices
   • Eavesdropping
     • us enecryption software
   • The cloud
   • protect the server phisically

Bilder und Dateien der Mindmap