Internet

Internet

1. Networks

   • A series of computers or nodes linked to each other
   • L.A.N
     • Local Area Network
   • W.A.N
     • Wide Area Network
     • E.G the internet
   • client server
     • Files are stored centrally, Easier to access printers and other devices connected,
     • If the server is damaged or shuts down all clients connected won't be able to
   • Peer to Peer
     • Isn't as expensive to set up

2. connections

   • Wired
     • Quick to send information
     • Can be easily damaged
   • Wireless
     • Easy to intercept information
     • Cheaper to set up
   • N.I.C

3. Network Devices

   • Device
     • Something that is connected to the network
   • Switch
     • Connects devices together
   • Router
     • Provides a connection to the network with a signal to connect to
   • Ethernet Cable
     • Connects to a computer
       • Quick to send information
   • NIC
     • Allows the computer to connect to the network such as a home network
   • WAP
     • Allows phones to access information over a network
   • Cellular Device
     • Mobile phone
   • 4G 3G Tower
     • Offers better coverage for messages and calls on mobile phones

4. Protocols

   • HTTP
     • Hypertext Transfer Protocol
       • Used for web pages
   • HTTPS
     • Encrypts data that is sent across the internet
   • POP3
     • Post Office Protocol Version 3
       • Accessing emails commonly used in Microsoft outlook
   • SMTP
     • Simple mail transfer
       • Used to send emails from one sever to another
   • IMAP
     • Internet Message Access Protocol
       • Allows multiple devices to access the same email account
   • FTP
     • File Transfer Protocol
       • how files are transferred from one computer to another over the internet
   • TCP/IP
     • Often work together. Transfer Control Protocol and Internet Protocol
       • Break up data into packets
   • Ethernet
     • Set of rules governs how data is formatted for transmission across a local area network
   • Wi-Fi
     • Rules control how data is transmitted wirelessey
   • TCP/IP Stack
     • A series of protocols that work together
     • Break data down into pieces and then reassemble at the receivers computer

5. Topologies

   • Star
     • One central HUB that transmits messages
   • Ring
   • Bus
     • • One linear link that all nodes are connected to
   • Mesh

6. Network Security

   • Cyberattacks
   • Social Engineering
     • Phishing
       • Could be popups or emails
     • Shoulder surfing
       • Spying on people as they type information
   • Unpatched Software
     • Software that has been patched to fix security problems but people don't update
   • Eavesdropping
     • Intercepting and taking information that has been sent
   • The Cloud
     • A server that is connected to lots of nodes containing information
       • Can get to the server physically or using another server to get to it

7. Ethical Hacking

   • Looking for ways into the system and collecting as much data or passwords as possible

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