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ICT: Internet, IPv4: For 4 billion addresses.
IPv6: For 340 undecillion…
ICT: Internet
Internet:
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- Result of Arpanet ( Advance Research Project Agency Network)
- 2 Types of networks: Centralized and Distributed.
- Made up of an incredibly large number of independently operated networks.
- Tangible system made up to move information
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IP addresses and DNS
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- Addressing system: most important protocol for the internet.
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- IP addresses: Define region/country, then networks, subnetworks and device.
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Packets, Routing & Reliability
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Router; Traffic Managers. Controls the path of the packets. It chooses the cheapest (in time, politics and relationships), path for each piece of data.
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TCP: Transmission Control Protocol. Manages sending and receiving of all data and packets.
More routers = More reliable
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Encryption & Public Keys
- Make use of the exchange of private info.
- Encryption: Scrambling or changing a message to hide it.
- Decryption: UnScrambling or changing a message to make it readable.
- Asymmetric Encryption: To protect messages. Uses different keys for encryption and decryption.
Cybersecurity & Crime
Viruses: Executable program that gets installed- Harms the user and computer. This can control your programs, steal and delete info.
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- IPv4: For 4 billion addresses.
IPv6: For 340 undecillion adresses.