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  2. Transmission Control Protocol - Wikipedia

    en.wikipedia.org/wiki/Transmission_Control_Protocol

    Steps 1 and 2 establish and acknowledge the sequence number for one direction (client to server). Steps 2 and 3 establish and acknowledge the sequence number for the other direction (server to client). Following the completion of these steps, both the client and server have received acknowledgments and a full-duplex communication is established.

  3. Facebook - Wikipedia

    en.wikipedia.org/wiki/Facebook

    After acquiring Onavo in 2013, Facebook used its Onavo Protect virtual private network (VPN) app to collect information on users' web traffic and app usage. This allowed Facebook to monitor its competitors' performance, and motivated Facebook to acquire WhatsApp in 2014. [247] [248] [249] Media outlets classified Onavo Protect as spyware.

  4. PlayStation 4 - Wikipedia

    en.wikipedia.org/wiki/PlayStation_4

    The PlayStation 4 (PS4) is a home video game console developed by Sony Interactive Entertainment.Announced as the successor to the PlayStation 3 in February 2013, it was launched on November 15, 2013, in North America, November 29, 2013, in Europe, South America, and Australia, and on February 22, 2014, in Japan.

  5. Digital subscriber line - Wikipedia

    en.wikipedia.org/wiki/Digital_subscriber_line

    Digital subscriber line (DSL; originally digital subscriber loop) is a family of technologies that are used to transmit digital data over telephone lines. [1] In telecommunications marketing, the term DSL is widely understood to mean asymmetric digital subscriber line (ADSL), the most commonly installed DSL technology, for Internet access.

  6. Encryption - Wikipedia

    en.wikipedia.org/wiki/Encryption

    Integrity protection mechanisms such as MACs and digital signatures must be applied to the ciphertext when it is first created, typically on the same device used to compose the message, to protect a message end-to-end along its full transmission path; otherwise, any node between the sender and the encryption agent could potentially tamper with it.

  7. Multi-factor authentication - Wikipedia

    en.wikipedia.org/wiki/Multi-factor_authentication

    Some vendors have created separate installation packages for network login, Web access credentials, and VPN connection credentials. For such products, there may be four or five different software packages to push down to the client PC in order to make use of the token or smart card. This translates to four or five packages on which version ...