From Computer Science Wiki

A virtual private network (VPN) extends a private network across a public network, and enables users to send and receive data across shared or public networks as if their computing devices were directly connected to the private network. Applications running across the VPN may therefore benefit from the functionality, security, and management of the private network.[2]

Required technologies[edit]

Vpn tunnel.gif
I thank the Dartford Grammar School for this material[3]

  • A LAN that is connected to the internet.
  • One computer outside of the LAN that is also connected to the internet.
  • VPN client and server running on the lone machine and the original LAN
  • Internet connection

In addition, you also need to understand VPN requires:

  • encryption (the process of encoding a message or information in such a way that only authorized parties can access it[4])
  • tunneling (allows a network user to access or provide a network service that the underlying network does not support or provide directly[5])

In addition, you also need to know VPN encryption requires:

  • SSL 3.0 (Secure socket layer 3)
  • TLS (with encryption) (Transport Layer Security)
  • IPsec with encryption

A video explaining VPN basics[edit]

Evaluate the use of a VPN[edit]

Possible Advantages[edit]

  • VPNs can provide increased privacy while online
  • VPNs can provide enhanced security while online
  • VPNs can provide flexible work hours
  • VPNs can provide flexible work options, which in turn can be cost-effective

Possible Disadvantages[edit]

  • VPNs could promote isolation
  • VPNs could promote distractions
  • VPNs could make developing professional relationships more difficult

A video describing some of the benefits of a VPN[edit]


These standards are used from the IB Computer Science Subject Guide[6]

  • Identify the technologies required to provide a VPN.
  • Evaluate the use of a VPN.


  1. http://www.flaticon.com/
  2. https://en.wikipedia.org/wiki/Virtual_private_network
  3. http://ib.compscihub.net/wp-content/uploads/2015/04/3.1.4.pdf
  4. https://en.wikipedia.org/wiki/Encryption
  5. https://en.wikipedia.org/wiki/Tunneling_protocol
  6. IB Diploma Programme Computer science guide (first examinations 2014). Cardiff, Wales, United Kingdom: International Baccalaureate Organization. January 2012.

a group or system of interconnected people or things.

a group or system of interconnected people or things.

a group or system of interconnected people or things.

Assess the implications and limitations; make judgments about the ideas, works, solutions or methods in relation to selected criteria.

Provide an answer from a number of possibilities. Recognize and state briefly a distinguishing fact or feature.