ITPEC IP April 2020 Question 40

Topic: NetworksAlso asked in April 2024 and April 2026

Among the descriptions from A through C, which of the following is the list that contains all appropriate features of VPN?

ADevices can communicate with each other by using a VPN wirelessly without passing through any access point.BA VPN uses a public network, etc., but it can be used like a private network of one’s own company.CThe security status of computers can be checked by connecting them to a VPN.

Explanation

B only — a VPN runs over a public network but is used as if it were the company's own private network.

A dedicated (leased) line is private but costly. A VPN (Virtual Private Network) carries the traffic over a public network instead, the Internet or a carrier's shared network, and uses tunnelling, authentication and encryption so that only the organisation's sites and users can use the connection. That is exactly B.

  • •A: devices on a wireless LAN talking to each other directly, without an access point, is ad hoc mode, not a VPN
  • •C: connecting a computer to a separate network so its security status (patches, virus definitions) is checked before it joins the internal network is a quarantine network

Answer (c)

Why not others:

  • •(a) A and (b) A, C — include A, which describes ad hoc wireless communication, and leave out B
  • •(d) C — describes a quarantine network and leaves out B, the one true VPN feature

Key rule: A VPN gives private use of a shared network through tunnelling and encryption; ad hoc mode is direct wireless communication and a quarantine network checks PCs before they join.

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