ITPEC IP October 2018 Question 40

A virtual network set up over a public network and used like a dedicated network — that is a VPN (Virtual Private Network).

A dedicated (leased) line is private but costly. A VPN 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, as if it were their own line. An Internet VPN runs over the Internet; an IP-VPN runs over a carrier's closed network. VPNs link branch offices and let staff reach the internal network from outside.

Answer (c)

Why not others:

• •(a) — devices on a wireless network communicating directly without an access point are in ad hoc mode
• •(b) — a network within a limited area such as an office or building is a LAN
• •(d) — a network where a PC is checked for security, such as patches and virus definitions, before it joins the internal network is a quarantine network

Key rule: A VPN gives private use of a shared network through tunnelling and encryption, replacing a dedicated line at lower cost.

Networks · AI-written, may contain errors