ITPEC IP October 2023 Question 30

Highly secure communications by authentication and encryption — a VPN makes a public network such as the Internet safe to use like a private line.

Traffic between the PC outside and the workplace network crosses the Internet, where it could be read or altered. A remote-access VPN first authenticates the user or device, then encrypts every packet and carries it through a tunnel to the VPN gateway at the workplace. To the PC it looks as if it were connected directly to the internal network, and an eavesdropper on the way sees only encrypted data.

Answer (d)

Why not others:

• •(a) — providing several Internet lines to raise availability is line redundancy (multihoming), not a VPN
• •(b) — guaranteeing a maximum delay by controlling transmission timing is QoS control; an Internet VPN runs over best-effort lines and guarantees no delay
• •(c) — compression reduces data volume but guarantees no minimum bandwidth; a bandwidth guarantee comes from the line contract or QoS, not from a VPN

Key rule: A VPN secures communication over a shared network through authentication, encryption and tunnelling; availability, delay and bandwidth depend on the lines underneath.

Security · AI-written, may contain errors