Which technology can provide secure access to users?

• A. NAT
• B. Firewall
• C. VPN (Virtual Private Networks) can be used to provide secure access.
• D. IDS

Answer: (C)

Providing secure access to users means creating an encrypted, authenticated channel between the user and the network. VPNs do exactly that: they establish a secure tunnel over an untrusted network, authenticate both ends, and encrypt traffic so eavesdroppers can’t read it. This lets remote users connect to internal resources as if they were on the local network, with confidentiality and integrity preserved.

NAT is about translating IP addresses and can obscure internal topology, but it doesn’t protect data in transit or verify user identity. A firewall controls which traffic is allowed based on rules, but it doesn’t by itself provide the encrypted tunnel or remote access authentication. An IDS monitors for suspicious activity and alerts on threats; it doesn’t provide secure access or encryption.

So the technology that best provides secure access for users is VPN.