Which is a common secure remote access method used in defense networks?

• A. VPN with multi-factor authentication (MFA).
• B. Public Wi-Fi access with no security.
• C. RDP over an untrusted channel without authentication.
• D. SMTP-based remote access.

Answer: (A)

Secure remote access in defense networks hinges on protecting data in transit and verifying who is connecting. A VPN provides an encrypted tunnel over public or untrusted networks, so sensitive commands and information stay confidential and untampered as they travel to and from the defense network. Pairing that with multi-factor authentication adds a second layer of identity verification, making it far harder for an attacker to gain access even if a password is compromised. This combination supports strong access control, better auditing, and reduced risk of credential theft—precisely what defense environments require for remote connections.

Public Wi‑Fi with no security exposes everything to interception and tampering. RDP over an untrusted channel without authentication leaves sessions open to interception and misuse. SMTP-based remote access isn’t designed for secure remote administration and lacks proper authentication and encryption.