How can you organize a connection to the internal network through the demilitarized zone (DMZ)?

Connecting to an internal network through a demilitarized zone (DMZ) is usually organized using a multi-layer security architecture, where the DMZ serves as a buffer zone between the external network (e.g., the internet) and the internal network.

Main approaches:

• Proxy servers and gateways: Servers are placed in the DMZ to accept external connections and forward requests to the internal network through strictly controlled channels.
• VPN with two-factor authentication: The user first connects to a VPN server in the DMZ, and after authentication, gains access to internal resources.
• Bastion host: A special server in the DMZ through which access to internal systems is carried out, often with command and protocol restrictions.
• Firewalls: Rules are configured to allow traffic from the DMZ to the internal network only on certain ports and protocols.

Example: a user connects to a VPN server in the DMZ, and after successful authentication, the VPN tunnel securely transmits data to the internal network, while direct access from the external network to internal resources is prohibited.