Ian is devising a secure public-facing network for his cloud datacenter and aims to safeguard his application servers while enabling customer access to his web servers. Which design concept should he utilize to establish this type of secure environment?

The concept of Demilitarized Zones (DMZs) continues to be relevant when designing cloud environments, although the specific technical implementation can vary depending on the cloud provider's secure web services, load-balancing capabilities, or other features. While proxy servers are handy for managing, filtering, and routing traffic, they do not offer the complete segmentation that Ian requires. A Virtual Private Cloud (VPC) is a virtual datacenter that can usually accommodate his infrastructure, but it does not specifically address these requirements.