In a cloud environment, which control mechanism is used to regulate both inbound and outbound traffic between virtual private clouds (VPCs)?

The appropriate control mechanism for regulating both inbound and outbound traffic between virtual private clouds (VPCs) is NAC lists. Network Access Control (NAC) lists are essential in cloud environments for defining and enforcing security policies regarding which entities are allowed to communicate over the network. They serve as a gatekeeper to ensure that only authorized traffic flows between VPCs, thus enhancing the overall security posture.

NAC lists can dynamically adapt and manage network access based on various criteria, such as source and destination IP addresses, port numbers, and protocols. This functionality is critical in cloud architectures where multiple VPCs need to interoperate securely while minimizing risks associated with unauthorized access or data breaches.

In contrast, other options, while useful in certain functions within a network architecture, do not specifically address the regulation of traffic between VPCs in a cloud environment. Screened subnets primarily focus on creating a separate layer of security between networks rather than directly managing traffic between VPCs. A jump box serves as an intermediary host for accessing servers in a more secure part of the network, but it is not a traffic control mechanism. VNET, while important for creating virtual networks, does not inherently regulate traffic between multiple clouds or VPCs. Therefore, NAC lists