What challenge is faced when extending legacy network and security to the public cloud?

When extending legacy network and security to the public cloud, creating Virtual Private Clouds (VPCs) and Virtual Networks (VNETs) does indeed introduce additional complexity and overhead. Legacy systems are typically designed for on-premises environments, where configurations and resources are more straightforward. When transitioning to the cloud, organizations need to create these virtualized environments to segment resources, enhance security, and ensure seamless connectivity.

The overhead comes from the need to manage and configure these environments effectively. This involves not only the initial setup but also ongoing management, monitoring, and potential adjustments as the organization’s needs evolve. This complexity can slow down the implementation of cloud solutions and introduce challenges in integration with the existing infrastructure, making it a significant consideration for businesses aiming to extend their services seamlessly to the cloud.

While configuring secure firewalls, maintaining service level agreements, and reducing network traffic are all relevant to cloud architecture and security, they don't directly encapsulate the specific challenge of overhead created by the setup of VPCs and VNETs. Thus, the focus on the complexity and management required for these cloud-specific configurations is rightly highlighted as a major challenge.