How can you secure intra-VPC traffic in Google Cloud?

Securing intra-VPC traffic in Google Cloud can be effectively achieved by using firewall rules and VPC Service Controls. Firewall rules allow you to create customizable access controls for your virtual machine (VM) instances. This means you can specify which traffic should be permitted or denied based on factors such as IP addresses, protocols, and ports, providing granular control over the flow of data within your VPC.

VPC Service Controls further enhance security by helping you define a security perimeter around your Google Cloud resources. This allows you to protect sensitive data from being exfiltrated or accessed outside of specified parameters, ensuring that only authorized traffic can interact with your critical services.

In contrast, approaches like allowing unrestricted access would compromise security instead of enhancing it, while disabling all communication within the VPC would negate the functionality of your services. Implementing only DNS security measures, while beneficial for preventing certain types of attacks, does not directly secure the traffic flowing between resources within your VPC. Therefore, using firewall rules and VPC Service Controls presents a comprehensive strategy for securing intra-VPC traffic effectively.