Your organization has strict network isolation requirements. Which GCP feature enables secure communication between isolated networks?

Correct answer: Cloud VPN

Option A is correct because Cloud VPN establishes encrypted IPsec tunnels between GCP Virtual Private Cloud networks and other networks, enabling secure communication across isolated environments while satisfying strict network isolation requirements. Option B is wrong because public IP addresses expose resources to the open internet, which directly violates strict network isolation requirements and introduces unnecessary attack surface. Option C is wrong because Cloud NAT enables private instances to reach the internet for outbound traffic but does not create secure communication channels between two isolated networks. Option D is wrong because Cloud Endpoints is an API management platform for deploying and monitoring APIs, not a network isolation or secure inter-network connectivity solution.