Resolving IP Overlap with Private NAT in Network Connectivity Center
Short answer
D Configure a subnet of purpose PRIVATE_NAT and use Private NAT for the Network Connectivity Center spokes to resolve IP overlaps between on-premises and Google Cloud.
Question
Key Takeaways
IP overlap requires Private NAT with NCC spokes, not standard routing or public-facing load balancers.
Learn how to connect overlapping on-premises and Google Cloud networks using Private NAT with Network Connectivity Center spokes.
Common mistake: Choosing Hybrid NAT or load balancer options, which either use incorrect terminology or fail to address the private IP translation requirement for NCC.
Expert Analysis
The core challenge is IP address overlap between on-premises networks and Google Cloud VPCs while maintaining direct connectivity. Standard routing cannot resolve overlapping CIDRs because the cloud router would not know which destination to forward traffic to.
To solve this, Network Address Translation (NAT) is required to translate the source or destination IPs so they become unique within the scope of the connection. Google Cloud offers two primary NAT solutions: Cloud NAT for internet egress and Private NAT for internal/private network connections.
Private NAT is specifically designed for use with Network Connectivity Center (NCC). It allows you to create a NAT gateway that translates IP addresses between NCC spokes (VPCs) and connected networks (like on-premises sites). This enables VMs in the VPC to communicate with on-premises hosts using their original on-premises IPs, provided the translation is handled correctly by the Private NAT gateway.
The specific configuration involves creating a subnet with the purpose PRIVATE_NAT. This subnet is used by the Private NAT gateway associated with the NCC hub/spoke architecture. When traffic flows from the VPC to the on-premises network, the Private NAT gateway translates the source IP (or destination, depending on direction) to avoid conflicts. The option 'D' correctly identifies both the subnet purpose (PRIVATE_NAT) and the service (Private NAT for NCC spokes).
Option E mentions 'Hybrid NAT', which is not a standard Google Cloud product name in this context; the correct terminology is Private NAT. Options A and C involve load balancers with REGIONAL_MANAGED_PROXY subnets, which are used for TCP proxy load balancing but do not solve the fundamental IP overlap issue for general direct VM-to-host connectivity via NCC.
Exam Strategy
When facing IP overlap scenarios in hybrid connectivity questions, immediately rule out standard routing. Look for keywords like 'overlap' and 'direct connectivity'. In Google Cloud's NCC context, associate 'overlap resolution' with 'Private NAT' and 'PRIVATE_NAT' subnets, rather than Cloud NAT or Load Balancers unless egress/proxying is explicitly requested.
Frequently Asked Questions
What is Private NAT in Google Cloud?
Can I use Cloud NAT for NCC spoke connections?
Community Votes
67% of anonymous learners picked answer E. Votes are pick records left by other test-takers — they are not the verified answer.
Discussion 3 contributions
Compiled from public community threads and reader submissions, lightly edited for clarity. Handles and vote tallies are shown as recorded, and comments reflect the views of individual contributors.
From public community threads 3
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glb2 👍 2 Answered EE is correct.
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Martrin 👍 1 Answered DThe correct answer is D. According to google documentation: ""Private NAT lets you create a Private NAT gateway that works in conjunction with Network Connectivity Center spokes to perform network address translation (NAT) between the following networks: Virtual Private Cloud (VPC) networks. In this scenario, the VPC networks that you want to connect are attached to a NCC hub as VPC spokes. VPC networks and networks outside of Google Cloud. In this scenario, one or more VPC networks are attached to a NCC hub as VPC spokes and connected to your on-premises or other cloud provider networks through hybrid spokes."" https://docs.cloud.google.com/nat/docs/about-private-nat-for-ncc
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TMe392 👍 1 Answered ENCC hybrid NAT refers to a feature within Google Cloud's Network Connectivity Center (NCC) that enables private Network Address Translation (NAT) between Google Cloud VPC networks and on-premises or other cloud networks, especially when IP address ranges overlap
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