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Difficulty: MediumPlanning Virtual Private Cloud (VPC) Networks and Subnets

An enterprise architecture team is designing the network foundation in Google Cloud for a workload that will expand across multiple regions and connect to on-premises data centers via Cloud Interconnect. The team needs to establish IP address management (IPAM) guidelines for the Virtual Private Cloud (VPC) topology to avoid IP space conflicts and ensure explicit control over regional subnet creation. Which TWO architectural decisions should the team implement during the VPC network and subnet planning phase? (Select TWO.)

  1. Create the Virtual Private Cloud (VPC) network in Custom mode rather than Auto mode.Answer
  2. Allocate non-overlapping primary IPv4 CIDR blocks across all GCP subnets and connected on-premises networks.Answer
  3. C
    Create the Virtual Private Cloud (VPC) network in Auto mode to automatically provision pre-configured /20 subnets in every GCP region.
  4. D
    Assign identical primary IPv4 CIDR ranges to subnets located in different regions within the same VPC network to conserve private IP address space.

Answer

The team should create the VPC network in Custom mode and allocate non-overlapping primary IPv4 CIDR blocks across all GCP subnets and connected networks.
Creating the VPC network in Custom mode gives network administrators full control to define subnets only in chosen regions using custom IPv4 ranges. Allocating non-overlapping primary IPv4 CIDR blocks across all cloud subnets and on-premises environments ensures clean routing table generation and avoids IP collision issues over Cloud Interconnect.

Step-by-Step Solution

1
Evaluate VPC creation mode requirements for enterprise hybrid connectivity.
Auto mode creates default subnets in all regions using predictable IP blocks (10.128.0.0/9), creating a high risk of IP overlap with existing enterprise networks. Custom mode provides complete control to define only necessary subnets with designated CIDR ranges.
Enterprise hybrid architectures demand custom subnet boundary planning to prevent address collisions across VPN and Interconnect tunnels.
2
Determine primary IPv4 address space allocation rules across regions and hybrid connections.
Primary CIDR ranges within a single VPC network must be distinct per subnet and must not overlap with remote networks linked via hybrid connectivity.
Overlapping CIDR blocks block route propagation and break bi-directional packet routing between GCP and external endpoints.

Key Concept

Planning Custom Mode VPC Networks and Non-Overlapping Subnet Addressing
Estimated Time:1m 30s
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Topics

Planning Virtual Private Cloud (VPC) Networks and Subnets

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