Practice Test 2 | Google Cloud Certified Professional Cloud Architect | Dumps | Mock Test
How are subnetworks (VPC Networks) different than the legacy networks?
A. They’re the same, only the branding is different.
B. Each subnetwork controls the IP address range used for instances that are allocated to that subnetwork.
C. With subnetworks IP address allocation occurs at the global network level.
D. Legacy networks are the preferred way to create networks.
Correct Answer – B
Google Cloud Platform (GCP) legacy networking vs. VPC subnet:
Legacy networking
Legacy networks have a single RFC 1918 range, which you specify when you create the network. The network is global in scope and spans all cloud regions.
In a legacy network, instance IP addresses are not grouped by region or zone. One IP address can appear in one region, and the following IP address can be in a different region. Any given range of IPs can be spread across all regions, and the IP addresses of instances created within a region are not necessarily contiguous.
It is not possible to create regional subnets with a legacy network.
Legacy networking Example:
Subnets and IP ranges
Each VPC network consists of one or more useful IP range partitions called subnetworks or subnets. Each subnet is associated with a region. Networks can contain one or more subnets in any given region. Subnets are regional resources.
Each subnet must have a primary address range, which is a valid RFC 1918 CIDR block.
Subnets in the same network must use unique IP ranges. Subnets in different networks, even in the same project, can re-use the same IP address ranges.
VPC network example:
subnet3 is defined as 10.2.0.0/16, in the us-east1 region. One VM instance in the us-east1-a zone and a second instance in the us-east1-b zone, each receiving an IP addresses from its available range.
Note: Legacy networks are not recommended. Many newer GCP features are not supported in legacy networks. It is still possible to create legacy networks through the gcloud command-line tool and the REST API. It is not possible to create legacy networks using the Google Cloud Platform Console.
Reference resources
Virtual Private Cloud (VPC) Network Overview https://cloud.google.com/vpc/docs/vpc
Google Cloud Platform (GCP) legacy networking vs. VPC subnet https://cloud.google.com/vpc/docs/legacy
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