Google Professional Cloud Network Engineer Question 539
Select 2Google Cloud PlatformYour organization is currently using an on-premises DNS solution and plans to migrate to Google Cloud DNS for better scalability and integration with Google Cloud services. During the migration, you need to ensure uninterrupted DNS resolution for existing services while transitioning to Cloud DNS. Which of the following steps should you take to achieve this?
- A
Export the DNS records from the on-premises DNS solution and import them into a Cloud DNS managed zone.
- B
Configure Cloud DNS as a forwarding zone in the on-premises DNS server to resolve queries for specific domains.
- C
Update the TTL (Time-to-Live) values of existing DNS records to a lower value before the migration.
- D
Immediately update the domain registrar to point to Cloud DNS name servers after creating the managed zone.
- E
Use policy-based routing to direct DNS queries to both on-premises and Cloud DNS simultaneously.
Show answer and explanation
Correct answers: A, C
Explanation
To ensure a smooth migration to Cloud DNS without downtime, you need to replicate the DNS records in the Cloud DNS managed zone and reduce the TTL values to allow for faster propagation of DNS changes. Forwarding zones and policy-based routing are not relevant to the migration scenario, and updating the domain registrar should only occur after the Cloud DNS setup has been fully validated.
- A. Correct.
Exporting the DNS records and importing them into a Cloud DNS managed zone is essential to replicate the DNS configuration and ensure proper resolution in the cloud environment.
- B. Incorrect.
Configuring Cloud DNS as a forwarding zone is not required for migration; instead, it is used to forward queries from one DNS server to another, which is unrelated to this scenario.
- C. Correct.
Lowering the TTL values ensures that clients cache the DNS records for a shorter duration, which minimizes downtime during the migration and allows for quicker propagation of changes.
- D. Incorrect.
Immediately updating the domain registrar to point to Cloud DNS can cause resolution issues if the managed zone has not been properly configured and tested first.
- E. Incorrect.
Using policy-based routing for DNS is not a recommended approach for DNS migration as it adds unnecessary complexity without addressing the migration requirements.