300-420 Question 239
Single answerA global enterprise is designing its network to support a hybrid cloud solution. One of the priorities is ensuring seamless DNS services across on-premises and cloud environments for application availability and scalability. Which network service design consideration is MOST important to ensure consistent and responsive DNS resolution in this hybrid environment?
- A
Deploying a centralized DNS infrastructure within the on-premises data center
- B
Implementing split-horizon DNS for internal and external domain resolution
- C
Enabling DNSSEC to secure DNS query responses
- D
Using Anycast technology for DNS servers across multiple regions
Show answer and explanation
Correct answer: B
Explanation
Split-horizon DNS is critical for hybrid cloud environments as it ensures that internal DNS queries are resolved using internal DNS servers while external queries are resolved using public DNS servers. This design approach provides security, scalability, and consistent resolution for applications deployed both on-premises and in the cloud.
- A. Incorrect.
A centralized DNS infrastructure can introduce latency and a single point of failure, especially in a hybrid cloud environment requiring global availability.
- B. Correct.
Split-horizon DNS ensures that internal and external resources are resolved differently based on the source of the request, which is critical for hybrid cloud environments to avoid exposing internal DNS information while maintaining external availability.
- C. Incorrect.
While DNSSEC improves security by validating DNS responses, it does not address seamless or consistent resolution for hybrid cloud environments.
- D. Incorrect.
Anycast improves DNS performance and redundancy by distributing DNS servers globally, but it does not specifically address the need for internal and external domain resolution across hybrid environments.