What is DNS in the cloud and why is it important for service exposure?

• A. A firewall management tool
• B. A data routing protocol
• C. A storage service for raw data
• D. Domain Name System translates domain names to IPs; essential for routing, load balancing, and service discovery

Answer: (D)

DNS translates human-friendly domain names into IP addresses, which is what lets clients reach services in the cloud. When you expose a service, you map a domain like app.example.com to the IP address of a load balancer or gateway in your cloud environment. That mapping allows the client to resolve the name to a reachable endpoint and have requests routed to the correct resource. DNS records types (A, AAAA, CNAME, etc.) enable flexible routing to different endpoints in different environments or regions, supporting load balancing and smooth traffic distribution during deployments. DNS can also work with health checks and failover so traffic shifts away from unhealthy endpoints, improving availability. In microservices, DNS-based service discovery helps services find each other by name without hard-coding IPs, keeping clients decoupled from concrete infrastructure. It also pairs with CDNs and edge caches to bring content closer to users. This role is distinct from firewall tools, data routing protocols, or storage services—the DNS system provides naming and lookup to steer traffic to the right exposed service.