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Master AWS Certified Solutions Architect Associate SAA-C03 Exam

Domain Name System

Explore the fundamentals of the Domain Name System, including IP addresses, DNS hierarchy, zones, and records. Understand how Amazon Route 53 manages DNS resolution, domain registration, routing policies, and health checks to ensure efficient access to web resources.

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Every device connected to the internet has its unique IP addressIP address is short for Internet Protocol address. It is a unique numerical label assigned to each device connected to a computer network. IP addresses can be either IPv4 (32-bit) or IPv6 (128-bit)., enabling communication with it. When we browse the internet, we access web applications hosted on servers, each identified by a distinct IP address. For instance, consider the case of educative.io. If we assume that the content of educative.io is stored on a server with the IP address 104.18.2.119., then educative.io is a domain name that directs users to this server. We can access the same content using the educative.io domain name or the server’s IP address.

Users accessing educative.io
Users accessing educative.io

The Domain Name System (DNS) is a hierarchical decentralized naming system that translates human-readable domain names, such as educative.io, into IP addresses. The DNS organizes domain names into a hierarchical tree-like structure:

  • At the top are root domain servers, the highest authority in DNS.

  • Below are ...