DNS resolution is the process of translating domain names into IP addresses. When a user types a domain name into a web browser, the browser sends a request to a DNS resolver, which is responsible for initiating and sequencing the queries that ultimately lead to a full resolution of the resource sought. The DNS resolver then queries one of the root servers to start the resolution process. The root servers do not answer directly but respond with a referral to more authoritative servers, such as the org servers. The resolver now queries the servers referred to, and iteratively repeats this process until it receives an authoritative answer.
DNS resolution involves converting a hostname (such as www.example.com) into a computer-friendly IP address (such as 192.168.1.1) . The process can use a combination of query methods, such as recursive, non-recursive, and iterative. DNS resolution issues are often the root cause of network outages, and a misconfiguration in a single DNS server can lead to cascading failures for all of the services that communicate with it.
DNS resolution is important because it allows users to easily search for and access websites or other publicly available services, and it facilitates communication between hosts on a local network. The DNS resolution process needs to be performed quickly to ensure that users can access websites without delay.
