DNSjärjestelmän

DNSjärjestelmään is the Finnish term for the Domain Name System (DNS). This system is a hierarchical and decentralized naming system for computers, services, or other resources connected to the Internet or a private network. It translates human-readable domain names, such as example.com, into the numerical IP addresses used by computers to locate each other. Without DNS, users would have to remember long strings of numbers to access websites and other internet resources.

The DNS operates as a distributed database. When a user types a domain name into their web browser, their computer sends a query to a DNS resolver. This resolver then recursively queries a series of DNS servers, starting with root servers, then top-level domain (TLD) servers, and finally authoritative name servers, to find the corresponding IP address. Once found, the IP address is returned to the user's computer, allowing the browser to connect to the correct server.

Key components of the DNS include domain names, which are organized hierarchically with the top-level domain (like .com or .org) at the highest level, followed by second-level domains and subdomains. DNS records store information about domains, such as IP addresses (A records), mail servers (MX records), and aliases (CNAME records). The system's distributed nature makes it resilient to failures, as information is spread across many servers worldwide. DNSjärjestelmään is fundamental to the functioning of the internet as we know it.