Domain Name System Protocol (DNS)
The Domain Name System (DNS) is a hierarchical naming system for computers, services, and other resources connected to the Internet or other networks. It associates human-readable names with the numerical addresses (IP addresses) used by computers to identify each other.
How DNS Works
When you type a domain name into your web browser, such as www.tumkurlab.com, your computer sends a request to a DNS server. The DNS server then looks up the domain name in its database and returns the corresponding IP address. Your computer then uses the IP address to connect to the website.
DNS Components
The DNS system consists of the following components:
- Name servers: Name servers are computers that store DNS records. DNS records contain the mapping between domain names and IP addresses.
- Resolvers: Resolvers are computers that query name servers to resolve domain names to IP addresses.
- Root servers: Root servers are the top-level name servers in the DNS system. They store the mapping between top-level domains (TLDs) and TLD servers.
DNS Records
DNS records are the data that is stored in DNS databases. They contain the mapping between domain names and IP addresses. The most common types of DNS records are:
- A records: A records map domain names to IPv4 addresses.
- AAAA records: AAAA records map domain names to IPv6 addresses.
- CNAME records: CNAME records map domain names to other domain names.
- MX records: MX records map domain names to mail servers.
The Future of DNS
The DNS system is constantly evolving to meet the needs of users. In the future, DNS is likely to be used to support new applications and services, such as the Internet of Things (IoT).
Conclusion
The DNS protocol is an essential part of the Internet. It allows users to easily access websites by using domain names instead of IP addresses. The DNS system is constantly evolving to meet the needs of users.