- What is DNS

Question

- What is DNS

Accepted Answer

DNS stands for Domain Name System. It is a system that translates domain names into IP addresses.

DNS is like a phonebook for the internet
It helps to locate websites by translating domain names into IP addresses
DNS servers store information about domain names and their corresponding IP addresses
DNS queries are sent by web browsers to DNS servers to resolve domain names
DNS can also be used for other purposes such as email routing and network diagnostics

Accepted Answer

DNS stands for Domain Name System. It is an important component of the Internet that serves as a decentralized directory system used to translate human-friendly domain names into numerical IP (Internet Protocol) addresses that computers use to identify each other on the network. Simply put, DNS is like the Internet's phonebook, translating easy-to-remember domain names like "example" into the actual IP address of the web server hosting that website.

Here's how DNS works:

User input: When you enter a website URL into your web browser , your computer needs to find the IP address associated with that domain to connect to the web server.

DNS Query: Your computer sends a DNS query to a DNS resolver. This resolver may be provided by your Internet Service Provider (ISP) or a public DNS service such as Google DNS or OpenDNS.

Resolver Lookup: The DNS resolver first checks its local cache to see if it already knows the IP address of the requested domain. If the data is not in its cache or has expired, it moves to the next step.

Root Server: If the resolver does not have the information, it contacts a root DNS server. Root servers do not have specific IP addresses for domains but can direct the resolver to the appropriate top-level domain (TLD) server.

TLD Server: The resolver then contacts the TLD server responsible for the domain's extension (eg, ".com" for commercial domains). The TLD server cannot provide the exact IP address but points the resolver to the authoritative DNS server for the specific domain.

Authoritative DNS server: The resolver queries this authoritative server.

IP Address Response: The authoritative DNS server returns the IP address (eg, x.x.x.0) for "example" to the DNS resolver.

User response: The DNS resolver caches the IP address for future use and sends it to your computer. Now, your computer knows where to find the web server for "example".

Connecting: Your web browser can now establish a connection with the web server using the given IP address and you can access the website.

DNS is a fundamental part of the Internet's infrastructure, ensuring that users can access websites and other online resources using human-readable domain names, rather than having to remember numeric IP addresses for each destination.

- What is DNS

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