Domain Name System (DNS) is a hierarchical distributed database that provides a way for devices on the Internet to communicate with each other by name. Each device on the network has a unique IP address, but most devices have names, such as “www.example.
com.” DNS maps these names to their corresponding IP addresses.
A DNS subdomain is a named section of a domain name. For example, the domain name “www.com” is divided into subdomains, such as “www.
com/sub1,” “www.com/sub2,” and so on. The DNS server for a subdomain will have a different IP address than the DNS server for the parent domain name.
A domain name is the complete name of a domain, such as “example.com.” A domain name consists of a top-level domain (TLD), such as “com,” and one or more second-level domains (SLDs), such as “example.
” A TLD is the first level of the Domain Name System hierarchy. A SLD is the second level of the Domain Name System hierarchy.
A DNS record is a resource record in the Domain Name System. A DNS record contains the name of a domain, the address of a DNS server for that domain, and other information.
For example, a DNS record for the domain name “www.com” might contain the following information:.
www. 8.
8.8.
A DNS server looks up the name of a domain in its DNS database and returns the corresponding IP address if it exists. If the name of the domain doesn’t exist in the DNS database, the DNS server will return an error message.
