A domain is a name that is unique and unambiguous worldwide on the Internet. The domain can be used for websites and emails. Name System (DNS) is a decentralized search service that translates a human-readable domain name or A Uniform Resource Locator identifies and locates a resource, for example a website, via the access method to be used and the location of the resource in computer networks. into the • Internet protocol: IP is responsible for addressing a data packet. IP encapsulates the data packet that is to be transmitted and adds an address header. The header contains information about the IP addresses of the sender and recipient. The order in which the packets are sent or received is irrelevant to the protocol. It also does not guarantee that... address of the server hosting the website or service. This characteristic of the worldwide distribution of DNS is an important component of the Internet. DNS has been used since 1985.
A DNS server serves two purposes. The first is to maintain a cache that contains domain names that were recently searched for, which improves performance and reduces network traffic. The second is to act as the start of authority (SOA) for all related domains. When a DNS server tries to resolve a domain name that is not in its cache, it starts at the top level (the period) and then works its way through the subdomains until it finds the DNS server that is acting as the SOA. As soon as this is found, the IP address of the domain is stored in its local cache.
The DNS also contains certain entries related to the domain. These records include Start of Authority (SOA), IP addressing (A and AAAA), Simple Mail Transfer Protocol (SMTP): SMTP is another of the three email protocols. It is most commonly used for sending email from an email client through an email server. This protocol uses TCP for the administration and delivery of the e-mail. email (MX), name server (NS), and CNAME (domain name alias) records.