What is DNS System in Computer?

DNS stands for Domain Name System. DNS resolves queries and converts them to IP addresses. DNS resolvers are designated as “authoritative name servers” and are controlled by the operating system. Users never have to interact with the DNS resolver. DNS queries are handled transparently by Internet applications such as web browsers and e-mail clients. After a query is processed, the system passes it to the corresponding IP address.

The DNS is a network protocol that specifies a database of information elements for resources on the Internet. Resource records contain the name of a network resource and its type, expiration time, and class. These records may have multiple IP addresses associated with them. DNS queries use User Datagram Protocol (UDP) on port 53. The client requests the server to provide the information for a particular resource, which returns the complete set of resources. DNS servers may implement round-robin ordering. Other DNS resolvers use TCP for all communication.

A DNS server answers questions both inside and outside its domain and provides authoritative answers. DNS servers are managed by ISPs. Domain names are included in URLs and contain multiple labels. Each section denotes a subdivision of a domain. DNS records are stored on different computers. These computers and devices are connected to the internet by DNS. When a person wants to access a website, they have to input the domain name and the IP address of the website.

The DNS records hold domain information. Each IP address contains information about the host, such as the IP address. IPv6 addresses use AAAA records. A DNS zone can have more than one A record. An A record specifies an IP address, while a single A record can be used to find an IP address. This DNS zone refers to an authoritative name server. These name servers are responsible for routing the website to the appropriate IP address.

DNS servers cache DNS records. This makes the DNS lookup process more efficient. A DNS cache can hold information on a website, which helps the computer process faster. Usually, the DNS cache database is stored locally, but it is not always sufficient. When a website’s DNS cache database doesn’t contain the information required to resolve a domain name, the computer sends the request to an Internet Service Provider or a DNS server.

While these two systems have many applications, DNS plays a key role in most internet applications. DNS translates the domain name in a URL to the corresponding IP address. DNS enables internet users to access information stored on websites and applications. Besides the Internet, DNS supports various applications, including virtual hosting. For instance, DNS can be used to determine the location of a website. The DNS also resolves hostnames and IP addresses.

The DNS system is the most common Internet protocol. Whether you’re looking for an address or an IP address, DNS resolvers will answer. The DNS servers store information in a database called a zone file. The recursive resolver returns the IP address to the client. This process repeats itself until the client’s query has reached an authoritative server. The authoritative server then answers the query. This process is called “recurrence”

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