DNS is a system that allows computers to communicate with each other by translating domain names (such as “www.example.
com”) into IP addresses. It does this by using a set of name servers, each of which is responsible for a certain zone.
When you type in a domain name (such as “www.
com”), your computer contacts one of the name servers and asks it to look up the IP address for that domain. The name server then returns a list of IP addresses, one per line.
If you’re using a broadband connection, your computer will automatically contact one of the name servers in the DNS database and request an IP address for the domain “www.google.com”. The name server will return the IP address 203.
0.113.202.
If you’re using a dial-up connection, your computer will contact one of the name servers in the DNS database and request an IP address for the domain “www.yahoo. The name server will return the IP address 204.
71.223.22.
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An authoritative name server is a server that is specifically designated by the Domain Name System (DNS) to provide information about the names of servers and other resources in a domain. The authoritative name server is usually the first server that is contacted when a user queries for a domain name or host name. Authoritative name servers are important for two reasons.
Authoritative name servers are responsible for ensuring that the correct DNS records are placed for a given name. When a user types in a URL, the authoritative name server will look up the correct record for the given name and return it to the user’s computer. If the user’s computer doesn’t have an authoritative name server configured, then it will try to contact one of the name servers that is listed in the user’s DNS configuration.
Domain Name System (DNS) is the system used by computers to resolve hostnames (such as www.google.com) to IP addresses. DNS is a hierarchical naming system, in which each node (a computer, a DNS server, or a root zone) in the system contains a list of hostnames and IP addresses. When a computer needs to resolve a hostname, it queries a DNS server for the information.
