Domain Name System (DNS)
Principle of DNS
. Entering a website address. The user enters the address of the desired site in the browser.
Recursive query. The browser asks the local DNS server for the IP address of the domain. Recursive query>.
Iterative query. If the local server has no answer, it sends a request to another DNS-server. Most often it is the server of the Internet service provider. Iterative query.
Redirection. The process continues until the DNS server can provide an IP address or confirm that it does not exist.
Answer. The IP address is returned to the browser, which can now load the website.
Benefits of DNS
Ease of use. DNS allows users to connect to websites using easy domain names instead of complex numeric IP addresses.
Efficiency. DNS servers cache previously requested IP addresses so that you can find the desired site faster in the future.
Load balancing. DNS distributes requests between several servers to prevent one server from becoming a bottleneck. Load balancing.
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