How DNS Works.pptx

Domain Name Server (DNS) is a system that includes a database of the public IP addresses with website names. It acts as a resolver that converts domain names to IP addresses. If a user wants to open Google on the chrome page, DNS will resolve the name Google and check for the IP address in the cache memory. Based on the IP address, the computer gets connected with the web server and retrieves the web page to perform various actions on the Google web page.

1. How DNS Works? www.infosectrain.com | [email protected]

2. www.infosectrain.com | [email protected] Like humans communicate with each other, computers also do communicate with each other, but not by the names; they have their unique numbers, such as IP addresses over a network. Humans are customized to address by the names instead of numbers to identify a person or a site. To communicate between computers and humans, networking engineers developed a Domain Name Server (DNS). This blog is curated about how DNS works. But before that, What is DNS ?

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4. www.infosectrain.com | [email protected] What is DNS ? Domain Name Server (DNS) is a system that includes a database of the public IP addresses with website names. It acts as a resolver that converts domain names to IP addresses. If a user wants to open Google on the chrome page, DNS will resolve the name Google and check for the IP address in the cache memory. Based on the IP address, the computer gets connected with the web server and retrieves the web page to perform various actions on the Google web page.

5. www.infosectrain.com | [email protected] How Does DNS Work? DNS works collectively to resolve the IP address for the domain name with various DNS servers.

6. www.infosectrain.com | [email protected] If you type a domain name in the web browser and the system can’t find the IP address in its cache memory, it will redirect the query to the Resolver server . The Resolver server is an Internet Service Provider (ISP); it checks for the IP address in its cache memory. If it can’t find the IP address, it will further redirect the query to the root server . The Root server is the top server of the DNS hierarchy, including 13 sets of root servers around the world. Each set of the root servers has its unique IP address. When the root server receives the query for the IP address but can’t find it, and sends the query to the TLD . The TLD server is the Top-level Domain Server that stores various address information for the domains such as .net , .com, .en, .org, and more. When the query is received but can’t find the IP address, the TLS redirects the resolvers to the Authoritative Name Servers .

7. www.infosectrain.com | [email protected] 5. The Authoritative Name Server is responsible for knowing everything about Domain, including the IP address. When the query is received from the DNS resolver, the authoritative name server should respond to the server with the IP address . 6.And the DNS resolver will communicate with the system to retrieve the web page. Once the DNS resolver receives an IP address from various servers, it stores the IP address in its cache memory. In case, if the computer sends the same query for the same domain name, it can retrieve the IP address from memory and mitigates the whole DNS Server process in the search for the IP address.

8. www.infosectrain.com | [email protected] Final Words InfosecTrain is one of the best IT Training and consulting platforms that offers an instructor-led training program on various IT security and cybersecurity domains. It provides the Network Security Training course by the well-experienced and certified trainers to cover a wide range of Networking concepts. To know more details, check out and enroll now.

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