COMPUTER NETWORKS AND COMMUNICATIONS
LAN WAN AND THE INTERNET
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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DNS doesn’t help access websites
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DNS looks up the IP address for a website
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DNS is a way of speeding up the internet
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IP looks up the DNS for a website
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Detailed explanation-1: -The Internet’s DNS system works much like a phone book by managing the mapping between names and numbers. DNS servers translate requests for names into IP addresses, controlling which server an end user will reach when they type a domain name into their web browser. These requests are called queries.
Detailed explanation-2: -An initial DNS query for an IP address is made to a recursive resolver. This search first leads to a root server, which has information on top-level domains (.com, .net, .org), as well as country domains. Root servers are located all around the world, so the DNS system routes the request to the closest one.
Detailed explanation-3: -The Domain Name System (DNS) turns domain names into IP addresses, which browsers use to load internet pages. Every device connected to the internet has its own IP address, which is used by other devices to locate the device.
Detailed explanation-4: -If it doesn’t have the domain name and IP address in its database, it contacts another DNS server on the internet. It may have to do this multiple times. If it has to contact another DNS server, it caches the lookup results for a limited time so it can quickly resolve subsequent requests to the same domain name.
Detailed explanation-5: -Open the command prompt. Type nslookup followed by the IP address and press ‘Enter. ‘ For example, it can be nslookup 8.8. 8.8. Now, the command prompt will return the DNS name and the IP you entered. 27-Jan-2023