Which of the following statements about DNS are correct? A typical answer from a

Question

Which of the following statements about DNS are correct? A typical answer from a top level domain name includes the IP address of the requested domain name. DNS provides one single service: to translate a name to an IP address. A DNS server uses caching to quickly answer similar questions. A local server helps other computer to ask their DNS questions. A typical answer from an authoritative domain server has the name of the name server that can finally answer the question. A root server performs recursive lookups on behalf of the requesting clients.

Explanation / Answer

1.FALSE

---> TLD known as the in-addr-arpa domian. it uses IP address to find DNS hostname just like DNS host name look up to find IP address.

2.TRUE

--> The mapping of host name to the IP address is handled by DNS worldwide. Which keep track of all host name /address information for all computers on internet.

3. TRUE

---> DNS cache server stores DNS query result for a period of time of each domain record , which help DNS to answer query and also reduce response time.

4.TRUE

---> A local DNS server lookup the domain name , it locates to the network at which your computer attached . the local DNS server seach in their cache , if not found then send it to the root server . the root server thus resolve the query.

5.TRUE

---> authoritative domain server is one that sattisfies quiries from its own data withoout needing to refreence another source . and if it is not having the answwer in their data it connec to to other authoritative server for the query.

6.FALSE

---> A root server is always iterative server.

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