Correct Answer:
Explanation/Reference:
* No.
With a recursive name query , the DNS client requires that the DNS server respond to the client with either the requested resource record or an error message stating that the record or domain name does not exist. The DNS server cannot just refer the DNS client to a different DNS server.
* No. * Yes.
An iterative name query is one in which a DNS client allows the DNS server to return the best answer it can give based on its cache or zone data. If the queried DNS server does not have an exact match for the queried name, the best possible information it can return is a referral (that is, a pointer to a DNS server authoritative for a lower level of the domain namespace). The DNS client can then query the DNS server for which it obtained a referral. It continues this process until it locates a DNS server that is authoritative for the queried name, or until an error or time-out condition is met.
Example:
Reference: Recursive and Iterative Queries
Answers should be: Yes, No, Yes
When you visit a website on the Internet, the computer you use will find the address of the site using a system called DNS. If you are using your home computer to browse the Internet, it will request each website address from your Internet Service Provider (ISP).
Dedicated and Virtual Servers are set up to search for this DNS information themselves. This is perfectly normal and is a commonly used feature for office or cloud networks.
There are two types of DNS queries that can be made to your server, which are as follows:
—- Recursive requests: With these requests your server will attempt to find the website in question in its local cache. If it cannot find an answer it will query other DNS servers on your behalf until it finds the address. It will then respond to the original request with the results from each server’s query.
—- Iterative requests: With these requests the DNS server will attempt to find the website in question in its local cache. If it cannot find an answer it will not ask other DNS servers but will reply back to the original request with a single “I don’t know, but you could try asking this server” message.
With a recursive DNS query, the DNS Server does contact other DNS servers.
That should be yes!
This question get repeatedly asked…. I saw this on several websites as well as in my MTA test too!!
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