The CSM Tech organization has a substantial web presence with several publicly accessible web and application servers. You have DNS servers that handle Internet queries for all your publicly accessible resources. However, after doing some statistics analysis on your public DNS servers, you find that your servers are handling recursive lookups for clients that are not within your organization. Your public DNS servers should handle recursive queries only for your internal clients, but the servers should handle iterative (nonrecursive) queries from external sources. What do you recommend? What are the commands needed to implement the solution?

So as to interface web we have not impair any recursive.But,internal DNS to firewall will give moderately security framework to parcel of cases.in generally,recursion is empower for DNS server. DNS server will bolster for non-recursive query,

Step 1: Operating framework resolver must sending a DNs question for A record to particularly non-recursive server.The non recursive inquiry will take a gander at the tables for discovering IP address.The Non recursive server Will answer back with the root server.we can utilize resolver,query,DNS server,Root server,COM server while getting a solicitation from program by the non-recursive (iterative) DNS inquiry.