Objective 1.04 Explain the Dataflow of the DNS Query Process [iterative, Recursive, Lame Delegation, Host File, and Resolvers] 302 Practice Questions (Page 2)

Questions 6–10

1. 6application · medium

   A BIG-IP DNS is configured as a recursive resolver. A client sends a query for 'www.example.com'. The resolver has no cached data for this name. Which sequence of actions will the resolver perform?

   • AReturn a referral to the client so the client can query the root server.
   • BQuery the root server, then the .com TLD server, then the example.com authoritative server, and return the answer to the client.
   • CForward the query to the client's configured DNS server.
   • DQuery the example.com authoritative server directly and return the answer.
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2. 7application · medium

   A BIG-IP DNS is configured as a recursive resolver. A client sends a query for 'www.example.com'. The resolver has a cached record for 'example.com' NS records but no cached A record for 'www.example.com'. What should the resolver do next?

   • AQuery the .com TLD server to get the NS records for example.com.
   • BQuery the root server again to get the NS records for example.com.
   • CReturn a referral to the client with the NS records.
   • DQuery the example.com authoritative server directly using the cached NS records.
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4. 8foundation · easy

   In an iterative DNS query, what does a DNS server do when it does not have the requested record?

   • AIt returns a failure response and does not provide any further information
   • BIt returns the best answer it has, which may be a referral to another server
   • CIt forwards the query to the root server and waits for the response
   • DIt queries other DNS servers on behalf of the client until it finds the answer
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5. 9foundation · easy

   A user types a domain name into a browser. The browser sends a query to a recursive resolver. What is the resolver's responsibility in this scenario?

   • ATo only query the root server and return whatever response it receives
   • BTo perform the full resolution process on behalf of the client, following referrals until it obtains the final answer
   • CTo return the best answer it currently has, even if that means referring the client to another server
   • DTo forward the query unchanged to the authoritative server for the domain
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6. 10foundation · easy

   What is the primary difference between a recursive query and an iterative query?

   • ARecursive queries are only used by authoritative servers, while iterative queries are used by resolvers
   • BRecursive queries are faster because they use caching, while iterative queries do not use caching
   • CRecursive queries require the server to return the final answer, while iterative queries allow the server to return a referral
   • DRecursive queries are sent from clients to servers, while iterative queries are sent from servers to servers
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