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Domain Name Service Basics - Quiz

Each question is worth one point. Select the best answer or answers for each question.
1. What is a top-level domain?
Please select the best answer.
  A. The label that identifies the type of organization owning the domain
  B. The label immediately below the DNS root, delegated by IANA and published in the root zone
  C. The portion of a domain name that identifies an individual host
  D. A subdivision an organization creates for its own departments and divisions

2. What is a reverse lookup?
Please select the best answer.
  A. A way to find the numeric IP address of a host by using the name of that host
  B. A way to query the registry for the ownership and contact details of a domain
  C. A way to find the name of a host by using the numeric IP address of that host
  D. A way to subdivide a domain name into additional names

3. How is the DNS namespace organized?
Please select the best answer.
  A. Into numeric IP addresses and host names
  B. Into a flat list of registered names distributed as a single central file
  C. Into a tree of domains and subdomains
  D. Into absolute path names of files in the UNIX system

4. A caching resolver with an empty cache is asked to resolve www.corporation.com. In what order does it query the name servers?
Please select the best answer.
  A. It queries the corporation.com servers first, then works upward toward the root if they do not answer
  B. It queries a root server, then the com servers it is referred to, then the corporation.com servers
  C. It queries its ISP, which holds a complete copy of the DNS database
  D. It reads the local hosts file, which contains every registered domain name

5. Inside a zone file for corporation.com, what is the difference between writing www and writing www.corporation.com. with a trailing dot?
Please select the best answer.
  A. There is no difference; a zone file expands both forms identically
  B. The first is relative and has the origin appended, while the trailing dot marks a fully qualified name that is used exactly as written
  C. The trailing dot is a typographic convention that name server software ignores
  D. A relative name such as www is not valid inside a zone file

6. Who maintains the contents of the com zone, and how does a change you make at your provider reach it?
Please select the best answer.
  A. ICANN publishes every second-level com domain directly
  B. A registry operator maintains the com zone, accredited registrars submit registrations on behalf of registrants, and IANA administers the root and the delegation of com itself
  C. Each registrant edits the com zone file directly through an assigned account
  D. The root servers hold every com name, so no separate registry is required