Domain Name Service  «Prev  Next»

Domain Name Service - Quiz

Each question is worth one point. Select the best answer or answers for each question.
1. What does DNSSEC provide?
Please select the correct answer:
  A. It encrypts DNS queries so that an observer on the network cannot read them
  B. It lets a resolver verify that a response is authentic and unmodified, through a chain of signatures leading back to the root
  C. It restricts which certificate authorities may issue certificates for a domain
  D. It replaces zone transfers with an authenticated alternative

2. What is a name server?
Please select the correct answer:
  A. A branch of the DNS namespace under the administrative control of some entity
  B. The primary server which has the official or authoritative information on its zone
  C. A process that accepts queries into the DNS database, or the computer on which this process runs
  D. A secondary server providing an alternative source for information on the zone

3. What distinguishes a primary server?
Please select the correct answer:
  A. The authoritative data for its zone originates there, loaded from a local zone file or a provisioning back end rather than transferred from another server
  B. It distributes query load and provides a backup source of answers for the zone
  C. It obtains its copy of the zone by transferring the data periodically from another server
  D. It answers on behalf of client resolvers by caching results and holds no zone of its own

4. What is the purpose of the Canonical Name (CNAME) Resource Record type?
Please select the correct answer:
  A. To publish the mail servers that accept mail for a domain
  B. To map a host name to an IPv6 address
  C. To define an alias, pointing one name at another name
  D. To delegate a subdomain to a different set of name servers

5. What is the purpose of the Pointer (PTR) Resource Record type?
Please select the correct answer:
  A. To map a host name to an IPv4 address in the forward-lookup zone
  B. To map an address back to a host name, published in a reverse-lookup zone
  C. To set the parameters that govern how long a negative answer may be cached
  D. To list the certificate authorities permitted to issue for the name

6. What is the purpose of the Host Information (HINFO) Resource Record type?
Please select the correct answer:
  A. To record the address of the party responsible for the zone
  B. To give the operating system and machine architecture of the named host
  C. To publish an arbitrary text string, often used to prove control of a domain
  D. To advertise the host and port at which a particular service is offered

7. What role do the root servers play in name resolution?
Please select the correct answer:
  A. They perform recursion on behalf of client resolvers
  B. They answer with referrals to the top-level domain servers, giving a resolver the starting point for its walk down the tree
  C. They hold a copy of every domain name registered on the Internet
  D. They act as secondary servers for any zone whose primary becomes unreachable

8. Through what process is the distributed DNS database bound together?
Please select the correct answer:
  A. Recursion
  B. Reverse lookup
  C. Subnetting
  D. Zone transfer