ESAT Forouzan - Chapter 25: Domain Name Systems (DNS)

Question 1

In the domain name chal.atc.fhda.edu, _____ is the least specific label.
a. chal
b. atc
c. fhda
d. edu

Answer 1

d. edu

Question 2

In the domain name chal.atc.fhda.edu, _____ is the most specific label.
a. chal
b. atc
c. fhda
d. edu

Answer 2

a. chal

Question 3

Which of the following domain names would most likely use a country domain to resolve its IP address?
a. chal.atc.fhda.edu
b. gsfc.nasa.gov
c. kenz.acct.sony.jp
d. mac.eng.sony.com

Answer 3

c. kenz.acct.sony.jp

Question 4

A DNS response is classified as _____ if the information comes from a cache memory.
a. Authoritative
b. Unauthoritative
c. Iterative
d. Recursive

Answer 4

b. Unauthoritative

Question 5

In _____ resolution the client is in direct contact with at most one server.
a. A recursive
b. An iterative
c. A cache
d. All of the above

Answer 5

a. A recursive

Question 6

In _____ resolution the client could directly contact more than one server.
a. A recursive
b. An iterative
c. A cache
d. All of the above

Answer 6

b. An iterative

Question 7

In address-to-name resolution the _____ domain is used.
a. Inverse
b. Reverse
c. Generic
d. Country

Answer 7

a. Inverse

Question 8

How is the lifetime of a name-to-address resolution in cache memory controlled?
a. By the time-to-live field set by the server
b. By the time-to-live counter set by the server
c. By the time-to-live field set by the authoritative server
d. B and C

Answer 8

d. B and C

Question 9

In the string 219.46.123.107.in-addr.arpa, what is the network address of the host we are looking for?
a. 219.46.123.0
b. 107.123.0.0
c. 107.123.46.0
d. 107.0.0.0

Answer 9

d. 107.0.0.0

Question 10

A host with the domain name pit.arc.nasa.gov is on the _____ level of the DNS hierarchical tree. (the root is level 1)
a. Third
b. Fourth
c. Fifth
d. Not enough information given

Answer 10

c. Fifth

Question 11

A host with the domain name trinity.blue.vers.inc is on the _____ level of the DNS hierarchical tree. (the root is level 1)
a. Third
b. Fourth
c. Fifth
d. Not enough information given

Answer 11

d. Not enough information given

Question 12

A DNS _____server gets its data from another DNS server.
a. Primary
b. Secondary
c. Root
d. All of the above

Answer 12

b. Secondary

Question 13

A DNS _____server creates, maintains, and updates the zone file.
a. Primary
b. Secondary
c. Root
d. All of the above

Answer 13

a. Primary

Question 14

A DNS _____ server’s zone is the entire DNS tree.
a. Primary
b. Secondary
c. Root
d. All of the above

Answer 14

c. Root

Question 15

A resolver is the _____.
a. DNS client
b. DNS server
c. Host machine
d. Root server

Answer 15

a. DNS client

Question 16

To find the IP address of a host when the domain name is known, the _____ can be used.
a. Inverse domain
b. Generic domains
c. Country domains
d. B or C

Answer 16

a. Inverse domain