Tuesday 1 September 2015

DNS Objective type Questions and Answers

11. What is the basic function of the nslookup program?
A. To probe the DNS database for various types of information
B. To look up only IP addresses in the DNS database
C. To look up only domain names in the DNS database
D. To look up only SOA records from a company’s database
Ans: A

12. What file does the nslookup program use to locate a name server?
A. The /etc/named.boot file
B. The /var/log/messages file
C. The /etc/hosts file
D. The /etc/resolv.conf file
Ans: D

13. Besides the name server process, what are the other parts of the BIND package?

A. The /etc/named.boot file
B. The /etc/hosts file
C. The name server data files
D. The /etc/resolv.conf file
Ans: A,C

14. What is the function of the directory directive in the name server configuration file?

A. To declare the server as an authoritative server for a zone
B. To establish the origin domain and name of the root cache file
C. To establish an initial path for later file references
D. To declare the server as a secondary server for a zone
Ans: C

15. For what purpose is the BIND root cache file used?

A. To serve as a zone file for the loopback address
B. To provide zone files for authoritative servers
C. To serve as a configuration file for the name server
D. To prime the name server with the root server’s addresses
Ans: D

16. What command would you use to direct nslookup to use a server other than the one specified in /etc/resolv.conf?

A. ls
B. server
C. set type
D. set server
Ans: B

17. What command would you use to direct nslookup to extract the SOA and HINFO records?

A. ls
B. server
C. set type
D. extract
Ans: C

18. How can PNRP names be protected from spoofing or poisoning?

A. with digital signatures
B. in perimeter networks
C. Pointer (PTR) records
D. in a highly-secure environment
Ans: A

19. What is the most common record type in DNS?
A. name records
B. reverse lookup
C. Host (A) records
D. dnscmd.exe
Ans: C

20. In what format are IPv6 addresses usually displayed?
A. canonical name (CNAME)
B. Host (A) records
C. the Mail exchanger (MX) record
D. in hexidecimal format
Ans: D

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