CNIT 34220 FINAL EXAM QUESTIONS WITH VERIFIED
ANSWERS
DNS - Answers - Domain Name System
What is the purpose of Name Resolution - Answers - Mapping station names back to IP
addresses
What is a host file used for? - Answers - A host file contains static name resolutions. It is
common to both DNS host names.
What standard does DNS follow - Answers - IETF Standard (RFC 881/882/883)
True or false: DNS is hierarchical in nature - Answers - True:
DNS servers report to other DNS servers above them, until they hit the root sever
What is the traditional DNS approach? - Answers - Static Domain Name resolution
Which of these does NOT describe static name resolution?
-Hard Coded list of names and IP Addresses
-Assumes a station always has the same IP address
-Works well with Manual or BOOTP
-Works well with DHCP - Answers - Works well with DHCP
True or False:
"host.subdomain(s).top_level_domain" is the correct form for DNS Name Space
Structure - Answers - True
How many characters are in a DNS domain? - Answers - 63
How many levels of a domain does DNS support? - Answers - 127
What character is used to separate domain levels? - Answers - the period ( . )
True or False:
Each domain level can be the same but it is common practice to make them unique. -
Answers - False. It must be unique.
How is authority handed down in DNS name space structure? - Answers - Top level to
lower level
,Draw a diagram explaining how DNS works - Answers - Acceptable responses include a
depiction of the DNS Hierarchy and numbered paths explaining requests and
responses.
What group manages the top level domains - Answers - InterNIC
Name some traditional top level domains - Answers - .edu, .com, .gov, .mil, .org, .us
List some of the newer top level domains - Answers - .biz, .info, .name, .pro, .aero,
.coop, .museum
Who holds the second level domain authority - Answers - the domain owner
Who can create subdomains - Answers - The domain owner
True or false:
Domains map back to the names used in the DNS hierarchy - Answers - True
True or False:
A zone manages methods for domain representation - Answers - False:
Zones represent the method used to manage domains
What is the purpose of a zone? - Answers - A zone is authoritative for a domain or sub-
domain
Where are sub-domains stored? - Answers - Sub-domains can have their own zone OR
stores within a single zone
Each second level domain server requires how many authoritative servers? - Answers -
At least two
How many hours a day does a DNS server have to be up to be qualified for
authoritative? - Answers - 24/7
True or False:
An authoritative server contains the DNS entries - Answers - True
Which of these is NOT true regarding authoratative/root servers?
-A second level DNS server must connect to at least 2 of these
-Servers are run 24/7
-The root server must know about all of the second level domain servers
, -The are 13 root servers
-Root servers are managed by InterNIC
-Root servers hold authority of sub-domains as well as domains - Answers - Root
servers hold authority of sub-domains as well as domains
what are the two dns methods? - Answers - iterative and recursive
What is another name for the end node? - Answers - Resolver
Explain how the recursive query works? - Answers - An end node (resolver) in the
tech.purdue.edu domain asks the local Purdue DNS server for the IP address for
www.slashdot.org. The purdue server wouldnt know so it will ask its authoratative server
for the address. So on and so forth until an address is found and returned down the
chain.
A recursive query is obligated to receive a response from _____________? - Answers -
the name server
What happens to resolved names in DNS? - Answers - They are cached by name
servers.
The name server has cached Purdue.edu as 192.168.33.2.
Little Pat is trying to access purdue.edu. What address will he get, if he gets one and
why? - Answers - 192.168.33.2 because this address is in cache
What is TTL mean? - Answers - Time to Live
In relationship to DNS, what is TTL used for? - Answers - TTL is used in caching to
determine how long a server holds cached information.
What is an SOA? - Answers - A file for each zone that contains records
It states that this is the definitive name server for the domain
What does an NS record do? - Answers - It acknowledges the name server in the
domain.
Write an NS record - Answers - net.lcl NS ns1.net.lcl
What is an A record - Answers - An A record in an address record. It is used to translate
the domain name to the IP address.
Write an A record - Answers - rtfm IN A 192.168.1.11
user1.vpn IN A 172.17.89.5
What is an MX record? - Answers - An MX record handles Mail Exchange information.
ANSWERS
DNS - Answers - Domain Name System
What is the purpose of Name Resolution - Answers - Mapping station names back to IP
addresses
What is a host file used for? - Answers - A host file contains static name resolutions. It is
common to both DNS host names.
What standard does DNS follow - Answers - IETF Standard (RFC 881/882/883)
True or false: DNS is hierarchical in nature - Answers - True:
DNS servers report to other DNS servers above them, until they hit the root sever
What is the traditional DNS approach? - Answers - Static Domain Name resolution
Which of these does NOT describe static name resolution?
-Hard Coded list of names and IP Addresses
-Assumes a station always has the same IP address
-Works well with Manual or BOOTP
-Works well with DHCP - Answers - Works well with DHCP
True or False:
"host.subdomain(s).top_level_domain" is the correct form for DNS Name Space
Structure - Answers - True
How many characters are in a DNS domain? - Answers - 63
How many levels of a domain does DNS support? - Answers - 127
What character is used to separate domain levels? - Answers - the period ( . )
True or False:
Each domain level can be the same but it is common practice to make them unique. -
Answers - False. It must be unique.
How is authority handed down in DNS name space structure? - Answers - Top level to
lower level
,Draw a diagram explaining how DNS works - Answers - Acceptable responses include a
depiction of the DNS Hierarchy and numbered paths explaining requests and
responses.
What group manages the top level domains - Answers - InterNIC
Name some traditional top level domains - Answers - .edu, .com, .gov, .mil, .org, .us
List some of the newer top level domains - Answers - .biz, .info, .name, .pro, .aero,
.coop, .museum
Who holds the second level domain authority - Answers - the domain owner
Who can create subdomains - Answers - The domain owner
True or false:
Domains map back to the names used in the DNS hierarchy - Answers - True
True or False:
A zone manages methods for domain representation - Answers - False:
Zones represent the method used to manage domains
What is the purpose of a zone? - Answers - A zone is authoritative for a domain or sub-
domain
Where are sub-domains stored? - Answers - Sub-domains can have their own zone OR
stores within a single zone
Each second level domain server requires how many authoritative servers? - Answers -
At least two
How many hours a day does a DNS server have to be up to be qualified for
authoritative? - Answers - 24/7
True or False:
An authoritative server contains the DNS entries - Answers - True
Which of these is NOT true regarding authoratative/root servers?
-A second level DNS server must connect to at least 2 of these
-Servers are run 24/7
-The root server must know about all of the second level domain servers
, -The are 13 root servers
-Root servers are managed by InterNIC
-Root servers hold authority of sub-domains as well as domains - Answers - Root
servers hold authority of sub-domains as well as domains
what are the two dns methods? - Answers - iterative and recursive
What is another name for the end node? - Answers - Resolver
Explain how the recursive query works? - Answers - An end node (resolver) in the
tech.purdue.edu domain asks the local Purdue DNS server for the IP address for
www.slashdot.org. The purdue server wouldnt know so it will ask its authoratative server
for the address. So on and so forth until an address is found and returned down the
chain.
A recursive query is obligated to receive a response from _____________? - Answers -
the name server
What happens to resolved names in DNS? - Answers - They are cached by name
servers.
The name server has cached Purdue.edu as 192.168.33.2.
Little Pat is trying to access purdue.edu. What address will he get, if he gets one and
why? - Answers - 192.168.33.2 because this address is in cache
What is TTL mean? - Answers - Time to Live
In relationship to DNS, what is TTL used for? - Answers - TTL is used in caching to
determine how long a server holds cached information.
What is an SOA? - Answers - A file for each zone that contains records
It states that this is the definitive name server for the domain
What does an NS record do? - Answers - It acknowledges the name server in the
domain.
Write an NS record - Answers - net.lcl NS ns1.net.lcl
What is an A record - Answers - An A record in an address record. It is used to translate
the domain name to the IP address.
Write an A record - Answers - rtfm IN A 192.168.1.11
user1.vpn IN A 172.17.89.5
What is an MX record? - Answers - An MX record handles Mail Exchange information.
