DNS servers recognize two types of name resolution requests. These two types are..
web queries
iterative queries
recursive queries
address queries
answer
iterative queries
recursive queries
question
Which of the following would be the correct FQDN for a resource record in a reverse lookup zone, if the host's IP address is 10.75.143.88?
127.0.0.1.in-addr.arpa
10.75.143.88.in-addr.arpa
in-addr.arpa.88.143.75.10
88.143.75.10.in-addr.arpa
answer
88.143.75.10.in-addr.arpa
question
What are the servers at the top of the DNS hierarchy called?
Down-level servers
Authoritative sources
Root servers
Forwarders
answer
Root servers
question
The typical query one DNS server sends to a root name server is called a(n) _______.
recursive query
iterative query
referral
forwarded query
answer
recursive query
question
The domain name part of a DNS name is _______ and consists of two or more words, separated by ______.
peer-based; periods
hierarchical; commas
unranked; commas
hierarchical; periods
answer
hierarchical; periods
question
What do you call the source responsible for maintaining a domain's resource records?
Authenticate source
Authoritative source
Root server
Down-level server
answer
Authoritative source
question
When using DNS for name resolution only, why should a company consider using DNS servers outside the network perimeter?
Less administration
Less internal traffic
Fewer servers in the communications server rack
Less traffic crossing the network perimeter
answer
Less traffic crossing the network perimeter
question
At what level of the DNS hierarchy are actual hosts, apart from the root servers?
At the root servers level
At the top-level domain level
At the second-level domain level
At the third-level domain level
answer
At the second-level domain level
question
Who is responsible for the ratification of new top-level domains?
Internet Corporation for Assigned Names and Numbers (ICANN)
Network Solutions, Inc. (NSI, formerly known as InterNIC)
Internet Assigned Numbers Authority (IANA)
Contoso.com
answer
Internet Corporation for Assigned Names and Numbers (ICANN)
question
What is the character limit on individual domain names, and the limit on the Fully Qualified Domain Names (FQDNs)?
15; 64
63; 255
31; 128
63; 128
answer
63; 255
question
Concerning DNS, what is negative caching?
When a DNS server receives incorrect information about a host
When a DNS server receives obsolete information about a host
When a DNS server receives information about a non-existent host
When a DNS server forwards incorrect information about a host
answer
When a DNS server receives information about a non-existent host
question
A DNS server receives updated information. Other DNS servers have outdated information cached. What determines the amount of time that the old DNS data remains cached on a server and an update might occur?
The distance (number of network hops) between the new information and queried DNS server
Network congestion between DNS servers
Time To Live (TTL) specified by each DNS server's administrator
The version of Windows Server on the DNS server
answer
Time To Live (TTL) specified by each DNS server's administrator
question
What is the default TTL for a Windows Server 2012 R2 DNS server?
1 hour
12 hours
5 minutes
36 hours
answer
1 hour
question
Why is the DNS service included in Windows Server 2012 R2 integrated with DHCP service?
To allow a DNS server to inform DHCP clients with updated information.
To update both DNS and DHCP clients with information from the Active Directory.
To allow a DHCP server to request a DNS server to update or create a record.
DNS and DHCP services are not integrated in Windows Server 2012 R2.
answer
To allow a DHCP server to request a DNS server to update or create a record.
question
You registered the domain name contoso.com. The FQDNs seattle.contoso.com and halifax.contoso.com are examples of different _____.
subdomains of contoso.com
second-level domains
top-level domains
IP addresses
answer
subdomains of contoso.com
question
When a DNS server communicates a name resolution query to another DNS server, what type of datagram is used, and over what port?
UDP; 35
TCP; 35
UDP; 53
TCP; 53
answer
UDP; 53
question
Concerning DNS domain hierarchy, what are examples of global top-level domains?
.com, .net, .org
.mil, .gov, .edu
.aero, .name, .pro
.ca, .cz, .kr
answer
.com, .net, .org
question
What are some best practices when creating internal DNS namespaces?
Avoid an excessive number of domain levels.
Keep domain names full and descriptive; avoid concise subdomains.
Place less importance on a convention compared to spelling.
Never abbreviate.
answer
Avoid an excessive number of domain levels.
question
What is the primary purpose of name caching?
Name caching saves an extraordinary amount of time for the user.
Name caching greatly reduces traffic on the company network.
Name caching validates why you should deploy caching-only servers.
Name caching enables the second name resolution request for the same name to bypass the referral process.
answer
Name caching enables the second name resolution request for the same name to bypass the referral process.
question
What client applications utilize DNS to resolve host names into IP addresses?
Client web browsers, or any application that uses HyperText Transfer Protocol (HTTP), use DNS to resolve host names into IP addresses.
All Internet applications working with host names must use DNS to resolve host names into IP address.
Any application on a system that has connectivity to the Internet uses DNS to resolve host names into IP addresses.
DNS does not resolve host names into IP addresses.
answer
All Internet applications working with host names must use DNS to resolve host names into IP address.
question
What is the primary benefit of a DNS forwarder?
Exchanging iterative queries for recursive queries across the network perimeter
Reducing the traffic and making efficient use of available bandwidth across the network perimeter
Making the most of iterative queries to other DNS servers
Reducing the burden on the Internet's root name servers
answer
Reducing the traffic and making efficient use of available bandwidth across the network perimeter
question
What DNS server represents the top of the DNS hierarchy?
Root name server
Caching-only server
Forwarder
Authoritative source
answer
Root name server
question
What DNS server is never the authoritative source for a domain, but only serves to resolve names?
Root name server
Caching-only server
Forwarder
Authoritative source
answer
Caching-only server
question
What DNS server normally sends iterative queries to another DNS server?
Root name server
Caching-only server
Forwarder
Authoritative source
answer
Forwarder
question
What DNS server is responsible for maintaining a particular domain's resource records?
Root name server
Caching-only server
Forwarder
Authoritative source
answer
Authoritative source
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