Chapter 12

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.

Name caching enables the second name resolution request for the same name to bypass the referral process.

DNS servers recognize two types of name resolution requests. These two types are.. web queries iterative queries recursive queries address queries

iterative queries recursive queries

Concerning DNS domain hierarchy, what are examples of global top-level domains? .com, .net, .org .mil, .gov, .edu .aero, .name, .pro .ca, .cz, .kr

.com, .net, .org

What is the default TTL for a Windows Server 2012 R2 DNS server? 1 hour 12 hours 5 minutes 36 hours

1 hour

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

63; 255

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

88.143.75.10.in-addr.arpa

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.

All Internet applications working with host names must use DNS to resolve host names into IP address.

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

At the second-level domain level

What DNS server is responsible for maintaining a particular domain's resource records? Root name server Caching-only server Forwarder Authoritative source

Authoritative source

What do you call the source responsible for maintaining a domain's resource records? Authenticate source Authoritative source Root server Down-level server

Authoritative source

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.

Avoid an excessive number of domain levels.

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

Caching-only server

What DNS server normally sends iterative queries to another DNS server? Root name server Caching-only server Forwarder Authoritative source

Forwarder

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

Internet Corporation for Assigned Names and Numbers (ICANN)

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

Less traffic crossing the network perimeter

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

Reducing the traffic and making efficient use of available bandwidth across the network perimeter

What DNS server represents the top of the DNS hierarchy? Root name server Caching-only server Forwarder Authoritative source

Root name server

What are the servers at the top of the DNS hierarchy called? Down-level servers Authoritative sources Root servers Forwarders

Root servers

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

Time To Live (TTL) specified by each DNS server's administrator

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.

To allow a DHCP server to request a DNS server to update or create a record.

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

UDP; 53

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

When a DNS server receives information about a non-existent host

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

hierarchical; periods

The typical query one DNS server sends to a root name server is called a(n) _______. recursive query iterative query referral forwarded query

recursive query

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

subdomains of contoso.com