Deploying IPv6 | Ch11 Test Bank – 4th Edition

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Chapter 8: Name Resolution on IP Networks

Student: ___________________________________________________________________________

1. The structure of the DNS database mirrors the structure of the domain namespace itself. 
True    False

2. Twenty-six root name servers (named A.ROOT-SERVERS.NET., B.ROOT-SERVERS.NET., etc.) act as the top of the DNS hierarchy worldwide. They provide the ultimate source for all name lookups that cannot be resolved through other means. 
True    False

3. Domains (such as ibm.com) can be broken into subdomains (such as clearlake.ibm.com), as needed. 
True    False

 When a TCP/IP client uses a resolver to send a name query to a DNS server, that client obtains the address for the DNS server it queries from its TCP/IP configuration data. 
True    False

 Not all the data in a DNS cache has an expiration value. 
True    False

 By ____ DNS data from one or more database segments on one or more DNS servers, DNS also provides a mechanism whereby it can attempt to satisfy name resolution requests locally before attempting them remotely, thereby greatly improving the speed of such name resolution. 
A. transferring
B. caching
C. resolving
D. spoofing

 Data associated with domain names, address records, and other specific data of interest to the Domain Name System is stored on a DNS server in special database records called ____. 
A. hosts
B. resource records
C. zones
D. primary master

 A ____ record is used to create aliases. 
A. canonical name
B. mail exchange
C. name server
D. pointer

 A ____ record is used to route SMTP-based e-mail on the Internet and identify the IP address for a domain’s master e-mail server. 
A. canonical name
B. mail exchange
C. name server
D. pointer

 A(n) ____ record stores IP address-to-domain name translation data and supports the operation known as a reverse DNS lookup. 
A. well-known services
B. text
C. pointer
D. host information

 A(n) ____ record lists the IP-based services, such as Telnet, FTP, HTTP, and so forth, that an Internet host can supply. 
A. well-known services
B. text
C. name server
D. host information

 A(n) ____ record may be used to add arbitrary text information to a DNS database, usually for documentation. 
A. well-known services
B. text
C. pointer
D. host information

 ____ store recently accessed DNS records from other domains to avoid incurring the performance overhead involved in making a remote query each time a resource outside the local domain is accessed. 
A. Name resolvers
B. Primary DNS servers
C. Subdomains
D. Caching servers

 It is important to understand that the zone data on a secondary server always originates from a(n) ____ server. 
A. caching
B. incremental
C. name
D. primary

 A(n) ____ is usually some application or service that encounters a domain name for which it needs an IP address. 
A. address request
B. TCP/IP client
C. caching server
D. DNS client

 Most DNS resolvers issue what is called a(n) ____from the client side. 
A. recursive query
B. address query
C. nslookup
D. name query

 A ____ is a query that keeps working until an answer of some kind is forthcoming. 
A. domain query
B. reverse query
C. recursive query
D. NSLOOKUP query

 When one DNS server receives a recursive request, that DNS server issues what are called ____ to the name servers in its hierarchy, or to servers provided as pointers in reply to earlier requests, until an answer is received. 
A. caching queries
B. address queries
C. domain queries
D. iterative queries

 ____ requests always go to the name server that is authoritative for the domain that contains the requested name or address to make completely sure data is obtained directly from the source. 
A. Root server
B. Client server
C. Mail server
D. Cache server

 DNS servers cache name and address pairs for addresses they resolved, and they keep information about name requests that result in error messages. This kind of information is called ____. 
A. DNS round robin
B. name resolution
C. negative caching
D. IP spoofing

 Files that map addresses to domain names for reverse lookups are usually called ____. 
A. addr.in-addr.arpa.dns
B. domain.dns
C. tree.dn
D. clearlake.dns

 Configuring how a DNS server responds to requests for name-to-address resolution where one domain name corresponds to multiple IP addresses sits at the heart of a technique called ____. 
A. IP spoofing
B. name resolution
C. FQDN
D. DNS round robin

 The records in the ____file are provided to support reverse DNS lookups. 
A. arpa.addr
B. db.addr
C. cname.addr
D. dns.addr

 DNS ____ is responsible for initiating and sequencing DNS queries that result in name resolution for an application running on the computer. 
A. name resolver
B. subdomain
C. primary master
D. caching server

 By default, ____ queries the default name server specified in the current machine’s TCP/IP configuration. 
A. nslookup
B. mail exchange
C. multi-homed
D. IP

 The ____ command provides access to all kinds of DNS information, either from the current default server, or from a server whose name or IP address you provide as an argument to this command. 
A. nslookup
B. mail exchange
C. multi-homed
D. IP

 The ____________________ is distinguished from other name servers for a domain by its ability to always read its data from a zone file on disk when the DNS service starts up. 
________________________________________

 A(n) ____________________ gets its data for the zone from the master server for that zone. 
________________________________________

 ____________________ DNS servers are important because they provide a back-up copy of the domain database for a specific zone. 
________________________________________

 A(n) ____________________ seeks to resolve a domain name to a corresponding numeric IP address: it simply provides a symbolic domain name, and expects a numeric IP address in return. 
________________________________________

 A name query seeks to resolve an address to a domain name, and is also known as a(n) ____________________. 
________________________________________

 Match each item with a statement below. 

 What are the advantages of DNS? 

 Briefly define six of the nine most commonly used resource record types. 

 What is the difference between a recursive query and an iterative query? 

 Why do some recursive queries involve a root server? 

 What are some of the disadvantages of a round robin DNS? 

 What is the purpose of the destination address selection algorithm? 

 Provide a high-level description of the address selection process from end-to-end. 

 Resolvers interpret responses from the name servers that they query, regardless of whether those responses contain resource record data or error messages. What are the possible causes of these errors? 

 What are some of the shortcomings of DNS? 

 Briefly discuss how to use nslookup with IPv6. 

Chapter 8: Name Resolution on IP Networks