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chapter 8
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Indicate whether the statement is true or false.
1. 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.
a.
True
b.
False
2. 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.
a.
True
b.
False
3. The structure of the DNS database mirrors the structure of the domain namespace itself.
a.
True
b.
False
4. Domains (such as ibm.com) can be broken into subdomains (such as clearlake.ibm.com), as needed.
a.
True
b.
False
5. Not all the data in a DNS cache has an expiration value.
a.
True
b.
False
Indicate the answer choice that best completes the statement or answers the question.
6. Which of the following processes permits a DNS server to keep track of which IP addresses it has provided
most recently for a specific translation and to rotate the IP addresses within the pool?
a.
IP spoofing
b.
name resolution
c.
FQDN
d.
DNS round robin
7. Which command is an essential tool for testing when configuring or troubleshooting a DNS server?
a.
nslookup
b.
route
c.
netstat
d.
dnscmd
8. The records in which file are provided to support reverse DNS lookups?
a.
arpa.addr
b.
db.addr
c.
cname.addr
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d.
dns.addr
9. Which type of resource record is used to create aliases?
a.
canonical name
b.
host information
c.
name server
d.
pointer
10. Which process provides a mechanism whereby DNS 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
11. When one DNS server receives a recursive request, that DNS server issues which of the following 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
12. What are the files called that map addresses to domain names for reverse lookups?
a.
addr.in-addr.arpa.dns
b.
domain.dns
c.
tree.dn
d.
clearlake.dns
13. What type of servers are used to 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
14. 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 which of the following?
a.
hosts
b.
resource records
c.
zones
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d.
primary master
15. Which resource 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
16. Most DNS resolvers issue which of the following from the client side?
a.
recursive query
b.
address query
c.
nslookup
d.
name query
17. Which type of resource 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
18. Which of the following 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
19. Which type of request will 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
20. Which 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
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21. An application or service that encounters a domain name for which it needs an IP address is known as which
of the following?
a.
address request
b.
TCP/IP client
c.
caching server
d.
DNS client
22. Which of the following resource records 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
23. DNS servers cache name and address pairs for addresses they resolved, and they keep information about
name requests that result in error messages. What is this information called?
a.
DNS round robin
b.
name resolution
c.
negative caching
d.
IP spoofing
24. What type of query is known as 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
25. It is important to understand that the zone data on a secondary server always originates from which type of
server?
a.
caching
b.
incremental
c.
name
d.
primary
26. Which command is used to show active TCP connections, listening ports, Ethernet statistics, IPv4 statistics,
and IPv6 statistics
a.
nslookup
b.
route
c.
netstat
d.
dnscmd
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Enter the appropriate word(s) to complete the statement.
27. A(n) ____________________ gets its data for the zone from the master server for that zone.
28. 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.
29. A name query seeks to resolve an address to a domain name, and is also known as a(n)
____________________.
30. 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.
31. A ____________________ occurs when a secondary server updates its database from the primary domain
NS.
Match each item with a statement below.
a.
A record
b.
Link-Local Multicast Name Resolution (LLMNR)
c.
Peer Name Resolution Protocol (PNRP)
d.
caching-only server
e.
CNAME record
f.
SOA record
g.
delegation of authority
h.
multihomed
i.
pointer record
32. a DNS resource record that maps IPv4 addresses to hosts within a domain
33. a protocol that provides name resolution services on local networks for IPv4 and IPv6 Windows computers
34. a name resolution protocol used for peer-to-peer network environments and that provides secure and
scalable resolution services
35. a type of server that is used only to cache already resolved domain names and addresses, as well as related
error information
36. a DNS resource record used to define database aliases, primarily to make it quicker and easier to edit and
manage DNS zone files
37. A DNS resource record that identifies the server or servers that are authoritative for the domain or
subdomain to which the zone files or database correspond
38. the principle whereby one name server designates another name server to handle some or all of the zone files
for the domain or subdomains under its purview
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39. containing multiple network interfaces capable of attaching to multiple subnets
40. a DNS resource record that's used for inverse lookups to map numeric IP addresses to domain names
41. What is the purpose of the destination address selection algorithm?
42. Why do some recursive queries involve a root server?
43. Provide a high-level description of the address selection process from end-to-end.
44. What are some of the shortcomings of DNS?
45. What is the difference between a recursive query and an iterative query?
46. What are some of the disadvantages of a round robin DNS?
47. Briefly define six of the nine most commonly used resource record types.
48. 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?
49. What are the advantages of DNS?
50. Briefly discuss how to use nslookup with IPv6.
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Answer Key
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