Deck 8: Name Resolution on Ip Networks

Question 1

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

Answer 1

B

Question 2

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

Answer 2

B

Question 3

Which command is an essential tool for testing when configuring or troubleshooting a DNS server?

A)nslookup
B)route
C)netstat
D)dnscmd

Answer 3

A

Question 4

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

Question 5

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.

Question 6

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
D)primary master

Question 7

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.
Indicate the answer choice that best completes the statement or answers the question.

Question 8

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

Question 9

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

Question 10

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

Question 11

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

Question 12

The structure of the DNS database mirrors the structure of the domain namespace itself.

Question 13

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

Question 14

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

Question 15

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

Question 16

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

Question 17

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

Question 18

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

Question 19

The records in which file are provided to support reverse DNS lookups?

A)arpa.addr
B)db.addr
C)cname.addr
D)dns.addr

Question 20

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

Question 21

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
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

Question 22

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
a DNS resource record that's used for inverse lookups to map numeric IP addresses to domain names

Question 23

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
Enter the appropriate word(s) to complete the statement.

Question 24

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
a name resolution protocol used for peer-to-peer network environments and that provides secure and scalable resolution services

Question 25

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
a DNS resource record that maps IPv4 addresses to hosts within a domain

Question 26

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

Question 27

Which type of resource record is used to create aliases?

A)canonical name
B)host information
C)name server
D)pointer

Question 28

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

Question 29

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
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

Question 30

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
a type of server that is used only to cache already resolved domain names and addresses, as well as related error information

Question 31

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.

Question 32

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
containing multiple network interfaces capable of attaching to multiple subnets

Question 33

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

Question 34

Most DNS resolvers issue which of the following from the client side?

A)recursive query
B)address query
C)nslookup
D)name query

Question 35

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

Question 36

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

Question 37

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
a DNS resource record used to define database aliases, primarily to make it quicker and easier to edit and manage DNS zone files

Question 38

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
a protocol that provides name resolution services on local networks for IPv4 and IPv6 Windows computers

Question 39

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.

Question 40

A ____________________ occurs when a secondary server updates its database from the primary domain NS.

Question 41

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?

Question 42

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

Question 43

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

Question 44

Briefly discuss how to use nslookup with IPv6.

Question 45

What are some of the shortcomings of DNS?

Question 46

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

Question 47

What are the advantages of DNS?

Question 48

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

Question 49

What is the purpose of the destination address selection algorithm?

Question 50

Why do some recursive queries involve a root server?