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28 Cards in this Set

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You are the administrator at Lucerne Publishing. You administer the books.lucernepublishing.com Microsoft Windows Server 2003 Active Directory domain. Active Directory–integrated DNS is configured on all domain controllers in the domain. You configure a member server, ServerA, to host an internal Web site for the intranet. You want employees to access this Web site using the URL books.internal.lucernepublishing.com. What should you do?


a. Create a CNAME resource record called books, and specify internal.lucernepublishing.com as the target host.
b. Create a new zone called internal.lucernepublishing.com. Create a CNAME resource record called books in that new zone, and specify ServerA.books.lucernepublishing.com as the target host.
c. Create a CNAME resource record called books.internal, and specify ServerA.books.lucernepublishing.com as the target host.
d. Create a CNAME resource record called internal, and specify ServerA.books.lucernepublishing.com as the target host.
b. Create a new zone called internal.lucernepublishing.com. Create a CNAME resource record called books in that new zone, and specify ServerA.books.lucernepublishing.com as the target host.


EXPLANATION: This new zone would map books.internal.lucernepublishing.com to serverA.books.lucernepublishing.com. The new zone can be either standard primary or Active Directory–integrated.
You are an administrator for a complex Microsoft Windows Server 2003 network that has several DNS servers. Your network performance has degraded, and you are concerned because most of your business is done over the Internet. You surmise that DNS traffic is part of the problem. How can you reduce DNS traffic on your network?

a. Create a forwarding, or forward-only, server.
b. Upgrade all Microsoft Windows NT 4 clients to Microsoft Windows XP.
c. Configure your DNS server to perform only recursive queries.
d. Add a WINS server to your network.
a. Create a forwarding, or forward-only, server.

EXPLANATION: Forwarding-only servers can be configured to handle all forwarding for the network, eliminating the need for each DNS server to perform forwarding. The forwarding server maintains the DNS caches, which reduces the number of queries.
Host name resolution on a Microsoft Windows Server 2003 network uses DNS to map which two items to one another?


a. Host name to IP address
b. FQDN to MAC address
c. Host name to MAC address
d. FQDN to IP address
d. FQDN to IP address

EXPLANATION: (Discussion starts on page 62.)
Host computers typically use iterative queries.


a. True
b. False
b. False

EXPLANATION: Host computers typically request recursive queries.
Your company uses a Microsoft Windows Server 2003 network that runs DNS. You would like to improve name resolution, but you do not want to increase replication traffic. What can you do to accomplish this?


a. Add an additional primary name server
b. Add an additional secondary name server
c. Add a caching-only name server
d. Add a WINS server
c. Add a caching-only name server

EXPLANATION: Caching-only DNS servers can improve performance by responding to client queries. Because caching-only name servers do not hold a copy of the zone file, there is not an increase in replication.
Your Microsoft Windows Server 2003 network has one primary DNS server and two secondary DNS servers. Several changes are made to the zone database on the primary server. How will the secondary DNS servers learn about the changes to the primary server’s zone database?


a. The master server will notify the secondary servers of zone changes.
b. The update will occur only when the zone refresh interval expires.
c. The DNS Server service is restarted on a secondary server.
d. A zone transfer is manually initiated on the secondary servers.
e. A zone transfer is automatically initiated every 60 minutes.
a. The master server will notify the secondary servers of zone changes.

EXPLANATION: When a primary server receives updates to the zone file, it notifies the secondary servers that it has changes. The secondary servers then request a zone transfer. (Discussion starts on page 89.)
To perform a recursive query, the DNS server must have the location of the root level DNS servers. By default, Microsoft Windows Server 2003 stores the root hints in which file?


a. Root.dns
b. Roothints.dns
c. Forwarders.dns
d. Cache.dns
d. Cache.dns


EXPLANATION: By default, Windows Server 2003 stores root hints in the Cache.dns file, which is located at %systemroot%\System32\Dns.
What are the four types of standard DNS zones?
a. Standard primary
b. Stub
c. Standard secondary
d. Active Directory–integrated
e. in-addr.arpa
a. Standard primary
b. Stub
c. Standard secondary
e. in-addr.arpa

Correct answer: a, b, c, and e
EXPLANATION: A standard primary zone contains a read/write copy of the DNS database. A stub zone contains only the records necessary to identify the DNS server that is authoritative for the domain. A standard secondary zone contains a read-only copy of the database. An in-addr.arpa zone is used to perform reverse lookups.
When a DNS server that is configured to perform recursive queries cannot resolve a name or is not authoritative for the namespace, it must contact a higher-level DNS server. What will the DNS server use to locate DNS servers that are higher in the DNS hierarchy?


a. Root hints
b. WINS
c. SMTP
d. Recursion
a. Root hints

EXPLANATION: DNS servers must be configured with root hints to resolve a name for which they are not authoritative.
When you install Microsoft Windows Server 2003, DNS is installed automatically.


a. True
b. False
b. False

EXPLANATION: DNS is not installed by default when you install Windows Server 2003. It can be installed through the Configure My Server page and through Add And Remove Programs in Control Panel.
Microsoft Windows Server 2003 supports two types of zone transfers: IXFR and AXFR. Which statements best describe each of these transfers? Choose two answers.
a. IXFR is an incremental zone transfer.
b. IXFR is a full zone transfer.
c. AXFR is an incremental zone transfer.
d. AXFR is a full zone transfer.
a. IXFR is an incremental zone transfer
d. AXFR is a full zone transfer.

Correct answer: a and d
EXPLANATION: When a master server receives a request for a zone transfer, it can respond with an IXFR incremental zone transfer or an AXFR full zone transfer.
When a client queries a DNS server and requests the best answer that the DNS server can provide using only its own database, which type of query has been performed?

a. Recursive
b. Standard
c. Iterative
d. Secondary
c. Iterative


EXPLANATION: (Discussion starts on page 82.)
You are a network administrator for a Microsoft Windows Server 2003 network. To improve performance, you would like to reduce iterative queries by specifying where your DNS server forwards queries. What should you do to accomplish this?


a. Configure standard forwarders with the address of the DNS servers to which requests should be forwarded.
b. Configure root hints pointing to the domains you want to resolve.
c. Configure conditional forwarding with the addresses of the DNS servers to which requests should be forwarded.
d. This cannot be accomplished
c. Configure conditional forwarding with the addresses of the DNS servers to which requests should be forwarded.

EXPLANATION: Conditional forwarding allows a DNS server to forward a request to other DNS servers based on the domain name in the query.
Which type of DNS server does not contain a copy of a zone file but is capable of responding to client queries?


a. Primary name server
b. Secondary name server
c. Master name server
d. Caching-only name server
d. Caching-only name server

EXPLANATION: Caching-only name servers do not contain a copy of the zone file, but they do contain a cache file based on the queries that are resolved by other DNS servers. If the cache file contains the information necessary to answer a client’s query, the caching-only server will respond.
You discover that an administrator has adjusted the default Time To Live (TTL) value for your company’s primary DNS zone to 5 minutes. Which of the following is the most likely effect of this change?


a. Resource records cached on the primary DNS server expire after 5 minutes.
b. DNS clients have to query the server more frequently to resolve names for which the server is authoritative.
c. Secondary servers initiate a zone transfer every 5 minutes.
d. DNS hosts reregister their records more frequently.
b. DNS clients have to query the server more frequently to resolve names for which the server is authoritative.

EXPLANATION: The Time to Live (TTL) resource record field specifies the maximum time, in seconds, that a DNS server or client caches this resource record before it is discarded. This field is optional, and if it is not specified, the client uses the minimum TTL in the start of authority (SOA) record, which by default is 60 minutes.
Internet namespace has a hierarchical structure with the root domain located at the top of the structure. What is used to represent the root domain?

a. .com
b. .edu
c. .net
d. dot (.)
d. dot (.)

EXPLANATION: The root level domain is represented by a dot (.). The domains .com, .edu, and .net represent top-level domains.
You administer a private Microsoft Windows Server 2003 network that has a standard primary DNS server and a standard secondary DNS server. Both servers are used to resolve internal DNS names. Your network has an external DNS server that is separated from the internal network by a firewall. Internal users complain that they cannot resolve names on the Internet. What should you do to resolve this problem?


a. Edit the Cache.dns file.
b. Configure the internal DNS servers to forward requests to the external DNS server.
c. Remove the firewall.
d. Configure a PTR record to the external DNS server on the internal DNS servers.
b. Configure the internal DNS servers to forward requests to the external DNS server.

EXPLANATION: Configuring internal DNS servers to forward queries to an external DNS server solves this problem. Forwarders provide a method to manage name resolution for names outside of your network.
You must configure DNS to hide detailed information about your network but to still provide name resolution and access to your resources. What step can you take to accomplish this?


a. Disable DNS and use WINS.
b. Delete the DNS database and create a host file on all domain controllers.
c. Use CNAME records in DNS to hide the identity of resources.
d. DNS cannot hide the identity of network resources.
c. Use CNAME records in DNS to hide the identity of resources.

EXPLANATION: A canonical name, or CNAME, resource record creates an alias for a fully qualified domain name (FQDN) and can be used to hide specific details about your network.
You are the administrator of a Microsoft Windows Server 2003 domain. Your domain has three DNS servers, which are located on domain controllers. Currently, you can create updates on only one of the DNS servers. You would like to be able to make changes to the DNS database on any of the three DNS servers, and you want these changes to replicate to all other DNS servers in your domain. You should make which configuration change?


a. Convert all DNS servers to primary DNS servers.
b. Convert all DNS server zones to Active Directory–integrated zones.
c. This cannot be accomplished.
d. Create forwarding entries on the DNS servers with secondary zone files.
b. Convert all DNS server zones to Active Directory–integrated zones.


EXPLANATION: Active Directory–integrated zones use multimaster replication, which allows updates to the DNS database at any domain controller.
You are the administrator of a network that has three Microsoft Windows Server 2003 domain controllers and one Microsoft Windows NT 4 member server named Server Four. One of the Windows Server 2003 domain controllers hosts the primary DNS zone, and the Windows NT 4 member server acts as a secondary DNS server. You would like to convert your DNS structure to include only Active Directory–integrated zones. What step must you take to accomplish this?

a. Open the DHCP console on each server and choose Active Directory–Integrated for the zone type.
b. Delete the primary and secondary DNS zone files and reinstall DNS.
c. Upgrade the Windows NT 4 member server to a Windows Server 2003 domain controller.
d. The zone type cannot be changed.
c. Upgrade the Windows NT 4 member server to a Windows Server 2003 domain controller.

EXPLANATION: Active Directory–integrated zones use Active Directory directory service to replicate DNS zone information. A Windows NT 4 server cannot run Active Directory.
A Microsoft Windows Server 2003 domain that utilizes an Active Directory–integrated DNS zone can have a secondary DNS server running on a member server.

a. True
b. False
a. True

EXPLANATION: Windows Server 2003 supports sending a copy of the DNS zone file to a secondary server when using Active Directory–integrated zones.
A host must communicate with a server on the same network. The host has the IP address of the server. What process will DNS use to obtain the name of the server?

a. Standard lookup
b. Forward lookup
c. Reverse lookup
d. Inverse lookup
c. Reverse lookup

EXPLANATION: An in-addr.arpa zone is used to resolve a host name from a given IP address. This is known as a reverse lookup.
While viewing your DNS database, you see the following resource record:
na.contoso.com. IN NS nadcl.na.contoso.com.
What is the purpose of this resource record?

a. To identify a name server
b. To identify an Internet server
c. To identify an individual host
d. To identify an entire domain
a. To identify a name server

EXPLANATION: Resource records that begin with the syntax (na.) are used to identify the name server or DNS server that is authoritative for a zone.
Your Microsoft Windows Server 2003 network is running DNS. The network has a DNS server with a standard primary zone and two DNS servers hosting standard secondary zones. You must make a manual entry in the DNS database, and you would like this entry to replicate to all other DNS servers on the network. You must make the entry on which DNS server?

a. You can make the entry on any of the DNS servers.
b. You can make the entry on one of the servers that hosts a standard secondary DNS zone.
c. You can make the entry on only the server that hosts the primary DNS zone.
d. The update must be made on both secondary servers.
c. You can make the entry on only the server that hosts the primary DNS zone.

EXPLANATION: With standard DNS zones, the primary server has a read/write copy of the database and the secondary servers have read-only copies. All updates must be made on the primary server.
For communication to exist on a TCP/IP network using DNS, each host must be identified by a resource record in the DNS database. Which type of DNS resource record is used to identify individual hosts?

a. PTR records
b. A records
c. NS records
d. SOA records
b. A records

EXPLANATION: Individual host records in DNS are called A, or host, records.
A ____ record is the A record in the parent zone for an authoritative DNS server hosting the child zone for the delegated subdomain.


a. Glue
b. PTR
c. SOA
d. Host
a. Glue

EXPLANATION: Delegation and glue records are resource records that you add to a zone to delegate a subdomain to a separate zone hosted on another DNS server.
Which type of DNS server contains a copy of the zone file and can respond to client queries but cannot be directly updated?

a. Primary name server
b. Secondary name server
c. Master name server
d. Caching-only name server
b. Secondary name server

EXPLANATION: Secondary DNS servers contain a read-only copy of the DNS database. All updates must be done on the primary DNS servers. Secondary name servers will respond to client queries.
DNS servers perform iterative queries in the process of completing a recursive query. What do the DNS servers do with the information learned from the iterative queries?


a. The information is discarded.
b. The information is sent to the client to use with the next query.
c. The DNS server caches the information for use with future queries.
d. The information is used to update the Cache.dns file.
c. The DNS server caches the information for use with future queries.

EXPLANATION: DNS servers cache learned information in iterative queries. This information is used with future queries.