Server 1 Chapter 8

Malia configures a primary zone on a DNS server to accept dynamic updates. Whenever a computer is added to the network, resource records for the computer are automatically created. For a computer, NX2001EY, Malia configures resource records manually. On the Zone Aging/Scavenging Properties window, she selects Scavenge stale resource records, sets the No-refresh interval to 14 days, and sets the Refresh interval to 14 days. She also enables automatic scavenging in the DNS server’s properties.

 

If Malia removes NX2001EY from the network, what is the most likely outcome in this scenario?

 

 

• A. All the resource records for N2001EY will be made available for scavenging after 28 days.

• B. Some of the resource records for N2001EY will be made available for scavenging after 28 days.

• C. Malia will need to manually remove all the resource records for N20001EY.

• D. The resource records for N2001EY will be deleted within 14 days.

B.

The dynamically updated records for N2001EY will be made available for scavenging after 28 days. The manually created records will not be scavenged.

Danielle creates a new scope, Sales LAN, for a DHCP server in her organization. She wants to assign an IP address to a printer in the sales department.

 

Which of the following folders should Danielle use to configure this option?

 

 

• A. Reservations

• B. Address Leases

• C. Policies 

• D. Address Pool

A.

Reservations allow you to provide the same IP address each time a DHCPDISCOVER is received from a DHCP client that has a certain MAC address. Reservations are often created for network-attached printers, servers, and network devices that must receive an IP address from a DHCP server that does not change over time.

Felicia is drafting an email to her colleague Rhonda. After Felicia types out the email, she enters the email address [e-mail] and clicks Send. Felicia’s email server uses the email address typed to locate the recipient email server.

 

Which DNS resource record for zoneA.com allows Felicia’s email server to locate the recipient email server?

 

 

• A. The CNAME record

• B. The A record

• C. The AAAA record

• D. The MX record

D.

When Felicia sends the email, her email server locates the target email server by resolving the MX record for zoneA.com.

You are investigating strange traffic on your network and wish to resolve an IP address to a DNS name.

 

What resource record should you use to perform a reverse lookup?

 

 

• A. An A record

• B. A PTR record

• C. An AAAA record

• D. A CNAME record

B.

A PTR record resolves an IP address to an FQDN. This is the record that you need to use to perform a reverse lookup.

Raymond and Lin are facing network issues on their computers. Rayna, the administrator, is troubleshooting the issue. She notices that Raymond and Lin’s computers are using the same IP address, 192.167.1.85.

 

If the organization’s network uses a DHCP server, which of the following most likely caused this issue?

 

 

• A. The IP addresses were configured by the DHCP server. 

• B. The IP addresses on both computers have expired.

• C. The IP addresses were configured automatically.

• D. The IP addresses were configured manually.

D.

This is the most likely cause of failure. Rayna or another system administrator may have accidentally configured both computers with the same IP address.

Which of the following is true of WINS?

​

 

• A. If NetBIOS is enabled, a WINS server does not need to be installed on the network.

• B. It can only resolve NetBIOS names to IPv4 addresses.

• C. If a computer is configured to use WINS, it resolves NetBIOS names using broadcasts.

• D. It is enabled by default on all Windows Server systems.

B.

WINS can only be used to resolve NetBIOS names to IPv4 addresses.

What resource record type defines an IPv6 host address in DNS?

 

 

• A. CNAME record

• B. PTR

• C. A record

• D. AAAA record

D.

An AAAA record resolves an FQDN to an IPv6 address.

Carlos is configuring a DHCP server in his organization. Some of the computers in his organization contain manually configured IP addresses. Currently, he is setting up the new server to configure IP addresses for users who operate their mobile devices on the organization’s network.

 

Which of the following decisions should Carlos reevaluate?

 

 

• A. Carlos sets the lease duration to 7 days.

• B. Carlos provides a subnet delay of 100 milliseconds.

• C. Carlos sets the subnet mask as 255.255.255.0.

• D. Carlos excludes certain IP addresses.

A.

Carlos should reevaluate his decision to set the lease duration to 7 days. A lease time of 7 days is appropriate for most networks that contain desktop PCs, but he should lower the lease time on networks that provide IP address configuration for mobile devices.

Identify a vital service provided by secondary DNS servers.

 

 

• A. Secondary DNS servers contain read-write copies of a primary DNS server's data.

• B. Secondary DNS servers respond to DNS lookup requests using read-only zone files.

• C. Secondary DNS servers divert all traffic to primary DNS servers to reduce load.

• D. Secondary DNS servers improve security by preventing access to primary DNS servers.

B.

Secondary DNS servers contain a read-only copy of the zone file from the primary DNS server that they can use to respond to DNS lookup requests.

Reno is facing some DNS server issues that he is unable to resolve using nslookup, DNS manager, and other general methods. He decides to use information from the DNS Server log to identify the issue. However, the information that was logged is insufficient to resolve the issue. Reno is able to identify the issue after enabling debug logging.

 

What should Reno do next?

 

 

• A. Reno should turn off debug logging.

• B. Reno should delete all the log files.

• C. Reno should flush the DNS server cache.

• D. Reno should permanently enable debug logging.

A.

Once the issue is resolved, Reno should turn off debug logging because debug logging records a large amount of information in the log file.

Leisl configures multiple WINS servers on her organization’s network. She wants the WINS servers to be able to share the NetBIOS records with each other.

 

Which of the following features should Leisl use?

 

 

• A. A replication partner

• B. Nslookup

• C. Debug logging

• D. A stub zone

A.

Leisl needs to use the replication partner feature. If multiple WINS servers are deployed on the network, you can configure them to share their NetBIOS name records. In this case, each WINS server is called a replication partner and can resolve all of the NetBIOS names in the organization.

The subnet mask cannot be modified once a scope is created. 

True

False

True

What is the first step in troubleshooting an issue where a single computer is unable to lease an address?

 

 

• A. Ensuring that the DHCP service is running

• B. Verifying that the DHCP server is authorized

• C. Checking if the computer was manually configured with an IP address

• D. Confirming that the computer has a physical connection to the network

D.

When a single computer is unable to lease an address, the first troubleshooting step is to confirm that the computer has a physical connection to the network.

If there are multiple DHCP servers on a network, DHCP clients will accept the first offer that they receive. 

True

False

False

If there are multiple DHCP servers on your network, DHCP clients will accept the first offer that they receive and decline all other offers by sending a DHCPDECLINE packet to the other DHCP servers.

Kaya is an administrator at Kelvin Computing. Benjamin, a user, wants to access a shared folder on SERVERA, so he uses the UNC \\servera\share to access the folder. His computer then sends out a broadcast to the network to resolve the name SERVERA. Because of the broadcast, all computers on the LAN interpret it and causes additional processing that interferes with other operations.

 

What can Kaya do to avoid this additional overhead?

 

 

• A. Configure a default forwarder

• B. Install a WINS server

• C. Configure a conditional forwarder

• D. Restart the DNS Server

B.

Kaya should install Windows Internet Name Service (WINS) servers to provide centralized NetBIOS name resolution that does not use broadcasts.

You are troubleshooting a DHCP server and discover that it is not dynamically updating DNS records for DHCP clients.

 

What is the most likely cause for this issue?

 

 

• A. The network contains computers with manually configured IP addresses.

• B. The DNS server is an authoritative, primary DNS server.

• C. The DNS server and DHCP server are in different domains.

• D. The DNS server and DHCP server are running on different operating systems.

C.

The most likely cause for this issue is that that DNS server and DHCP server are in different domains.

Tuyet types the following statement into File Explorer: \\serverA\Share1. The NetBIOS name is resolved by a WINS server, and Tuyet is able to access the shared folder. After this interaction with the WINS server, Tuyet does not perform any other operations that requires her computer to interact with the WINS server for over a week.

 

Which of the following is true of this scenario?

 

 

• A. Tuyet is using a Windows XP computer or another legacy operating system.

• B. The WINS server will automatically shut down because of inactivity. 

• C. Tuyet’s computer’s name record will be deleted from the WINS server.

• D. The NetBIOS name is first broadcast over the LAN to all the computers.

C.

If your computer does not contact a WINS server within 6 days, your NetBIOS name record is automatically removed from the WINS server.

Aspen sets up the round robin feature in DNS for an FQDN server, server.domainA.com. She creates two identical Web servers with IP addresses 192.168.1.75 and 172.6.0.15 and associates two A records on the FQDN server with these IP addresses. The first A record is associated with the Web server having the IP address 192.168.1.75, and the second A record is associated with the Web server having the IP address 172.6.0.15. Aspen uses a client with the IP address 172.6.0.95 to perform a forward lookup of server.domainA.com.

 

Which of the following is true of this scenario?

 

 

• A. The client will contact the Web server with the address 172.6.0.15.

• B. The FQDN server will return one of the IP addresses because of the round robin feature setup.

• C. The client will contact the Web server with the address 192.168.1.75.

• D. The FQDN server will return both IP addresses, 192.168.1.75 followed by 172.6.0.15.

A.

The FQDN server will return both IP addresses in the order 172.6.0.15 followed by 192.168.1.75, so the client will contact 172.6.0.15. This is because netmask ordering ensures that the IP address that most closely resembles the client’s IP address is returned first.

You are the administrator for an Active Directory domain and have been tasked with improving the response time for resolving DNS queries for resources in a second company-owned domain that does not use Active Directory.

 

What type of zone can be used to accomplish this task with minimal overhead?

 

 

• A. A forward zone

• B. A reverse zone

• C. A stub zone 

• D. A glue zone

C.

Stub zones contain NS and host records that allow a DNS server to access an authoritative zone on another DNS server. Creating a stub zone involves the least overhead.

Christopher sets up multiple WINS servers in his organization and configures users’ computers to use the WINS server. During testing, he attempts to access a folder called Share on the computer SERVERA. He enters the following statement into File Explorer: \\serverA\share. However, Christopher is unable to access the shared folder.

 

What is the most likely reason for this issue?

 

 

• A. Christopher has not set up replication.

• B. The UNC syntax entered is incorrect and is missing arguments. 

• C. SERVERA does not have a NetBIOS name record on any WINS server.

• D. The user computer is connect to the LAN but not to the Internet.

C.

Although Christopher has set up other users’ computers to use the WINS servers, it is likely that SERVERA does not have a NetBIOS name record on the WINS servers.

Michelle is configuring a DHCP server in her organization. When creating a new scope, she is prompted to enter the subnet delay. She chooses to enter a few milliseconds of delay.

 

If true, which of the following would justify this choice?

 

 

• A. The organization contains computers with manually configured IP addresses.

• B. The network contains DHCP servers configured in a DHCP failover configuration.

• C. The network contains other DHCP servers that lease IP addresses.

• D. The organization contains DHCP relay agents in different locations.

D.

In this scenario, the presence of DHCP relay agents in different locations is likely to influence Michelle’s choice. By default, DHCPOFFER packets are provided immediately by a DHCP server following the receipt of a DHCPDISCOVER packet, but you can provide a short delay should this cause problems with the DHCP relay agents in your organization.

Which of the following is the most likely cause for missing resource records in a secondary zone?

 

 

• A. Manual DNS cache flushing 

• B. Zones that allow dynamic updates

• C. An invalid entry in the DNS cache

• D. Zone transfer issues

D.

Missing resource records in a secondary zone are often caused by zone transfer issues. Zone transfers may not occur successfully if the network bandwidth is saturated at the time the zone transfer was initiated.

Lashonda sets up a DNS server, SERVER1, with a forward lookup zone called domainA.com. It hosts the resource records for the domainX.com Active Directory domain. It contains host (A) records for two network interfaces on SERVER1 (172.16.0.10 and 192.168.1.50). The host records are associated with the FQDNs server1.domainA.com and domainA.com. There is also an SOA record and an NS record for the zone.

 

Which of the following records identifies SERVER1 as an authoritative DNS server?

 

 

• A. The A record for 192.168.1.50

• B. The A record for 172.16.0.10

• C. The NS record 

• D. The SOA record

C.

An NS record is used to identify a DNS server that is authoritative for a zone. In this scenario, the NS record identifies SERVER1 as an authoritative DNS server.

For zones that allow dynamic updates, you do not need to create CNAME and MX records or host records that provide for round robin or netmask ordering. 

True

False

False

After creating a forward or reverse lookup zone, you can manually create resource records in a zone. For zones that allow dynamic updates, you still need to manually create CNAME and MX records as well as host records that provide for round robin or netmask ordering.

Which of the following organizations does not need to install a WINS server?

 

 

• A. An organization that has DNS servers installed

• B. An organization that uses modern operating systems such as Windows 10

• C. An organization that uses shared folders on computers with NetBIOS names

• D. An organization that has disabled NetBIOS on its computers 

D.

While NetBIOS is enabled by default on all Windows systems, some organizations choose to disable it on each computer. These organizations rely entirely on DNS name resolution and do not require a WINS server as a result.

Radha is using nslookup to troubleshoot DNS-related issues on SERVER1. She uses the command prompt and types in the statement nslookup servery.zone1.com. SERVER1 returns an incorrect result.

 

If SERVER1 is non-authoritative for this lookup, what should Radha do to resolve this issue?

 

 

• A. Ensure that the configuration of any stub zones is correct

• B. Clear the DNS Server cache, and clear the DNS cache on the resolver

• C. Configure the IP address of the correct DNS server in network interface properties on the resolver

• D. Modify the associated records in the zone on SERVER1 to include the correct information

B.

Radha can resolve this issue by clearing the DNS Server cache and clearing the DNS cache on the resolver.