Module 8 - Configuring and Managing Network Services

The process by which a DHCP client requests IP configuration from a DHCP server involves several stages. Place those stages below in the correct order.

1. DHCPDISCOVER 2. DHCPOFFER 3. DHCPREQUEST 4. DHCPACK

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

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 replication partner* 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.

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 stub zone* 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.

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

AAAA record* 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?

Carlos sets the lease duration to 7 days.* 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.

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?

Clear the DNS Server cache, and clear the DNS cache on the resolver* Radha can resolve this issue by clearing the DNS Server cache and clearing the DNS cache on the resolver.

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

Confirming that the computer has a physical connection to the network* 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.

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.

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.

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

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.

Which of the following is true of WINS?

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

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?

Reservations* 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.

Identify a vital service provided by secondary DNS servers.

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

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?

Some of the resource records for N2001EY will be made available for scavenging after 28 days.* The dynamically updated records for N2001EY will be made available for scavenging after 28 days. The manually created records will not be scavenged.

Felicia is drafting an email to her colleague Rhonda. After Felicia types out the email, she enters the email address [email protected] 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?

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

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?

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

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?

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

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?

The NS record* 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.

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?

The client will contact the Web server with the address 172.6.0.15.* 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.

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?

The organization contains DHCP relay agents in different locations.* 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.

Conditional forwarders are an alternative to stub zones that provide the same functionality.

True*

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

True* It is important to select the correct subnet mask during scope creation as it cannot be modified afterward.

When some computers have incorrect address information, you should check for the presence of unauthorized DHCP servers on the network running a non-Windows operating system and remove them if found.

True* When some computers have incorrect address information, you should check for the presence of unauthorized DHCP servers on the network running a non-Windows operating system and remove them if found.

What does the acronym WINS stand for?

Windows Internet Name Service

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

Zone transfer issues* 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.

The DHCP tool uses ___________ to organize the settings for each IPv4 and IPv6 network that it can provide IP configuration for. (fill in the blank)

scopes*

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?

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