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Configuring Name Resolution
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In an Active Directory environment, DHCP clients update their own PTR records. To force an update, you can run either the Ipconfig /registerdns or the Ipconfig /renew commands. For such an update to succeed, the Use This Connection s DNS Suffix In DNS Registration setting must be enabled. (To enable this setting, you must first enable the Register This Connection s Addresses In DNS setting.) Finally, for a PTR record to be updated successfully in an AD DS environment, the client s preferred DNS server must host appropriately configured forward and reverse lookup zones.
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Using Group Policy to register connection-specific names
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You can use Group Policy to force computers on a network to register connection-specific DNS names. In a GPO, navigate to Computer Configuration\Policies\Administrative Templates\Network \DNS Client. Search for the policy setting named Register DNS Records With Connection-specific DNS Suffix and configure the setting as Enabled.
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To force a DNS client to attempt dynamic registration of its resource records, type ipconfig /registerdns at a command prompt.
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By default, does a client with a domain name assigned by DHCP attempt to register its address in DNS
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Quick Check Answer No.
Viewing and Clearing the DNS Client Cache
The DNS client cache, also known as the DNS resolver cache, is maintained on all DNS clients. DNS clients check this resolver cache before they attempt to query a DNS server. New entries are added to the resolver cache whenever a DNS client receives a query response from a DNS server.
Lesson 3: Configuring DNS Client Settings
To view the DNS client cache, type ipconfig /displaydns at a command prompt. The output of this command includes any entries loaded from the local Hosts file, as well as any recently obtained resource records for name queries resolved by the system. To clear the DNS client cache, you can type ipconfig /flushdns at the command prompt. Alternatively, you can restart the DNS Client service by using the Services console, which is an administrative tool accessible through the Start menu. Exam Tip For the exam, remember that you sometimes need to run Ipconfig /flushdns on your computer before you can see the benefit of having fixed a DNS problem elsewhere on the network. For example, if a Windows client has cached a negative response from a DNS server to an earlier query, the client will continue to receive a negative response even if the DNS server can now resolve the query. To fix such a problem, flush the DNS client cache by executing Ipconfig /flushdns on the Windows computer. This command forces the Windows client to contact the DNS server again instead of just responding with the cached negative response.
PRACTICE
Managing the DNS Client Cache
In this practice, you use the Ipconfig command with the /flushdns and /displaydns switches to clear and display the DNS client cache. Exercise Exploring the DNS Resolver (Client) Cache In this exercise, you observe the behavior of the DNS client cache. 1. Log on to Nwtraders from Boston as a domain administrator. 2. At a command prompt, type ipconfig /flushdns. At the command prompt, a message appears indicating that the DNS Resolver Cache has been flushed. 3. At a command prompt, type ipconfig /displaydns. The contents of the cache are displayed. Notice that it is not completely empty. The four records that appear by default include a PTR record for the IPv6 localhost address of ::1, a PTR record for the IPv4 localhost address of 127.0.0.1, an A record that maps the name localhost to the IPv4 address 127.0.0.1, and an AAAA record that maps the name localhost to the IPv6 address ::1. The addresses 127.0.0.1 and ::1 are special addresses that always point to the local computer.
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Configuring Name Resolution
4. At the command prompt, type ping dcsrv1. You receive a response from the IPv6 address of Dcrsv1. Note that the primary DNS suffix of the local computer, nwtraders.msft, has been appended to the name dcsrv1. This DNS suffix was assigned to Boston when Boston joined the Nwtraders domain. 5. At the command prompt, type ipconfig /displaydns. Beneath the same heading of dcsrv1.nwtraders.msft, two new records appear in the cache: an A record and an A A A A record. Note that the A record is associated with Dcsrv1 s IPv4 address and the AAAA record is associated with Dcrv1 s IPv6 address. 6. At the command prompt, type ipconfig /flushdns. 7. At the command prompt, type ipconfig /displaydns. The output reveals that the two new records have been flushed from the cache. 8. Close all open windows.
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