dot net qr code library B An in .NET framework

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authoritative server reported that the queried name does not exist in the DNS namespace. authoritative server reported that the queried name exists but no records of the specified type exist for that name.
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B An
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After the response is made to the query, the resolver passes the results of the query, in the form of either a positive or negative response, back to the requesting program and caches the response.
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Understanding How Caching Works
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Both the DNS Client service and the DNS Server service maintain caches. Caching pro vides a way to improve DNS performance and to substantially reduce DNS-related query traffic on the network.
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Lesson 2
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Understanding DNS in Windows Server 2003 Networks
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4-23
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DNS Client Cache
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The DNS client cache is also called the DNS resolver cache. Whenever the DNS Client ser vice starts, all host-name-to-IP-address mappings contained in a static file named Hosts are preloaded into the DNS resolver cache. The Hosts file can be found in WINDOWS \System32\Drivers\Etc.
Whenever you add an entry to the Hosts file, that entry is immediately loaded into the DNS resolver cache.
In addition to the entries in the Hosts file, the DNS resolver cache also includes entries the client has received in response to a query from DNS servers. The DNS resolver cache is emptied whenever the DNS Client service is stopped.
DNS Server Cache
As DNS servers make recursive queries on behalf of clients, they temporarily cache resource records. These cached records contain information acquired in the process of answering queries on behalf of a client. Later, when other clients place new queries that request information matching cached resource records, the DNS server can use the cached information to answer these queries. The DNS server cache is cleared whenever the DNS Server service is stopped. In addi tion, you can clear the DNS server cache manually in the DNS console the adminis trative tool used for DNS administration by right-clicking the server icon in the console tree and then clicking Clear Cache. Finally, if you have installed Windows Support Tools, you can clear the server cache at the command line by entering the com mand Dnscmd /clearcache at a command prompt. Time to Live Values A Time to Live (TTL) value applies to all cached resource records, whether in the DNS resolver cache or the DNS server cache. As long as the TTL for a cached resource record does not expire, a DNS resolver or server can con tinue to use that record to answer queries. By default, the TTL is 3600 seconds (1 hour), but this parameter can be adjusted at both the zone and record level.
Note
DNS uses multiple levels of caching to improve efficiency and performance. The downside is that, when queries are resolved by means of cached information, clients will not see the effects of a change in DNS immediately. On the public Internet, it can take as long as four hours for users to have access to the new information regardless of how the TTL is configured.
4-24
4
Configuring DNS Servers and Clients
Lesson Review
The following questions are intended to reinforce key information presented in this lesson. If you are unable to answer a question, review the lesson materials and try the question again. You can find answers to the questions in the Questions and Answers section at the end of this chapter. 1. On the network you administer, you maintain a primary DNS server authoritative for the zone lucernepublishing.com. You have also deployed two caching-only servers that forward all requests to the primary server. If most of the name queries directed toward the caching-only servers are for names within the lucernepublishing.com domain, which parameter can you modify on the primary server to decrease DNS query traffic between the caching-only servers and the primary server
2. What is the root domain of a namespace containing the FQDN first.domain1.local. a. None; the namespace has no root domain. b. domain1. c. local. d. (empty string). 3. Which step does the resolver first perform to resolve a DNS name a. It checks its local cache. b. It reads from the Hosts file. c. It broadcasts the local subnet. d. It queries the local DNS server. 4. Your network computers are turned on for the first time after a power outage. When a DNS client first submits a recursive query to a local DNS server to resolve an Internet name for which the server is not authoritative, which step takes place first a. The DNS client resolves the name from its cache. b. The DNS server resolves the name from its cache. c. The DNS server forwards the recursive query to an upstream DNS server. d. The DNS server contacts root servers configured in the Cache.dns file.
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