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Converting this to decimal, you dis cover that the value is equal to 255 You should avoid issuing this number to a host This is discussed in more detail in the subnetting section later in this chapter For now, understand that all zeros and all ones are not allowed So, 8 bits gives us 28 2 (256 2), or 254 possible addresses you can issue to your workstations, servers, and so on, if you purchased a Class C address There are also Class A, B, and C addresses that can be used by your company as inter nal IP addresses That is, routers across the Internet will not route the packets that use these private addresses, but your company can use the addresses to connect its infra structure.

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.

By using a private address strategy, you can save your company money while having an unlimited number of IP addresses available to assign to your network resources These private IP addresses can also access the Internet when using a network address translator (NAT), which is covered in 9, Designing Internet Connectiv ity Table 8-2 illustrates the addresses that do not need to be registered with the.

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After the interface appears, you can click Run The Deployment Wizard To Install A New Operating System. The User Credentials window appears, in which you must type domain or local credentials in the User Name, Password, and Domain text boxes that provide access to the deployment share.

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.

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.

Table 8-2

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.

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