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The DNS database is indexed by name, so each domain (node) must have a name The hierarchical structure of the domain namespace consists of a root domain, top-level domains, second-level domains, and host names DNS name servers resolve forward and reverse lookup queries A forward lookup query resolves a name to an IP address, and a reverse lookup query resolves an IP address to a name A name server can resolve a query only for a zone for which it has authority If a name server cannot resolve the query, it passes the query to other name servers that can resolve it The name server caches the query results to reduce the DNS traffic on the network.

When configuring a DNS client in an environment in which there are DNS name servers, you can configure the client to obtain the address of the DNS server automatically from a DHCP server or you can manually enter multiple addresses for DNS servers..

By modifying the settings on the Security tab of the Internet Options dialog box, as shown in Figure 11-12, administrators can specify what level of access the sites in each zone should have. Of course, as with nearly every setting in Windows 7, an enterprise environment complicates the configuration process.

As you can see, using aliases in HQL and JPA QL is the same for both direct classes and joined associations. You used a collection in the previous examples, but the syntax and semantics are the same for single-valued associations, such as many-toone and one-to-one. You assign aliases in the FROM clause by naming the association and then use the aliases in the WHERE and possibly SELECT clause. HQL and JPA QL offer an alternative syntax for joining a collection in the FROM clause and to assign it an alias. This IN() operator has its history in an older version of EJB QL. It s semantics are the same as those of a regular collection join. You can rewrite the last query as follows:

Exam Highlights 13-47

Before taking the exam, review the key points and terms that are presented in this chapter. You need to know this information.

The from Item i in(i.bids) b results in the same inner join as the earlier example with from Item i join i.bids b.

Learn the IP address ranges that fall into each of the major classes (A, B, and C) and the default subnet mask for each class. This information will not only help determine how a classful IP addressing scheme will apply to a situation, but also how to customize a scheme using the classless method. If you are troubleshooting a network problem and discover that a client computer has an IP address on the 169.254.0.0 network, the computer has assigned itself that address using APIPA because the computer could not locate a DHCP server. Understand the various options available with the Ipconfig command. In particular, you should remember the following: /renew causes the computer to release and then attempt to renew an IP address lease from a DHCP server; /release causes the computer to release its IP address lease and not attempt to renew that lease; and /flushdns purges the local DNS cache.

Automatic Private IP Addressing (APIPA) A feature that allows Windows XP Professional to assign itself an IP address should the computer not be able to locate a DHCP server. Addresses in the range 169.254.0.0 through 169.254.255.255 are reserved for APIPA. Domain Name System (DNS) A service that resolves domain names to IP addresses.

So far, you ve only written inner joins. Outer joins are mostly used for dynamic fetching, which we ll discuss soon. Sometimes you want to write a simple query with an outer join without applying a dynamic fetching strategy. For example, the following query is a variation of the first query and retrieves items and bids with a minimum amount: