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Name resolution is the process of resolving names to IP addresses. It is similar to looking up a name in a telephone book, in which the name is associated with a telephone number. For example, when you connect to the Microsoft Web site, you use the name www.microsoft.com. DNS resolves www.microsoft.com to its associated IP address. The mapping of names to IP addresses is stored in the DNS distributed database. 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.

The first thing to do, obviously, is to try accessing the same Web site yourself. If you can access the site, and other users still cannot, that tells you there is an issue on those other users computers or on the network that is preventing them from connecting to the site. For whatever reason that issue is not affecting you means you have to begin looking for network issues that can affect multiple users.

This is a valid HQL query, but it s invalid in JPA QL the standard requires that you use a SELECT clause. Still, the same result that is implicit from this product of Item and Bid can also be produced with an explicit SELECT clause. This query returns ordered pairs of Item and Bid instances:

Explain how a forward lookup query works. Explain the purpose of name server caching. Explain how a reverse lookup query works.

The DNS Service uses a client/server model for name resolution. To resolve a forward lookup query, which resolves a name to an IP address, a client passes a query to a local name server. The local name server either resolves the query and provides an IP address or queries another name server for resolution. Figure 13-10 represents a client querying the name server for an IP address of www.microsoft.com.

Query q = session.createQuery("from Item i, Bid b"); // Query q = em.createQuery("select i, b from Item i, Bid b"); Iterator pairs = q.list().iterator(); // Iterator pairs = q.getResultList().iterator(); while ( pairs.hasNext() ) { Object[] pair = (Object[]) pairs.next(); Item item = (Item) pair[0]; Bid bid = (Bid) pair[1]; }

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This query returns a List of Object[]. At index 0 is the Item, and at index 1 is the Bid. Because this is a product, the result contains every possible combination of Item and Bid rows found in the two underlying tables. Obviously, this query isn t useful, but you shouldn t be surprised to receive a collection of Object[] as a query result. The following explicit SELECT clause also returns a collection of Object[]s:

Figure 13-10

The numbers in Figure 13-10 depict the following activities: 1. The client passes a forward lookup query for www.microsoft.com to its local name server. 2. The local name server checks its zone database file to determine whether it contains the name-to-IP address mapping for the client query. The local name server does not have authority for the microsoft.com domain, so it passes the query to one of the DNS root servers, requesting resolution of the host name. The root name server sends back a referral to the com name server. 3. The local name server sends a request to a com name server, which responds with a referral to the Microsoft name server. 4. The local name server sends a request to the Microsoft name server. Because the Microsoft name server has authority for that portion of the domain namespace, when it receives the request, it returns the IP address for www.microsoft.com to the local name server. 5. The local name server sends the IP address for www.microsoft.com to the client. 6. The name resolution is complete, and the client can access www.microsoft.com.

select i.id, i.description, i.initialPrice from Item i where i.endDate > current_date()