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This is the complete mapping for a many-to-many association with extra columns on the join table. The <many-to-one> element represents the association to Item; the <property> mappings cover the extra columns on the join table. There is only one change to the database tables: The CATEGORY_ITEM table now has a primary key that is a composite of all columns, not only CATEGORY_ID and ITEM_ID, as in the previous section. Hence, all properties should never be nullable otherwise you can t identify a row in the join table. Except for this change, the tables still look as shown in figure 7.11. You can enhance this mapping with a reference to the User instead of just the user s name. This requires an additional USER_ID column on the join table, with a foreign key to USERS. This is a ternary association mapping:

Page 15-40

1. Which two modes of networking are available for connecting to a wireless network in Windows XP Professional

<set name="categorizedItems" table="CATEGORY_ITEM"> <key column="CATEGORY_ID"/> <composite-element class="CategorizedItem"> <parent name="category"/> <many-to-one name="item" column="ITEM_ID" not-null="true" class="Item"/> <many-to-one name="user" column="USER_ID" not-null="true" class="User"/> <property name="dateAdded" column="ADDED_ON"/> </composite-element> </set>

Ad-hoc wireless networking, in which there are multiple stations but no AP and infrastructure , wireless networking, in which stations connect to an AP .

MAC address filtering, disabling SSID broadcasting, using WEP encryption, and using WPA encryption.

This is a fairly exotic beast! The advantage of a collection of components is clearly the implicit lifecycle of the link objects. To create an association between a Category and an Item, add a new CategorizedItem instance to the collection. To break the link, remove the element from the collection. No extra cascading settings are required, and the Java code is simplified:

3. When you configure 802.1x authentication for wireless networking in Windows XP Professional, all wireless connections use the same authentication settings. (True/False)

False. Windows XP Professional allows you to configure 802.1x authentication on a per-connection basis.

CategorizedItem aLink = new CategorizedItem(aUser.getUserName(), aCategory, anItem); aCategory.getCategorizedItems().add( aLink ); aCategory.getCategorizedItems().remove( aLink );

For details about all the practice test options available, see the How to Use the Practice Tests section in this book s Introduction.

Page 15-44

1. A user has set up ICS on a host computer that runs Windows XP Professional, but is experiencing problems with clients being able to connect to both the Internet and other computers on the network. Which of the following items could be the cause of the problems Choose all that apply. a. There is a DHCP server on the network. b. There is a DNS server on the network. c. There are computers on the network with static IP addresses. d. There is a Windows 2000 server on the network.

The downside of this approach is that there is no way to enable bidirectional navigation: A component (such as CategorizedItem) can t, by definition, have shared references. You can t navigate from Item to CategorizedItem. However, you can write a query to retrieve the objects you need. Let s do the same mapping with annotations. First, make the component class @Embeddable, and add the component column and association mappings:

A, B, and C are correct. DHCP and DNS servers as well as computers with static IP addresses all cause problems for ICS. D is not correct because Windows 2000 servers can be members of workgroups and work with ICS as long as they are not also domain controllers that provide DHCP or DNS services.

3. After enabling ICS on the host computer, how should you configure other computers in the workgroup to connect to the Internet through the ICS computer

@Embeddable public class CategorizedItem { @org.hibernate.annotations.Parent // Optional back-pointer private Category category; @ManyToOne @JoinColumn(name = "ITEM_ID", nullable = false, updatable = false) private Item item; @ManyToOne @JoinColumn(name = "USER_ID", nullable = false, updatable = false) private User user; @Temporal(TemporalType.TIMESTAMP) @Column(name = "ADDED_ON", nullable = false, updatable = false) private Date dateAdded; ... // Constructor // Getter and setter methods // Don't forget the equals/hashCode methods }

You should configure other computers to obtain an IP address automatically. The ICS host acts as DHCP server, assigning IP addresses in the range 192.168.0.2 through 192.168.0.254 to other computers on the network.

Questions and Answers 15-67

Now map this as a collection of components in the Category class:

Page 15-58

1. You are troubleshooting a network connection and need to use the Ping command to see if a computer is reachable. Which ICMP exception must you enable on that computer Choose the correct answer. a. Allow Incoming Router Request b. Allow Incoming Echo Request c. Allow Outgoing Source Quench d. Allow Redirect