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Correct Answers: C A. Incorrect: In this scenario, the computer and both of the router s network interfaces have been configured with class A addresses. However, class A addresses can have a subnet mask of 255.255.255.0. In fact, a subnet mask of 255.0.0.0 would be extremely unusual. B. Incorrect: The computer s default gateway should be set to the IP address of the router s local network adapter. In other words, the default gateway must be set to the IP address that the router has been assigned on the local network. In this case, the default gateway is correct. C. Correct: The problem is that the computer s IP address and the router s local IP address are on different logical subnets. The computer has been configured with an IP address of 10.1.2.2, but the default gateway is 10.1.3.1. Because the default gateway is on a different logical subnet, the computer cannot send packets to it even though it is on the same physical network segment. Assigning the computer an IP address of 10.1.3.2 places it on the same logical subnet as the router s 10.1.3.1 address, allowing it to send packets to the router. D. Incorrect: Each network interface must have a unique IP address. Therefore, you cannot configure two network adapters to have the same IP address.

Connect to Computers by Using Dial-Up Networking 26-13

The <join> element groups some properties and tells Hibernate to get them from a secondary table. This mapping element has many uses, and you ll see it again later in the book. In this example, it separates the CreditCard properties from the table per hierarchy into the CREDIT_CARD table. The CREDIT_CARD_ID column of this table is at the same time the primary key, and it has a foreign key constraint referencing the BILLING_DETAILS_ID of the hierarchy table. The BankAccount subclass is mapped to the hierarchy table. Look at the schema in figure 5.4. At runtime, Hibernate executes an outer join to fetch BillingDetails and all subclass instances polymorphically:

There are two primary ways to gain remote access to your internal network: dial-up networking and a VPN. With dial-up networking, you connect your Windows XP computer to a telephone line and use the telephone line to connect to a remote access server at your office. With a VPN, you connect your Windows XP computer to the Internet and use the Internet to connect to a VPN server at your office. ICS provides a convenient way for small business and home users to connect multiple systems to the Internet using a single connection. ICS combines three software services: DHCP, Network Address Translation (NAT), and DNS proxy. DHCP is used to assign private IP addresses to other computers on the local area network (LAN). NAT translates the private IP addresses used by the internal computers into the public IP address assigned by the ISP. DNS proxy enables systems residing on the LAN to resolve domain names to public IP addresses. To successfully answer questions in this objective, you must know how to create dialup and VPN connections. Additionally, you should understand how to configure and use ICS.

26-14

select BILLING_DETAILS_ID, BILLING_DETAILS_TYPE, OWNER, CC.CC_NUMBER, CC.CC_EXP_MONTH, CC.CC_EXP_YEAR, BA_ACCOUNT, BA_BANKNAME, BA_SWIFT from BILLING_DETAILS left outer join CREDIT_CARD CC on BILLING_DETAILS_ID = CC.CREDIT_CARD_ID

26

Which of the following accurately describes Layer Two Tunneling Protocol (L2TP) tunneling Choose three correct answers. A. Supports Internet Protocol security (IPSec) authentication B. Supports header compression C. Automatically provides privacy using Point-to-Point Protocol (PPP) encryption D. Supported by Microsoft Windows NT 4.0 E. Requires authentication of both the computer and the user

You can also use the <join> trick for other subclasses in your class hierarchy. However, if you have an exceptionally wide class hierarchy, the outer join can become a problem. Some database systems (Oracle, for example) limit the number of tables in an outer join operation. For a wide hierarchy, you may want to switch to a different fetching strategy that executes an immediate second select instead of an outer join: