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When the security algorithm is configured for CTP, it first authenticates connections before permitting them through the firewall. Figure 1-4 illustrates the steps that occur for CTP: 1. User Pong initiates an FTP to 200.200.200.2. 2. The appliance intercepts the connection and checks for an entry in its conn table if the entry exists, the appliance permits the connection (step 4A). In this case, the user has previously been authenticated. 3. If the appliance does not find an entry in the conn table, it will prompt the user Pong for a username and a password, and forward this information to the security server for authentication.

Linked universes allow a designer to build one master universe called the kernel that then is used to build a subsequent universe called a derived universe. Companies generally use linked universes in one of several ways: A central universe designer builds a reference universe that contains common dimension classes that then get linked to other universes. In the derived universes, a second designer can add universe-specific tables. For example, in Figure 15-1, the tables and corresponding classes and objects for Time, Products, and Customers exist in the kernel universe. The designer for the Sales universe links to the kernel to use these common classes and objects. The Sales designer hides classes that sales users do not need (Accounts, Employees) and adds new tables to the derived universe (SALES_FACT). This approach can drastically reduce implementation and maintenance efforts, while ensuring a consistent universe interface across multiple universes. A central universe designer maintains one kernel universe that contains all the star schemas in the data warehouse; business unit designers then create smaller derived universes that are focused on their individual user group (Figure 15-2). The business unit designer may hide many classes.

their view of reality. Should this occur, the developer can say, What if your assumption isn t the only way to perceive the situation

Each network architecture has its own protocol stack, made up of different protocols that in many cases are performing equivalent functions to those in the OSI model. The functionality of most stacks is represented in the OSI Reference Model. Despite the wide variety of protocols, however, some basic functions performed by protocols are common to all. These perform the real work in a network architecture and often are the points where failure occurs. Thus, they are the points of interest for performance monitoring. Protocol analysis is used to examine the protocol information that performs these functions. Functions that are of particular interest in performing protocol analysis include:

will cause p1 to have the value 1,996, assuming that it previously was 2,000. Here is why: Each time that a pointer is incremented, it will point to the memory location of the next element of its base type. Each time it is decremented, it will point to the location of the previous element of its base type. In the case of character pointers, an increment or decrement will appear as "normal" arithmetic because characters are one byte long. However, every other type of pointer will increase or decrease by the length of its base type. You are not limited to only increment and decrement operations. You can also add or subtract integers to or from pointers. The expression

9,999; <Null>; 1 9,999.00; 0.00; 1.00 +9999; <Null>; +1 9999; <Null>; 1 9999.0%; .0%; 1.0% 9999.0 %; 0.0 %; 1.0 %

Here is a: 1, 2, 3 Here is b: 10, 10, 10 Result of a + b: 11, 12, 13 Result of b + 10: 20, 20, 20

Exception de nes the following four constructors: public Exception( ) public Exception(string str) public Exception(string str, Exception inner) protected Exception(System.Runtime.Serialization.SerializationInfo si, System.Runtime.Serialization.StreamingContext sc) The first is the default constructor. The second specifies the string associated with the Message property associated with the exception. The third specifies what is called an inner exception. It is used when one exception gives rise to another. In this case, inner specifies the first exception, which will be null if no inner exception exists. (The inner exception, if it exists, can be obtained from the InnerException property defined by Exception.) The last constructor handles exceptions that occur remotely and require deserialization. One other point: In the fourth Exception constructor shown above, notice that the types SerializationInfo and StreamingContext are contained in the System.Runtime.Serialization namespace.