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Figure 32.10 Hierarchical network management typically consists of two or more distinct manage-

Signal splitters and combiners are, essentially, the same product (like the one shown in Figure 13-7). In fact, if you buy one, all you have to do to convert it from a splitter to a combiner is to flip it over and change the inputs and the outputs.

Data Source: Summary Database Table: SDB_SESSION Purpose: Viewing the usage of applications across selected servers over a period of time. Details: The Application Usage report displays the total number of sessions and the maximum concurrent number of sessions for each application selected. This report displays a table of the most heavily used applications out of the list of selected applications. Heavily used is defined by the highest values for maximum concurrent users. The total number of applications to display is configurable. Optionally, the Application Usage report displays a table of unused applications. These are applications that have no sessions during the reporting period. In addition, the Application Usage report optionally displays a graph of time vs. concurrent sessions for each application selected.

C++ allows the initialization of arrays. The general form of array initialization is similar to that of other variables, as shown here: type-specifier array_name[size] = {value-list}; The value-list is a comma-separated list of values that are type-compatible with the base type of the array. The first value will be placed in the first position of the array, the second value in the second position, and so on. Notice that a semicolon follows the }. In the following example, a 10-element integer array is initialized with the numbers 1 through 10:

However, in C this prototype means something different. For historical reasons, an empty parameter list simply says that no parameter information is given. As far as the compiler is concerned, the function could have several parameters or no parameters. In C, when a function has no parameters, its prototype uses void inside the parameter list. For example, here is f( ) s prototype as it would appear in a C program:

void geninterrupt(int intr)

Throwing in the usual constant of integration, we obtain 1 2 sin x + C. 2 Now we complete our work by evaluating the de nite integral: sin x cos x dx =

The operation of the nonrecursive method FactI( ) should be clear. It uses a loop starting at 1 and progressively multiplies each number by the moving product. The operation of the recursive FactR( ) is a bit more complex. When FactR( ) is called with an argument of 1, the method returns 1; otherwise, it returns the product of FactR(n 1)*n. To evaluate this expression, FactR( ) is called with n 1. This process repeats until n equals 1 and the calls to the method begin returning. For example, when the factorial of 2 is calculated, the first call to FactR( ) will cause a second call to be made with an argument of 1. This call will return 1, which is then multiplied by 2 (the original value of n). The answer is then 2. You might find it interesting to insert WriteLine( ) statements into FactR( ) that show at what level each call is and what the intermediate results are. When a method calls itself, new local variables and parameters are allocated storage on the system stack, and the method code is executed with these new variables from the start. (A recursive call does not make a new copy of the method.) As each recursive call returns, the old local variables and parameters are removed from the stack, and execution resumes at the point of the call inside the method. Recursive methods could be said to telescope out and back. Recursive versions of many routines may execute a bit more slowly than the iterative equivalent because of the added overhead of the additional method calls. Too many recursive calls to a method could cause a stack overrun. Because storage for parameters and local variables is on the stack and each new call creates a new copy of these variables, it is possible that the stack could be exhausted. If this occurs, the CLR will throw an exception. However, you probably will not have to worry about this unless a recursive routine runs wild. The main advantage to recursion is that some types of algorithms can be implemented more clearly and simply recursively than they can be iteratively. For example, the quicksort sorting algorithm is quite difficult to implement in an iterative way. Also, some problems, especially AI-related ones, seem to lend themselves to recursive solutions. When writing recursive methods, you must have a conditional statement somewhere, such as an if, to force the method to return without the recursive call being executed. If you don t do this, once you call the method, it will never return. This type of error is very common when working with recursion. Use WriteLine( ) statements liberally so that you can watch what is going on and abort execution if you see that you have made a mistake.

Router(config-if)# exit Router(config)# interface fastethernet0/0.1 Router(config-subif)# encapsulation dot1q 10 Router(config-subif)# ip address 172.16.1.1 255.255.255.0 Router(config-subif)# exit Router(config)# interface fastethernet0/0.2 Router(config-subif)# encapsulation dot1q 20 Router(config-subif)# ip address 172.16.2.1 255.255.255.0 Router(config-subif)# exit