Briefly describe a packet sniffer.

What will be an ideal response?

One means of monitoring the network is to use a packet sniffer, which captures TCP/IP packets as they are being transmitted.Wired packet sniffers can be either separate devices or software that is installed on a computer and operates in promiscuous mode. There are three categories of packet sniffers based on their functions:
* Counts the number of packets that are being transmitted
* Shows general characteristics of traffic
* Provides a detailed analysis of all protocols

Computer Science & Information Technology

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Here is a small program. Which of the statements about this code is correct?

``` #include const double NUM = 2.9345358; double num = 3; double numTimes(int x); int main( ) { using namespace std; int value; cout << “Enter a value, I’ll multiply it by “ << NUM << endl; cin >> value; cout << “You entered “ << value << “ NUM times this is “ << numTimes(value) << endl; return 0; } double numTimes(int x) { double d; d = NUM * x; return d; ``` a) The variable x is a parameter in function numTimes b) The variable value is an argument in a call to numTimes. c) The line double numTimes(int x); is a function definition. d) The line return d; in the function numTimes is necessary. e) The lines of code are a function declaration:

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Computer Science & Information Technology

Which of the following statements is false?

a. When the user interacts with a GUI component, the interaction—known as an event—drives the program to perform a task. b. For events that occur when the value of a control’s property changes, you must create the event handler entirely using only drag and drop in Scene Builder. c. The code that performs a task in response to an event is called an event handler. d. For certain events you can link a control to its event-handling method by using the Code section of Scene Builder’s Inspector window. In this case, the event-listener interface is implemented for you to call the method that you specify.

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Computer Science & Information Technology

Why do moviemakers use a green or blue screen for special effects instead of a red screen?

What will be an ideal response?

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Computer Science & Information Technology

Match the following terms to their meanings:

I. HTML II. Webpage III. Tag IV. XML V. XML schema A. Text files that contain text and codes that a web browser interprets as the page is loaded B. If you need to display an Access object on a webpage, export the object to this format C. Language recognized by many programs that allows you to create your own set of tags D. Begins with the character < and ends with the character > E. It defines the tag names, order, relationships, and data type and is essential to ensure that all of the table relationships and data types are preserved when the data is imported into another database

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Computer Science & Information Technology