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Describe the design approach to the class Overview comments that provide information that can t readily be reverse engineered from coding details are especially useful. Describe the class s design philosophy, overall design approach, design alternatives that were considered and discarded, and so on. Describe limitations, usage assumptions, and so on Similar to routines, be sure to describe any limitations imposed by the class s design. Also describe assumptions about input and output data, error-handling responsibilities, global effects, sources of algorithms, and so on. Comment the class interface Can another programmer understand how to use a class without looking at the class s implementation If not, then class encapsulation is seriously at risk. The class s interface should contain all the information anyone needs to use the class. The JavaDoc convention is to require, at a minimum, documentation for each parameter and each return value (Sun Microsystems 2000). This should be done for all exposed routines of each class (Bloch 2001). Don t document implementation details in the class interface A cardinal rule of encapsulation is that you expose information only on a needto-know basis: if there is any question about whether information needs to be exposed, the default is to keep it hidden. Consequently, class interface files should contain information needed to use the class, but not information needed to implement or maintain the inner workings of the class.

and grant VPN access to authorized users only. It must also provide audit and accounting records to show who connected and for how long.

12

1. On Computer2, create a directory called C:\Temp and share it as Temp with Administrators: Full Control permissions. 2. Switch to Computer1 and while you are logged on as Administrator, press Ctl+Alt+Del and select Task Manager. Task Manager launches. 3. Select the Networking tab. 4. From the View menu, click Select Columns. 5. Choose to view the following counters:

At the top of a file, use a block comment to describe the contents of the file. Here are some guidelines for the block comment:

6. Click OK. 7. From the Start menu, select Run, and type cmd to open a command prompt. 8. At the command prompt, type net use T: \\computer2\temp. 9. At the command prompt, type copy c:\windows\driver cache\i386\ driver.cab T: /y. 10. At the command prompt, type net use T: /delete. You will see the network utilization spike on the graph. Also note that the Uni casts/Interval will rise, but the Nonunicasts/Interval should stay flat. These counter values indicate that valid data is being transferred.

Describe the purpose and contents of each file The file header comment should describe the classes or routines contained in a file. If all the routines for a program are in one file, the purpose of the file is pretty obvious it s the file that contains the whole program. If the purpose of the file is to contain one specific class, the purpose is also pretty obvious it s the file that contains the class with a similar name.

on the intranet and ensure that addresses used on the intranet are kept pri vate. Also, certain information to allow the client to access resources on the protected network needs to be provided. For example, routing information, resource name resolution, and quarantine security can be provided as well as security filters to ensure the protection of internal data from unauthorized use.

In this exercise, you create a network alert in the event log of Computer1 using the Per formance console when the Packets Sent/Sec counter is more than 5. 1. From the Start menu, select Run, and type perfmon.exe. 2. Expand the Performance Logs And Alerts node, and then right-click Alerts and select New Alert Settings. 3. In the Name field, type packets sent alert and click OK. 4. On the General tab of the Packets Sent Alert window, click Add. 5. From the Performance Object list, select the Network Interface object, and choose Packets Sent/Sec from the counters in the list.

Monitoring Network Performance 12-19

If the file contains more than one class, explain why the classes need to be combined into a single file.