print barcode with vb.net C01620245.fm Page 37 Wednesday, June 9, 2004 5:22 PM in .NET

Print Code 128 Code Set A in .NET C01620245.fm Page 37 Wednesday, June 9, 2004 5:22 PM

Grouping together multiple comparisons is also possible with a clever use of parentheses: puts "A very young or old man" if gender == "male" && (age < 18 || age > 85) This example checks if gender is equal to "male" and if age is under 18 or over 85. If we did not use the parentheses, the line would be printed even if the gender were female and the age were over 85, because the Ruby interpreter would consider the comparisons on an individual basis, rather than making the initial && depend on satisfaction of the age < 18 || age > 85 comparison.

Server Must Supply An IP Address. Client May Request An IP Address. Server Settings Determine IP Address Assignment (the default setting). Assign A Static IP Address. The IP address assigned is typically used to accommo date vendor-specific attributes for IP addresses.

Before disabling or removing an active service, make sure you know what it is used for and what dependencies may break if it is removed. Always back up a system (or at least perform a Systemstate backup) before removing or disabling services.

Pay attention to the comments left in default files, as they are often quite informative, as in the Tip preceding code.

Summary

In PATH mode, column names and aliases serve as XPath expressions . XPath expressions define the path to the element in the XML generated . Path is expressed in a hierarchical way; levels are delimited with the slash (/) character . By default, every column becomes an

In many cases, if you apply a removable storage access policy to a computer or user and the user already has his removable device plugged in and working on his Windows Vista system, the policy will not take effect until he removes that device and reinserts it.

The library also allows you to define and implement your own interfaces. To create an interface, you define it as you would a class. However, you do not add implementation to the interface, you just include method stubs. You then call the registerInterface method of the Type class. This registers your interface for use with the library. The following code shows an example of defining and registering an interface with the library.

Troubleshooting Network Protocol Security 11-73

Building and running this application yields the following output:

When a DHCP server crashes, it can eventually take down most other services on a network. This problem occurs because in a typical network, client computers depend on DHCP servers to locate essential servers such as DNS servers and default gateways. In addition, when DHCP leases expire after a DHCP failure, computers typically lose their ability to communicate with each other. DHCP servers are thus a central point of failure, and it is essential that you be able to diagnose and repair problems that appear when DHCP service stops functioning properly. To diagnose and repair problems related to Dynamic Host Configuration Protocol (DHCP), you need to understand the nature of DHCP communication. This chapter assists in this effort by first describing the pattern of DHCP message exchanges so that they can be analyzed in a Network Monitor capture. The chapter then intro duces the format and contents of DHCP server log entries. Finally, the chapter pro vides basic troubleshooting procedures that allow you to find and repair DHCP problems on your network. Lessons in this :

Note PHP doesn t come by default with support for mhash and mcrypt, the libraries we re using in this

is preserved if the web application is restarted and also makes session state available to multiple servers in a web farm. On identical hardware, the ASP.NET State Service outperforms SQLServer. However, a SQL Server database offers more robust data integrity and reporting capabilities. In addition, many sites run their SQL Server databases on powerful hardware. You will want to performance-test for your scenario.