70-649 Practice Upgrading MCSE on Windows Server 2003 to Windows Server 2008, Technology Specialist
Q&A 233 Questions. Last Updated 6/20/2008

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QUESTION 139:
You develop a Windows-based application by using Visual Studio .NET. The
application includes numerous method calls at startup. After optimizing your
application code, you test the application on a variety of client computers. However,
the startup time is too slow.
You must ensure that your application starts as quickly as possible the first time it
runs. What should you do?
A. Precompile your application by using the Native Image Generator (Ngen.exe):
Install the precompiled application on the client computers.
B. Install your application on the client computers.
Precompile your application by using the Native Image Generator (Ngen.exe).
C. Precompile your application by using the JIT compiler.
Install the precompiled application on the client computers.
D. Install your application on the client computers.
Precompile your application by using the JIT compiler.
Answer: B
Explanation: The Native Image Generator creates a native image from a managed
assembly and installs it into the native image cache on the local computer. Running
Ngen.exe on an assembly allows the assembly to load and execute faster, because it
restores code and data structures from the native image cache rather than
generating them dynamically.
The native image contains processor-specific machine code and in this scenario a variety
of client computers are used. We must therefore use the Ngen.exe utility at the client
computers after the installation, not at the Development computer..
Reference:
.NET Framework Tools, Native Image Generator (Ngen.exe)
70-306/70-316 Training kit, Installing a Native Assembly Image, Page 495
.NET Framework Developer’s Guide, Compiling MSIL to Native Code
Incorrect Answers
A: The Native Image produced by Ngen.exe is machine-specific and in this scenario a
variety of client computers are used. We cannot use the a single Native Image from once
computer on all the other computers..
C, D: JIT (just-in-time) compilation occurs at run-time, and cannot be precompiled.
Note: When you compile a .NET application, it is not compiled to binary machine code;
rather, it is converted to IL, which is a low-level set of instructions understood by the
common language run time. When execution starts, the first bit of code that needs to be

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executed is loaded into memory and compiled into native binary code from IL by the
common language run time’s Just-In-Time (JIT) compiler.
QUESTION 140:
You develop a Windows-based application by using Visual Studio .NET. The
application includes a form named Certkiller Form and a class named Contact.
Certkiller Form includes a button named cmdCreateContact. You must ensure that
your application creates an instance of Contact when a user clicks this button. You
want to write the most efficient code possible.
Which code segment should you use?
A. Contact contact = new Object();
B. Contact contact = new Contact();
C. Object contact = new Contact();
D. Contact contact = new Object();
Answer: B
Explanation: We declare that contact should be of type Contact and we use the
Contact constructor.
Reference:
Incorrect Answers
A, D: The constructor of the class has the same name as the class, namely Contact.
C: We must specify that the object should be an instance of the Class object, not any
object.
Object contact = new Contact();
QUESTION 141:
Another developer in your company uses Visual Studio .NET to create a component
named CertK iComponent. You deploy CertK iComponent to a server. When you
execute CertK iComponent, you receive the following error message:
“System.Security.Policy.PolicyException: Failed to acquire required permissions.”
As quickly as possible, you need to discover which permissions are required by
CertK iComponent.
What should you do?
A. Request the source code from the developer who created My Component.
Examine the source code to find the required permissions.
B. Run the Microsoft CLR Debugger (DbgCLR.exe) on the server to view the
permissions requested by the application at run time.
C. Run the Runtime Debugger (Cordbg.exe) on the server to view the permissions
requested by the application at run time.
D. Run the Permissions View tool (Permview.exe) on the server to view the permissions
required by CertK iComponent.

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E. Run the MSIL Disassembler (IIdasm.exe) on the server to view permissions requested
by CertK iComponent that were denied.
Answer: D
Explanation: Developers can use Permview.exe to verify that they have applied
permission requests correctly to their code. Additionally, users can run
Permview.exe to determine the permissions an assembly requires to execute.
Reference: .NET Framework Tools, Permissions View Tool (Permview.exe)

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