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MCSE Designing and Deploying a Messaging Infrastructure with Microsoft Exchange 2000 Server : 70-225 Exam
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MCSE Designing and Deploying a Messaging Infrastructure with Microsoft Exchange 2000 Server
Exam Number: 70-225 Exam
Associated Certifications: MCSE Designing and Deploying a Messaging Infrastructure with Microsoft Exchange 2000 Server
Duration: 120 Q&As

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QUESTION 254
You work as the application developer at Certkiller .com. The Certkiller .com network
consists of a single Active Directory domain named Certkiller .com. All servers on the
Certkiller .com network run Windows Server 2003 and all client computers run
Windows XP Professional. You make use of Visual Studio 2005 for creating the
applications.
You are in the process of developing a .NET Framework 2.0 graphics application
and write a Point class with two Integer fields shown below:
Class Point
Dim x, y As Integer
Public Sub New(ByVal x As Integer, ByVal y As Integer)
Me.x = x
Me.y = y
End Sub
End Class
You are required to write a method named GetPointPosition that will be used to
provide read access to the two Integer fields in the class. You must additionally
permit read access to multiple threads at the same time whilst your solution results
in fast response time and high throughput.
What should you do?
A. Private rwlock As ReaderWriterLock
Public Sub GetPointPosition(ByRef x As Integer, ByRef y As Integer)
rwlock.AcquireReaderLock(Timeout.Infinite)
Try
x = Me.x

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y = Me.y
Finally
rwlock.ReleaseReaderLock()
End Try
End Sub
B. Public Sub GetPointPosition(ByRef X As Integer, ByRef y As Integer)
SyncLock (Me)
x = Me.x
y = Me.y
End SyncLock
End Sub
C. Public Sub GetPointPosition(ByRef x As Integer, ByRef y As Integer)
Dim lockAcquired As Boolean
lockAcquired = Monitor.TryEnter(Me, 2000)
If (lockAcquired) Then
Try
x = Me.x
y = Me.y
Finally
Monitor.Exit(Me)
End Try
End If
End Sub
D. Public Sub GetPointPosition(ByRef x As Integer, ByRef y As Integer)
Monitor.Enter(Me)
Try
x = Me.x
y = Me.y
Finally
Monitor.Exit(Me)
End Try
End Sub

QUESTION 255
You work as the application developer at Certkiller .com. The Certkiller .com network
consists of a single Active Directory domain named Certkiller .com. All servers on the

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Certkiller .com network run Windows Server 2003 and all client computers run
Windows XP Professional.
You are in the process of developing a .NET Framework 2.0 application class
library. You make used of a custom class named TestResource in the application,
you create two instances of the TestResource class shown below:
Dim sr1, sr2 As TestResouce
‘Additional code goes here
You want object sr2 to be assigned to object sr1 if the values of the sr1 object is
Nothing. The code may be shared by multiple threads and you are required to write
code that is thread-safe and provides the best performance.
What should you do?
A. System.Threading.Monitor.TryEnter(Me)
If (sr1 Is Nothing) Then sr1 = sr2
System.Threading.Monitor.Exit(Me)
B. System.Threading.Interlocked.Exchange(sr1, sr2)
C. If(sr1 Is Nothing) Then
SyncLock (Me)
If sr1 Is Nothing) Then sr1 = sr2
End SyncLock
End If
D. System.Threading.Interlocked.CompareExchange(sr1, sr2, Nothing)

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