| Braindumps of 70-548
Designing and DevelopingWindows-Based Applications
by
Using the Microsoft .NET Framework
Exam Questions, Answers, Braindumps (70-548)
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QUESTION 1:
You work as the Enterprise application developer at
Abc .com. The Abc .com network consists of a single
Active Directory domain named Abc .com. All servers
in the domain run Windows Server 2003. The design
of applications forms part of your responsibilities
at Abc .com. Abc .com operates as a financial institution.
As such they are obligated to comply with the legislation
governing the financial institutions while protecting
the assets of their customers. One of these laws governing
financial institutions and the rights of the customers
involves the assurance that the risk of hackers tampering
with information is negated. Another of these laws
states that Abc .com must be able to submit data to
the government in case of them auditing all transactions
that involves amounts greater than $10,000. You are
currently developing an application for Abc .com.
This application will allow Abc .com to submit relevant
data to the government. This application must thus
meet the following requirements:
1. It must prevent malicious users from interpreting
the data.
2. It must prevent malicious users from tampering
with the data.
Following are the aspects included in the design of
the application:
1. Submit data to the government by accessing an Extensible
Markup Language (XML) Web service.
2. Encrypt data before transmission by using the government's
public key.
It is now up to you to make a decision as to whether
the design will meet the data integrity requirement.
What conclusion can you draw?
A. The design meets the data integrity requirement.
B. The design does not meet the data integrity requirement.
You should use the Abc .com private key to sign the
data.
C. The design does not meet the data integrity requirement.
You should use the Abc .com public key to sign the
data.
D. The design does not meet the data integrity requirement.
You should use the government's public key to sign
the data.
Answer: B
Explanation:
The design should make provision for the signing of
the data to prevent malicious tampering. When you
sign data, you in essence hash the data and encrypt
the hash with a private key that is only known to
the signer. When the government receives the data,
they will decrypt the hash by using the Abc .com public
key, rehash the data, and comparing the hash with
the decrypted hash. If the two hash values match,
then you have proof that the data was not tampered
with. Thus the data integrity requirement is not met
in this scenario and you should make use of the Abc
.com private key to sign the data.
Incorrect answers:
A: This design does not meet with the data integrity
requirements.
C: You cannot use the Abc .com public key to sign
the data. Encryption makes provision for confidentiality,
not data integrity. Furthermore if you encrypt data
using a public key, then only the corresponding private
key can be used to decrypt the data.
Because the Abc .com private key should only be available
to Abc .com, the government will not be able to decrypt
the data.
D: You cannot use the government public key to sign
the data. Public keys are publicly available and will
thus allow malicious users to tamper with the data
and then resign it as if the data is still intact
and not tampered with.
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QUESTION 2:
You work as the Enterprise application developer at
Abc .com. The Abc .com network consists of a single
Active Directory domain named Abc .com. All servers
in the domain run Windows Server 2003. The design
of applications forms part of your responsibilities
at Abc .com. Abc .com operates as a College of Education.
You are planning to develop a Microsoft Windows Forms
application for Abc .com. This application will allow
the Abc .com educational centers to manage transcripts.
The plan is to make use of Microsoft SQL Server 2005
to store the transcripts for the application. The
logical design of the application indicates a many-to-many
relationship between candidates and examinations.
The physical design suggests making use of three tables
that are named Candidate, Examination, and CandidateExamination,
respectively. These three tables are to be stored
in the same database.
Following is a list of the requirements that should
be met by the design:
1. Referential integrity between the candidates and
the examinations must be maintained by SQL Server.
2. There should be no excessive duplication of data
in existence.
You need to make a decision as to whether the design
meets these requirements. What conclusion can you
draw?
A. The design does meet the requirements.
B. The design does not meet the requirements. The
data of the three tables should be consolidated into
one table named Transcript in the same database.
C. The design does not meet the requirements. The
three tables should be placed in different databases
on the same server.
D. The design does not meet the requirements. The
data of the three tables should be consolidated into
two tables named Candidate and Examination in the
same database.
Answer: A
Explanation:
Since it is mentioned that there is a many-to-many
relationship between two entities, there is a need
for a junction table which only exists to hold data
that is unique to the relationship. Because the three
tables are located in the same database, you can allow
SQL Server to enforce referential integrity between
the tables.
Incorrect answers:
B: The three tables should not be consolidated into
a single table named Transcript in the same database.
This will not prevent the excessive duplication of
data.
C: The three tables should not be placed in different
databases on the same server. This way SQL Server
cannot enforce referential integrity between data
in different databases.
D: Though this consolidation of the three tables into
two tables named Candidate and Examination in the
same database will allow SQL Server to enforce referential
integrity, it does not prevent excessive duplication
of data because either Examination data would need
to be duplicated for each candidate who takes a particular
examination, or Candidate data would need to be duplicated
for each examination that the candidate takes.
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QUESTION 3:
You work as the Enterprise application developer at
Abc .com. The Abc .com network consists of a single
Active Directory domain named Abc .com. All servers
in the domain run Windows Server 2003. Your responsibilities
at Abc .com include the design and development of
applications. All applications should be in a Microsoft
Windows Forms environment. Abc .com offers financial
and accounting services to their customers. You are
currently developing a Microsoft Windows-based application
for Abc .com. This application will allow the CertK
ign.com employees to manage the customer accounts.
The following exhibit illustrates the event handler
which is called when a Abc .com employee attempts
to withdraw funds from an account. Exhibit:
01 Private Sub Button_Click(ByVal sender As Object,
ByVal e As EventArgs)
02 Try
03 Dim financeAccount As Account = New Account(_account
TextBox.Test)
04 financeAccount.Withdraw(Double.Parse(_amountTestBox.Text))
05 Catch ex As AccountOverdraftException
06
07 End Try
08 End Sub
You need to notify the Abc .com employee if an account
overdraft would occur. The Abc .com employee would
then inform the customer and change the amount of
the withdrawal if necessary. To this end you need
to add code at line 10 to accomplish this goal. What
should you do?
A. Use the Throw New ApplicationException("An
account overdraft would occur.", ex); code segment.
B. Use the Throw New Exception("An account overdraft
would occur."); code segment.
C. Use the MessageBox.Show("An account overdraft
would occur."); code segment.
D. Use the MessageBox.Show(ex.ToString() + "An
account overdraft would occur."); code segment.
Answer: C
Explanation:
When you call the Show method of the MessageBox class
to display a user-friendly message you will allow
the Abc .com employee to change the amount of the
withdrawal without causing the application to fail.
Incorrect answers:
A: When you throw an exception it will not allow the
Abc .com employee to change the amount of the withdrawal
and the application will fail.
B: When you throw an exception it will not allow the
Abc .com employee to change the amount of the withdrawal
and the application will fail since the exception
will be considered unhandled.
D: You should not pass the value returned from the
ToString method of the AccountOverdraftException instance
to the Show method of the MessageBox class. This would
display a lot of technical information and is in no
way user friendly for the Abc .com employee to know
that an error has occurred.
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QUESTION 4:
You work as the Enterprise application developer at
Abc .com. The Abc .com network consists of a single
Active Directory domain named Abc .com. All servers
in the domain run Windows Server 2003. Your responsibilities
at Abc .com include the design and development of
applications. Abc .com has a Microsoft Windows Forms
application that makes use of a printing component.
This component is configured to accept XmlDocument
instances that may contain graphics information. It
makes use of data in these instances and GDI+ to print
the graphics. You have been instructed to analyze
profiling results on this application and make a decision
after you have run tests on the application. To this
end you then profiled the component and obtained the
following information regarding performance after
running it on a test computer:
1. When the method is called one, 16 MB of memory
is used.
2. When the method is called twice, 32 MB of memory
is used.
3. When the method is called ten times, 160 MB of
memory is used.
You now need to make a decision as to what the next
step of action should be. What should you do?
A. Keep on profiling the component.
B. The component should be redesigned.
C. More memory should be added to the computer.
D. A larger page file should be specified on the computer.
Answer: B
Explanation:
The result clearly indicates that there is a memory
leak. It is likely that the component does not dispose
GDI+ objects that it creates which results in the
memory leaks. The solution and logical next step would
be to redesign the component.
Incorrect answers:
A: There is no need to keep on profiling the component
as it is already evident that a memory leak exists.
C: Adding more memory to the computer will only alleviate
the problem of the memory leak, but will not solve
it.
D : There is a memory leak that exists and specifying
a larger page file size will not completely solve
the problem.
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QUESTION 5:
You work as the Enterprise application developer at
Abc .com. The Abc .com network consists of a single
Active Directory domain named Abc .com. All servers
in the domain run Windows Server 2003. Your responsibilities
at Abc .com include the design and development of
Application Frameworks. You are currently developing
a Microsoft Windows Forms application. You are required
to make use of a stock control in the application.
To this end you examine a third party component that
implements stock control. This specific component
was implemented by using the Microsoft .NET Framework
1.1. You disassemble the code and discovered the following
code:
Friend MustInherit Class Stock
Inherits Control
Public Sub New()
MyBase.New
End Sub
Protected Overrides Sub OnPaint(ByVal e As PaintEventArgs)
'Paint the control
MyBase.OnPaint(e)
End Sub
End Class
You must change the way the Stock control paints itself.
Thus you need to take a decision as to whether you
can reuse the component to meet this requirement.
What conclusion can you draw?
A. The component is reusable.
B. The component is not reusable. The OnPaint method
must specify the abstract inheritance modifier.
C. The component is not reusable. The OnPaint method
must specify the virtual inheritance modifier.
D. The component is not reusable. The Stock class
must specify the public access modifier.
Answer: D
Explanation:
The component is not reusable as the Stock class is
declared with the internal access modifier; it cannot
be accessed from outside the assembly in which it
exists. It needs to specify the public access modifier.
The .NET Framework 2.0 does have the InternalsVisible
To attribute, but not the .NET Framework 1.1 version
with which this component was created.
Incorrect answers:
A: The component is not reusable since you will require
the Stock class to specify the public access modifier.
B: The abstract modifier indicates that a class member
must be implemented by a derived class. In this case
you cannot override the Stock class because it is
declared with the internal access modifier.
C: The virtual inheritance modifier allows derived
classes to override a class member, but the override
inheritance modifier also allows derived classes to
override a class member if the sealed inheritance
modifier is not applied to the member. Thus you cannot
conclude that the OnPaint method must specify the
virtual inheritance modifier.
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QUESTION 6:
You work as the Enterprise application developer at
Abc .com. The Abc .com network consists of a single
Active Directory domain named Abc .com. All servers
in the domain run Windows Server 2003. Your responsibilities
at Abc .com include the design and development of
Application Frameworks. You are developing Microsoft
Windows Forms applications. You are required to display
an opaque stock on a form in a Windows application.
To this end you examine a third-party component that
implements solid Stock control. This control has all
of the functionality that you require, except for
the fact that it does not display as an opaque stock.
The following exhibit illustrates the class definition:
Exhibit:
Public Class Stock
Inherits Control
Protected Overrides Sub OnPaint(ByVal e As PaintEventArgs)
'Paint a solid stock
'Do not call the base OnPaint method
End Sub
End Class
You need to reuse the Stock control. You must ensure
that your solution allows for changes made to the
Stock control to be reflected automatically in the
application. What should you do? (Choose the appropriate
code segment.)
A. Public Class SolidStock
Inherits Stock
Private _stock As Stock = New Stock()
Protected Overrides Sub OnPaint(ByVal e As PaintEventArgs)
'Paint a solid stock
AddHandler _stock.Paint,AddressOf StockPaint
End Sub
Private Sub StockPaint(ByVal sender As Object, ByVal
e As PaintEventArgs)
OnPaint(e)
End Sub
End Class
B. Public Class SolidStock
Private _stock As Stock = New Stock()
Protected Sub OnPaint(ByVal e As PaintEventArgs)
'Paint a solid stock
AddHandler _stock.Paint,AddressOf StockPaint
End Sub
Private Sub StockPaint(ByVal sender As Object, ByVal
e As PaintEventArgs)
OnPaint(e)
End Sub
End Class
C. Public class SolidStock
Inherits Control
Protected Overrides Sub OnPaint(ByVal e As PaintEventArgs)
'Paint a solid stock
End Sub
End Class
D. Public Class SolidStock
Inherits Stock
Protected Overrides (Sub OnPaint(ByVal e As PaintEventArgs)
'Paint a solid stock
End Sub
End Class
Answer: D
Explanation:
The SolidStock class must be derived from the Stock
class and override the OnPaint method. This will allow
you to inherit all the functionality of the Stock
control except for painting functionality. In the
overridden OnPaint method, you should implement the
painting logic for displaying a solid stock.
Incorrect answers:
A: You should not declare the SolidStock class without
specifying a Control-derived base class. Only classes
that derive directly or indirectly from Control can
be visually displayed on forms.
B: There is no need to attach an event handler to
the Paint event of the Stock class. The OnPaint method
of the Stock class does not call the OnPaint method
of the Control class; however, the OnPaint method
of the control class is responsible for raising the
Paint event. And in this scenario the Paint event
never gets raised.
C: You should not derive the SolidStock class from
control as it will not allow you to reuse the functionality
that is exposed by the Stock control.
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QUESTION 7:
You work as the Enterprise application developer at
Abc .com. The Abc .com network consists of a single
Active Directory domain named Abc .com. All servers
in the domain run Windows Server 2003 and all client
computers run Microsoft Windows XP Professional. Your
responsibilities at Abc .com include the testing and
stabilization of Applications. One of the Abc .com
Windows Forms applications contains the following
production environment specifications:
1. The application is deployed to production desktop
computers.
2. A Web service that is used by the application is
deployed to a production Web server.
3. The production desktop computers run Microsoft
Windows XP Professional.
Following is the test environment specification for
performance testing that the development team created:
1. The application is deployed to production desktop
computers.
2. The Web service is deployed to a staging Web server.
3. The staging Web server's hardware configuration
is identical to the production Web server.
4. The Web servers have 1 gigabyte (GB) of memory.
You need to make a decision as to whether the test
environment specification is appropriate.
What conclusion can you draw?
A. The test environment is appropriate.
B. The test environment is inappropriate. The Web
service should be deployed to the production Web server.
C. The test environment is inappropriate. The staging
Web server's hardware configuration should be changed.
D. The test environment is inappropriate. The application
should be deployed to test desktop computers.
Answer: D
Explanation:
When testing an application for performance, one should
perform testing in an isolated environment that is
similar to the production environment and not to the
production desktop computers as suggested in the question.
The test environment is thus inappropriate. You should
also be making use of test desktop computers.
Incorrect answers:
A: This is incorrect since you should not make use
of production desktop computers when doing performance
testing.
B: You should not be deploying the Web service to
the production server; it should be deployed to a
staging server so as to facilitate the isolation aspect
of performance testing.
C: There is no need to change the hardware configuration
of the staging server because the test environment
should mimic the production environment which also
includes hardware configuration.
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QUESTION 8:
You work as the Enterprise application developer at
Abc .com. The Abc .com network consists of a single
Active Directory domain named Abc .com. All servers
in the domain run Windows Server 2003 and all client
computers run Microsoft Windows XP Professional. Your
responsibilities at Abc .com include the testing and
stabilization of Applications. You are currently evaluating
an existing performance testing strategy for one of
the Microsoft Windows Forms applications for Abc .com.
This application was developed to allow the Abc .com
customers to scan checks and submit the images to
financial institutions electronically. The performance
testing strategy that is under scrutiny now specifies
that the actual rate at which checks are imaged and
stored into a database will be compared against a
preferred rate. You need to make a decision as to
whether the performance strategy is appropriate. What
conclusion can you draw?
A. The performance testing strategy is appropriate.
B. The performance testing strategy is inappropriate.
The number of checks that are imaged correctly should
be identified.
C. The performance testing strategy is inappropriate.
The number of checks that are imaged incorrectly should
be identified.
D. The performance testing strategy is inappropriate.
The number of checks that cannot be imaged due to
physical defects should be identified.
Answer: A
Explanation:
The test identifies the rate at which the checks are
imaged and stored in a database. This will allow you
to determine whether the check imaging process is
performing as expected. Thus this strategy is an appropriate
one.
Incorrect answers:
B: When one test application performance one does
not identify the number of checks that are imaged
correctly; one test the application according to predefined
thresholds.
C: When one test application performance one does
not identify the number of checks that are imaged
incorrectly; one test the application according to
predefined thresholds.
D: You should not be identifying the number of checks
that cannot be imaged due to physical defects when
testing application performance. This will not allow
you to control the validity of the checks with the
application.
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70-548
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