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Q91. - (Topic 2) 

You need to create a method that can be called by using a varying number of parameters. 

What should you use? 

A. derived classes 

B. interface 

C. enumeration 

D. method overloading 

Answer: D 

Explanation: Member overloading means creating two or more members on the same type that differ only in the number or type of parameters but have the same name. Overloading is one of the most important techniques for improving usability, productivity, and readability of reusable libraries. Overloading on the number of parameters makes it possible to provide simpler versions of constructors and methods. Overloading on the parameter type makes it possible to use the same member name for members performing identical operations on a selected set of different types. 

Q92. - (Topic 1) 

You are developing a method named CreateCounters that will create performance counters for an application. 

The method includes the following code. (Line numbers are included for reference only.) 

You need to ensure that Counter1 is available for use in Windows Performance Monitor (PerfMon). 

Which code segment should you insert at line 16? 

A. CounterType = PerformanccCounterType.RawBase 

B. CounterType = PerformanceCounterType.AverageBase 

C. CounterType = PerformanceCounterType.SampleBase 

D. CounterType = PerformanceCounterType.CounterMultiBase 

Answer: C 

Explanation: 

PerformanceCounterType.SampleBase - A base counter that stores the number of sampling interrupts taken and is used as a denominator in the sampling fraction. The sampling fraction is the number of samples that were 1 (or true) for a sample interrupt. Check that this value is greater than zero before using it as the denominator in a calculation of SampleFraction. 

PerformanceCounterType.SampleFraction - A percentage counter that shows the average ratio of hits to all operations during the last two sample intervals. Formula: ((N 1 - N 0) / (D 1 - D 0)) x 100, where the numerator represents the number of successful operations during the last sample interval, and the denominator represents the change in the number of all operations (of the type measured) completed during the sample interval, using counters of type SampleBase. Counters of this type include CachePin Read Hits %. http://msdn.microsoft.com/en-us/library/system.diagnostics.performancecountertype.aspx 

Q93. - (Topic 2) 

You are developing an application that will process personnel records. 

The application must encrypt highly sensitive data. 

You need to ensure that the application uses the strongest available encryption. 

Which class should you use? 

A. System.Security.Cryptography.DES 

B. System.Security.Cryptography.Aes 

C. System.Security.Cryptography.TripleDES 

D. System.Security.Cryptography.RC2 

Answer: B 

Q94. - (Topic 2) 

You plan to store passwords in a Windows Azure SQL Database database. 

You need to ensure that the passwords are stored in the database by using a hash algorithm, 

Which cryptographic algorithm should you use? 

A. ECDSA 

B. RSA-768 

C. AES-256 

D. SHA-256 

Answer: D 

Q95. - (Topic 1) 

You are creating an application that manages information about zoo animals. The application includes a class named Animal and a method named Save. 

The Save() method must be strongly typed. It must allow only types inherited from the Animal class that uses a constructor that accepts no parameters. 

You need to implement the Save() method. Which code segment should you use? 

A. Option A 

B. Option B 

C. Option C 

D. Option D 

Answer: C 

Explanation: 

When you define a generic class, you can apply restrictions to the kinds of types that client code can use for type arguments when it instantiates your class. If client code tries to instantiate your class by using a type that is not allowed by a constraint, the result is a compile-time error. These restrictions are called constraints. Constraints are specified by using the where contextual keyword. http://msdn.microsoft.com/en-us/library/d5x73970.aspx 

Q96. - (Topic 2) 

You are implementing a new method named ProcessData. The ProcessData() method calls a third-party component that performs a long-running operation. 

The third-party component uses the IAsyncResult pattern to signal completion of the long-running operation. 

You need to ensure that the calling code handles the long-running operation as a System.Threading.Tasks.Task object. 

Which two actions should you perform? (Each correct answer presents part of the solution. Choose two.) 

A. Call the component by using the TaskFactory.FromAsync() method. 

B. Create a TaskCompletionSource<T> object. 

C. Apply the async modifier to the method signature. 

D. Apply the following attribute to the method signature: [MethodImpl(MethodImplOptions.Synchronized)] 

Answer: A,B 

Explanation: A: TaskFactory.FromAsync Method 

Creates a Task that represents a pair of begin and end methods that conform to the 

Asynchronous Programming Model pattern. Overloaded. 

Example: 

TaskFactory.FromAsync Method (IAsyncResult, Action<IAsyncResult>) 

Creates a Task that executes an end method action when a specified IAsyncResult 

completes. 

B: In many scenarios, it is useful to enable a Task<TResult> to represent an external asynchronous operation. TaskCompletionSource<TResult> is provided for this purpose. It enables the creation of a task that can be handed out to consumers, and those consumers can use the members of the task as they would any other. However, unlike most tasks, the state of a task created by a TaskCompletionSource is controlled explicitly by the methods on TaskCompletionSource. This enables the completion of the external asynchronous operation to be propagated to the underlying Task. The separation also ensures that consumers are not able to transition the state without access to the corresponding TaskCompletionSource. 

Note: 

* System.Threading.Tasks.Task Represents an asynchronous operation. 

Q97. - (Topic 2) 

You are developing an application that will be deployed to multiple computers. You set the assembly name. 

You need to create a unique identity for the application assembly. 

Which two assembly identity attributes should you include in the source code? (Each correct answer presents part of the solution. Choose two.) 

A. AssemblyDelaySignAttribute 

B. AssemblyCompanyAttribute 

C. AssemblyProductAttribute 

D. AssemblyCultureAttribute 

E. AssemblyVersionAttribute 

Answer: D,E 

Explanation: The AssemblyName object contains information about an assembly, which 

you can use to bind to that assembly. An assembly's identity consists of the following: 

Simple name. 

Version number. 

Cryptographic key pair. 

Supported culture. 

D: AssemblyCultureAttribute 

Specifies which culture the assembly supports. 

The attribute is used by compilers to distinguish between a main assembly and a satellite 

assembly. A main assembly contains code and the neutral culture's resources. A satellite 

assembly contains only resources for a particular culture, as in 

[assembly:AssemblyCultureAttribute("de")] 

E: AssemblyVersionAttribute 

Specifies the version of the assembly being attributed. 

The assembly version number is part of an assembly's identity and plays a key part in 

binding to the assembly and in version policy. 

Q98. - (Topic 2) 

You are developing an application that uses multiple asynchronous tasks to optimize performance. 

You need to retrieve the result of an asynchronous task. 

Which code segment should you use? 

A. Option A B. Option B 

C. Option C 

D. Option D 

Answer: C 

Q99. - (Topic 2) 

You are implementing a method named ProcessData that performs a long-running task. The ProcessData() method has the following method signature: 

public void ProcessData(List<decimal> values, CancellationTokenSource source, CancellationToken token) 

If the calling code requests cancellation, the method must perform the following actions: 

. Cancel the long-running task. 

. Set the task status to TaskStatus.Canceled. You need to ensure that the ProcessData() method performs the required actions. 

Which code segment should you use in the method body? 

A. if (token.IsCancellationRequested) return; 

B. throw new AggregateException(); 

C. token.ThrowIfCancellationRequested(); 

D. source.Cancel(); 

Answer: C 

Q100. - (Topic 1) 

You are developing an application that will transmit large amounts of data between a client computer and a server. 

You need to ensure the validity of the data by using a cryptographic hashing algorithm. 

Which algorithm should you use? 

A. HMACSHA256 

B. RNGCryptoServiceProvider 

C. DES 

D. Aes 

Answer: A 

Explanation: 

The .NET Framework provides the following classes that implement hashing algorithms: 

HMACSHA1. 

MACTripleDES. 

MD5CryptoServiceProvider. 

RIPEMD160. 

SHA1Managed. 

SHA256Managed. 

SHA384Managed. 

SHA512Managed. 

HMAC variants of all of the Secure Hash Algorithm (SHA), Message Digest 5 (MD5), and 

RIPEMD-160 algorithms. 

CryptoServiceProvider implementations (managed code wrappers) of all the SHA 

algorithms. 

Cryptography Next Generation (CNG) implementations of all the MD5 and SHA algorithms. 

http://msdn.microsoft.com/en-us/library/92f9ye3s.aspx#hash_values