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Lesson 4
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1. Correct Answer: A A. Correct: To help ensure that a WCF application is as efficient as possible by default, performance counters are turned off unless explicitly enabled in the configuration file. B. Incorrect: The WCF performance counters are instance based. This means that to be captured, an instance of the service must be running. If there is no service, no counters are updated.
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C. Incorrect: WCF performance counters are instance based at the address and contract level. The name of the instance under which the counters are accumulated uses the address and contract as the distinguishing characteristics. This means that if multiple bindings share address and contract, the counters will be incremented within that single instance. D. Incorrect: None of the WCF performance counters relate to the client side at all. They are all service-side counters. 2. Correct Answer: A A. Correct: It is quite legitimate for a WCF service that is running as a Local Service to publish WMI events. B. Incorrect: The specified registry key is used to update the memory allocated to the performance counter updates in WCF. The key has nothing to do with WMI. C. Incorrect: To publish WMI information, the wmiProviderEnabled attribute must be set to true. D. Incorrect: The WMI infrastructure is designed to allow for remotely monitoring an application. This ability is one reason care should be taken in enabling WMI event publication on an application.
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6: Case Scenario Answers
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Case Scenario: Using Activity Tracing
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1. The answer to this question depends on whether you want the clients to be able to submit information that might be useful in identifying the source of problems. Activity tracing is useful when trying to correlate client actions with service actions. To do this, trace logs must be generated by both the client and the service. If the client application is deployed at another site, you need to provide a mechanism that enables the trace logs from the client portion of the application to be sent in. As for whether allowing this tracing to be performed is a good idea, the answer is almost inevitably yes. Problems are quite likely to be associated with the communications between the two pieces. Being able to correlate the traces will frequently be beneficial to the support staff, and it could very well help the development team identify bugs that would otherwise be difficult to track down. 2. An activity can be defined from either the business or technical perspective. The choice depends on the type of correlation needed. To debug a technical problem, creating a new activity with each call is a good idea. To address business-level issues, keeping track of the multiple calls within a business transaction might be effective. Ultimately, the decision about when a new activity should be created will depend on how the information is expected to be used.
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7: Lesson Review Answers
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Lesson 1
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1. Correct Answer: C A. Incorrect: One of the differences between transport- and message-level security is that transport encrypts the entire message. The encryption and decryption of the message in transport-level security takes place below the WCF channel stack, so there is no need to leave any portion of the message unsecured. B. Incorrect: Transport security is dependent upon the capability of the underlying protocol. If the protocol doesn t support the security mechanism, WCF transport security can be configured to use it. C. Correct: If the transport security is built into the protocol, there is no way for WCF to turn it off. It s not possible to disable transport security in an SSL-based connection, for example. D. Incorrect: Message integrity is one of the guarantees offered by transport-level security. 2. Correct Answer: C A. Incorrect: The basicHttpBinding provides transport-level security using SSL. B. Incorrect: The netTcpBinding provides transport-level security, although the implementation is done within WCF instead of using SSL. C. Correct: The wsDualHttpBinding doesn t support transport-level security because there is no way to guarantee that the client is capable of receiving an SSL-encrypted message. D. Incorrect: The netNamedPipeBinding supports the same transport-level security options that TCP does because the implementation for the security takes place within the WCF channel. 3. Correct Answer: D A. Incorrect: The wsHttpBinding can use SSL as the transport security mechanism, a technique that does not require AD DS to function. B. Incorrect: The netNamedPipeBinding uses named pipes, a transport protocol that is not intended to be used in cross-machine applications. C. Incorrect: The netTcpBinding uses a WCF implementation of transport security that is not dependent on AD DS. In fact, netTcpBinding is capable of using a custom authentication mechanism as part of transport security. D. Correct: For msmqIntegrationBinding to implement transport security, both client and service must be in the same domain. Clients and services in the same domain in a Windows network require AD DS.
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