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NEW QUESTION: 1
Which two reductions are the correct reductions of the IPv6 address 2001:0d02:0000:0000:0014:0000:0000:0095? (Choose two)
A. 2001:d02::14::95
B. 2001:d02:0:0:14::95
C. 2001:d02::14:0:0:95
D. 2001:0d02:::0014:::0095
Answer: B,C
Explanation:
We can't use triple colons (:::) in IPv6 presentation. Also We can't use double colons (::) twice.
You can use it only once in any address because if two double colons are placed in the same address, there will be no way to identify the size of each block of 0s. Remember the following techniques to shorten an IPv6 address:
- Omit leading 0s in the address field, so :0000 can be compressed to just :0 and :0d02 can be com-pressed to :d02 (but :1d00 can not be compressed to :1d)
- Use double colons (::), but just once, to represent a contiguous block of 0s, so 2001:0d02:0000:0000:0014:0000:0000:0095 can be compressed to 2001:0d02::14:0:0:95 or 2001:0d02:0:0:14::95

NEW QUESTION: 2
You are designing a Windows application by using Microsoft .NET Framework 4 and Microsoft Visual Studio 2010. The business logic layer of the application is implemented by using Windows Communication Foundation (WCF).
You create a duplex bidirectional WCF service that contains a single operation. The service operation sends the result back to the client application by using a two-way callback operation.
You plan to design a service interaction strategy.
You need to ensure that deadlocks are prevented.
What should you do?
A. Configure the CallbackBehaviorAttribute attribute to use the Synchronization context in the callback class.
B. Configure the ServiceBehaviorAttribute attribute to use the Reentrant or Multiple concurrency mode in the service class.
C. Configure the CallbackBehaviorAttribute attribute to use the Reentrant or Multiple concurrency mode in the callback class.
D. Configure the ServiceBehaviorAttribute attribute to use the Synchronization context in the service class.
Answer: B
Explanation:
B Explanation Esta pregunta puede que le falte informacion. La pregunta se ve desde el lado del cliente. es decir ServiceBeahviourAttribute. y como es el unico que tiene una propiedad se acepta.
El callbackbehaviour sera del lado del WS.
Explanation/Reference:
Designing Concurrency for Web Services You can control whether WCF Web Services are single-threaded or multithreaded. If they are multithreaded, you have to plan to write code to perform locking and to work around deadlock conflicts. Two factors determine whether a WCF web service is single-threaded or multithreaded: instancing and concurrency. Instancing (defined by the ServiceBehavior attribute's Instance ContextMode property) defines the conditions in which WCF creates a new process: ** Single WCF uses a single instance for the web service, regardless of the number of calls or users. ** PerSession WCF uses a separate instance for each user session, which means that each user gets his own instance unless a user creates multiple sessions.
** PerCall WCF uses a separate instance for each call, which might mean that multiple instances are created for a single user. For each instance mode, WCF Web Services support three different concurrency modes (defined by the ServiceBehavior attribute' ConcurrencyMode property for inbound connections, or the CallbackBehavior attribute' ConcurrencyMode property for callbacks): ** Single Each instance context is allowed to have a maximum of one thread processing messages in the instance context at a time. Other threads will be blocked until they time out or the thread completes, but you do not have to write code to deal with threading issues. ** Multiple Each service instance can have multiple threads processing messages concurrently. You must create a thread-safe service to use the Multiple concurrency mode. ** Reentrant Each service instance processes one message at a time, but accepts re-entrant operation calls. The service accepts these calls only when it is calling out through a WCF client object. The Reentrant concurrency mode is only relevant for PerSession instancing. If you set InstanceContextMode to Single and ConcurrencyMode to Single, the web service always will be single-threaded, messages always will be processed in the order that they are Objective 3.5: Design for a Concurrent Multiuser Environment Chapter 3 207 received, and there never will be any risk of concurrency problems. However, there could be performance problems because the web service will wait until one request is complete before processing another request.

NEW QUESTION: 3
ある会社には、オンプレミスとAmazonEC2インスタンスの両方で実行されるWebアプリケーションがあります。
時間の経過とともに、オンプレミスサーバーとEC2インスタンスの両方がクラッシュし始めます。 SysOps管理者は、アプリケーションのメモリリークを疑っており、時間の経過とともにメモリ使用率を監視するための統一された方法を望んでいます。
管理者は、EC2メモリ使用率とオンプレミスサーバーメモリ使用率の両方を経時的に追跡するにはどうすればよいですか？
A. オンプレミスサーバーとEC2インスタンスの両方にトラフィックをルーティングするようにロードバランサーを設定してから、CloudWatchをロードバランサーのメトリクスの統合ビューとして使用します。
B. Amazon EC2インスタンス用のCloudWatchエージェントを使用して、メモリ使用率をCloudWatchに報告し、通知のCloudWatchアラームを設定します。オンプレミスサーバーにはサードパーティのアプリケーションを使用します。
C. AmazonEC2インスタンスとオンプレミスサーバーの両方にAmazonCloudWatchエージェントを使用して、MemoryUtilizationメティックをCloudWatchにレポートし、通知用にCloudWatchアラームを設定します。
D. スクリプトを作成するか、サードパーティのアプリケーションを使用して、EC2インスタンスとオンプレミスサーバーの両方のメモリ使用率を報告します。
Answer: C
Explanation:
https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/metrics-collected-by- CloudWatch-agent.html