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您编写一个名为Employee的类，该类包含以下代码段。您需要在类型库中向COM公开此类。COM接口还必须便于在Employee类的新版本之间保持向前兼容。您需要选择方法以生成COM接口。您应该怎么做？（）

A
B
C
D

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Which of the following statements are true regarding Layer 3 switches？（Choose all that apply.）（）

A routed port does not run STP or DTP
B. A routed port is considered to be in a down state if it is not operational at both Layer 1 andLayer 2
C. An SVI is considered to be in a down state if it is not operational at both Layer 1 and Layer 2
D. An SVI is considered to be in a down state only when none of the ports in the correspondingVLAN are active
E. An SVI port does not run 5TP or DTP
F. To create a trunk， an SVI can be logically divided into subinterfaces

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You work in a company which is named Wiikigo Corp. The company uses SQL Server 2008. You are the administrator of the company database. Now you are in charge of a SQL Server 2008 instance. On two cluster-ready nodes, you intend to perform an installation of a SQL Server 2008 mission-critical cluster. Constant availability is needed by the mission-critical cluster. You have to configure the SQL Server cluster to failover and reduce the service disruption to the least. Which failover option should you use?（）

A. You should allow failback only during non-business hours
B. You should immediately allow failback
C. You should prevent automatic failback
D. You should allow failback only during business hours

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Youhaveaserverthatrunswindowsserver2008.YouneedtopreventtheserverfromestablishingcommunicationsessionstoothercomputersbyusingTCPport25.Whatshouldyoudo?（）

A. Fromwindowsfirewall,addanexception.
B. Fromwindowsfirewallenabletheblockallincomingconnectionsoption.
C. Fromthewindowsfirewallwithadvancedsecuritysnap-in,createaninboundrule.
D. Fromthewindowsfirewallwithadvancedsecuritysnap-in,createanoutboundrule.

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You work in a company which is named Wiikigo Corp. The company uses SQL Server 2008. You are the administrator of the company database. Now you are in charge of a SQL Server 2008 instance. There is a database named Dworks in the instance. The Dworks database has the Products table. Now you have to replicate the Products table to the SQL Server instances at remote locations, so you create a Merge Replication topology and a Publication to do this. ThePublication has a 21-day retention period. There is a user who goes on a business trip, 30 days later he comes back and finds that data in his database is not the latest. The Windows Event log states the following error message: "Replication: expired subscription dropped." You must get the latest data in the user's database and make sure that future data changes are appropriately replicated. So what action should you perform to achieve this goal? （）

A. You should recreate the publication
B. You should upload unsynchronized changes.
C. You should reinitialize the publication and generate a new snapshot at once.
D. You should upload unsynchronized changes, and then reinitialize the publication

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您编写一个名为Employee的类，该类包含以下代码段。 您需要在类型库中向COM公开此类。COM接口还必须便于在Employee类的新版本之间保持向前兼容。 您需要选择方法以生成COM接口。您应该怎么做？（）

A B C D

Which of the following statements are true regarding Layer 3 switches？（Choose all that apply.）（）

Youhaveaserverthatrunswindowsserver2008.YouneedtopreventtheserverfromestablishingcommunicationsessionstoothercomputersbyusingTCPport25.Whatshouldyoudo?（）

您编写一个名为Employee的类，该类包含以下代码段。您需要在类型库中向COM公开此类。COM接口还必须便于在Employee类的新版本之间保持向前兼容。您需要选择方法以生成COM接口。您应该怎么做？（）

A
B
C
D