A new asynchronous connection is

You connect your computer to a wireless network. You discover that this new connection fails to show in the Connect to a network window.You need to view this connection in the Connect to a network window.What should you do?（）

A.A

B.B

C.C

D.D

A. PPP and ATM

B. PPP and SDLC

C. ATM and HDLC

D. SDLC and HDLC

A Windows Communication Foundation (WCF) solution exposes the following contract over an HTTP connection.[ServiceContract]public interface IDataService{ [OperationContract] string GetData();}Existing clients are making blocking calls to GetData. Calls to GetData take five seconds to complete.You need to allow new clients to issue non-blocking calls to get the data, without breaking any existing clients. What should you do?（）

A.

B.

C.Generate a proxy class with asynchronous methods and use it for the new clients

D. Add a new endpoint to the service that uses a full-duplex binding and use it for the new clients.

ATM(Asynchronous Transfer Mode) technology combines connection oriented mechanism and (72) mechanism

A.circuit switching

B.packet switching

C.message switching

D.voice switching

An administrator has an existing HMC and POWER6 570 connected to a network switch. The administrator is planning to install two POWER6 570s with a dedicated HMC.Which infrastructure is required for the new HMC?（）

A.An additional switch for the new HMC

B.Asynchronous adapters on the new HMC

C.The two 570 servers are directly connected to the new HMC

D.One 570 is directly connected to the new HMC and the other is directly connected to the existing HMC