A comedian has rehearsed 10 different jokes. During a given act, he performs any 5 of these jokes. How many different acts can he perform assuming the order of the jokes in an act is not important?

The system has been designed to give students quick and easy to the digital resources of the library.

You notice that the performance of your production 24/7 Oracle database significantly degraded.Sometimes you are not able to connect to the instance because it hangs. You do not want to restart thedatabase instance.How can you detect the cause of the degraded performance?（）

【A popular service that has attercted the interest of companies and has home users alike is the sending of voice signals over an IP-based network, such as the Internet. The practice of making telephone calls over the internet has had a number of different names, including packet voice, voice over packet, voice over the internet, internet telephone, and Voice over Ip（Voip）. But it appears the industry has settled on the term”Voice ove IP” in reference to the internet protocol, which controls the transfer of data over the internet. There are currently three ways to deliver VoIp to users, the first technique is found at the corporate level. Many companies are offering VoIP systerms that operate over a local area network. These systems involve a fair amount of equipment, such as VoIP servers, special IP-enabled telephones, and routers that can direct telephone calls. Today a large portion of corporate sites have converted their older internal telephone systems to VoIP systems that opreate over a LAN, thus converging two systems into one. A second common solution is the one often encountered at home. Using existing telephones, a special converter is added between the telephone and a high speed internet（DSL or cable modem）connection. The converter digitizes the voice signal and creates a stream of packets that are then sent over an ip connection.The third technique involves smart cell phones. Never cell technologies are all packet-based, thus requiring a telephone call to be converted to digital packets and sending those packets over IP networks.】

A process of comparing the actual performance of a machine with the intended performance, and the adjusting the machine to reduce and eventually eliminate the difference between the actual and intended performance is called（）

The performance of the contracted product should be （） the technical specifications stipulated in the contract.

A process of comparing the actual performance of a machine with the intended performance, and the adjusting the machine to reduce and eventually eliminate the difference between the actual and intended performance is called（）

One of your customers wishes to use the NAS to perform DHCP functions and does not currently have a Layer 3 gateway in its production network. Which gateway mode is appropriate for this customer?（）

The data to be recorded on this sheet （） the performance of the engine.

Transport gateways connect byte streams in the transport layer. Application gateways allow interworking above

●Transport gateways connect byte streams in the transport layer．Application gateways allow interworking above (72) ．

Which three characteristics are true of the ProtectLink Gateway product?（）