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Datagrams and packets are easily confused: A datagram is a unit of data, whereas a packet is the physical message entity (created at levels 3 and up) that actually passes through a network Although the terms are used interchangeably (like engine and motor ), they really are two different things but we don t need to bore you with anything other than a high-level explanation The important thing to note here is that messages are broken into pieces, sent across the network, and then reassembled at the receiving station

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A computer tech must bring integrity to his or her job, just like any other service professional Treat anything said to you as a personal confidence, not to be repeated to coworkers or bosses Respect the privacy and property of the user You have a lot of power when you sit in front of someone s computer You can readily read private e-mail, discover Web sites surfed, and more With a click of the Start button, you can know the last five programs the user ran, including Word and Solitaire, and the last few documents he or she worked on Don t do this You really don t want to know! Plus, if you get caught violating a customer s privacy, you ll not only lose credibility and respect, you could lose your job Passwords are a big issue for techs We have to reboot computers and access shares and other jobs that require passwords The rule here is to avoid learning other folks passwords at all costs If you know a password to access a mission-critical machine, and that machine ends up compromised or with data missing, who might be blamed You, that s who, so avoid learning passwords! If you only need a password once, let the user type it in for you If you anticipate accessing something multiple times (the more usual situation), ask the user to change his or her password temporarily It s funny, but people assume ownership of things they use at work John in accounting doesn t call the computer he uses anything but my PC The phone on Susie s desk isn t the company phone, it s Susie s phone Regardless of the logic or illogic involved with this sense of ownership, a tech needs to respect that feeling You ll never go wrong if you follow the.

The IService1cs (IService1vb in VB) class in Figure 11-1 contains an interface As you learned in 4, interfaces define a set of members that do not have implementations The actual implementation will be provided by classes that implement the interface You can consider the interface to be a contract that guarantees a set of operations for a service In addition to the interface, the types associated with the service are part of the service contract The contract is important because when you write code that uses the Web service, it is the contract that your code will see and everything that is not in the contract will not be visible Any application wishing to use a Web service will make calls to the Web service based on what is specified in the contract In this section, you ll see how to define a WCF contract with an interface, built-in types, and custom types Later sections will show how to implement and consume the contract, bringing the importance of the contract full circle so that you can see how the contract is defined, implemented, and consumed