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We started customizing the contract when changing the name of IService1 to ICustomerService, but we need to continue by defining the methods that will become part of the CustomerService contract: GetCustomers, GetCustomer, InsertCustomer, UpdateCustomer, and DeleteCustomer In practice, there will be more methods you ll want, just to customize the contract for the special needs of your application, but these methods depict typical scenarios you ll frequently encounter and are representative of any work you ll perform Listing 11-2 shows the modifications to ICustomerService to support customer operations After making the changes in Listing 2, your application won t compile until you implement the ICustomerService interface in the next section Please make the changes, if you re following along, and keep reading until the next section

CMOS If you ve got power (you see an LED lit up, for example), then check CMOS to see if the hard drive shows up Operating system If you have some life in the PC, but get no boot option, then try booting to the CD and running the recovery console Check to see if you can access the hard drive If you have a boot option, then try booting to Safe mode or Last Known Good Configuration

Fiber Distributed Data Interface (FDDI) is a 100-Mbps protocol that runs over fiber-optic cable media Like Token Ring, FDDI uses a token-passing architecture to control media access, yielding high effective bandwidth from its 100-Mbps wire speed You may still see it from time to time, mostly in the datacenter FDDI s architecture made it attractive for use as backbone LANs, especially for office campuses and other large-area applications FDDI uses dual rings to provide additional reliability because of their redundant paths The secondary ring goes into action when the primary ring fails As Figure 4-5 shows, FDDI isolates the damaged station by wrapping around to the secondary ring and looping back in the other direction thus keeping the ring intact NOTE You might also use Copper Distributed Data Interface (CDDI) This technology works the same way as FDDI, but as you might gather from the name, it does so over copper cabling, not fiber optic

[ServiceContract] public interface ICustomerService { [OperationContract] Customer GetCustomer(int custID); [OperationContract] List<Customer> GetCustomers(); [OperationContract] int InsertCustomer(Customer cust); [OperationContract] void UpdateCustomer(Customer cust); [OperationContract] void DeleteCustomer(int custID); }

By breaking the problem into discrete chunks, you make a big problem more manageable You can determine whether the problem is caused by a hardware failure, connection problem, or perhaps an issue with the operating system or other software

When an IP message travels across a network, it does so using one of two transport protocols: TCP or UDP As mentioned, TCP stands for Transmission Control Protocol and is the first half of the TCP/IP acronym UDP stands for User Datagram Protocol and is used in place of TCP for less-critical messages Either protocol serves to transport messages as needed through TCP/IP networks There is a major difference between the functionality of TCP and UDP messages, however: TCP is called a reliable protocol because it checks with the receiver to ensure that the packet was received UDP is called an unreliable protocol because no effort is made to check with the receiver and verify delivery

Once you determine what might have caused the problem, test your theories The testing procedure follows a simple set of rules: First, check the easy stuff Is the failed device plugged in Is it turned on Does the printer have paper Second, use a process of elimination to home in on the problem Use a notepad to write down what you ve tried and what effect that effort had Do one thing at a time If you go into CMOS and make a whole series of changes to various settings, for example, and then the computer works, how do you know what was wrong You can t know when you make multiple changes Worse yet, you risk breaking something else while fixing the first problem!

<ServiceContract()> Public Interface ICustomerService <OperationContract()> Function GetCustomer(ByVal custID As Integer) As Customer <OperationContract()> Function GetCustomers() As List(Of Customer)

The important thing to remember is that only one transport protocol can be used to manage a message For instance, if you download a web page, the packets are managed by TCP On the other hand, a Trivial File Transfer Protocol (TFTP) upload or download is accomplished via the UDP protocol

Mike Meyers CompTIA A+ Guide: PC Technician (Exams 220-602, 220-603, & 220-604)

Third, if hardware seems to be the problem, swap out the suspect parts with known good parts from your stash of FRUs With a dead or dying piece of hardware, you can generally get almost immediate results A fried stick of RAM, for example, can create a dead PC Pop in a good stick, and you ll have a functional machine

<OperationContract()> Function InsertCustomer(ByVal cust As Customer) As Integer <OperationContract()> Sub UpdateCustomer(ByVal cust As Customer) End Interface

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