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The Ping command is used to test communication between one computer and another; Tracert is used to follow a particular route from one computer to another. The Pathping command is a combination of both Ping and Tracert, displaying information about packet loss at every router between the host computer and the remote one. The Pathping command provides information about data loss between the source and the destination, allowing you to determine which particular router or subnet might be having network problems. To use the Pathping command, at the command prompt, type pathping followed by the target name or IP address.

Wingtip Toys is expanding their sales operation and plans to open a new call center, which requires 100 new Windows 7 workstations. At the latest deployment project planning session, the IT director placed you in charge of the stabilization team responsible for testing the new workstations prior to their deployment on the production network. To help you organize and lead the workstation stabilization effort, the IT director suggests that you read the Stabilize SMF from Microsoft Operations Framework 4.0. This document is available online at http://technet.microsoft.com/en-us/library/cc543320.aspx. The call center users have a limited set of tasks that they are required to perform, so their workstations are relatively simple. All of their database entry screens are exposed through Microsoft Internet Explorer, and the users do not require Microsoft Office or any other outside applications. To keep the users focused, the functional specification for the workstations calls for a limited interface, locking the users out of the Windows 7 features they do not need.

The Windows Help And Support Center offers a list of all of the commands that you can perform by using the command line. Search for Command-Line Reference A Z. Each command reference includes a description of the command and how to use it.

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Configuring and Troubleshooting TCP/IP 13-17

The TCP/IP suite of protocols provides a set of standards for how operating systems and applications communicate and how networks are interconnected. The TCP/IP suite of protocols maps to a four-layer conceptual model known as the Department of Defense (DoD) model. The four layers are as follows:

Named queries don t have to be HQL or JPA QL strings; they may even be native SQL queries and your Java code doesn t need to know the difference:

Network access layer The network access layer is responsible for placing data on the network medium and receiving data off the network medium. This layer contains physical devices such as network cables and network adapters. Internet layer The Internet layer is responsible for addressing, packaging, and routing the data that is handed down to it from the transport layer. There are four core protocols in this layer: IP, Address Resolution Protocol (ARP), Internet Control Message Protocol (ICMP), and Internet Group Management Protocol (IGMP). Transport layer The transport layer protocols provide communication sessions between computers. The desired method of data delivery determines the transport protocol. The two transport layer protocols are TCP and User Datagram Protocol (UDP). Application layer At the top of the model is the application layer, in which applications gain access to the network. There are many standard TCP/IP tools and services in the application layer, such as File Transfer Protocol (FTP), Telnet, Simple Network Management Protocol (SNMP), DNS, and so on.

The purpose of this layering is to provide a level of abstraction between an application or protocol in one layer and the functioning of the entire network. For example, an application in the application layer needs to know only where to pass information into the transport layer (and how to format that information); it does not need to take into account any specific network configuration beyond that point. Packets of data are passed down the layers on the sending host and back up the layers on the receiving host. If you are interested in learning more about how layering works, you should view two multimedia presentations: OSI Model and TCP/IP Protocol Suite. Both presentations are available in the Multimedia folder on the CD-ROM accompanying this book.

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