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Ethernet is a networking standard that has been around since the mid 1970s when Xerox introduced the first Ethernet product. Ethernet is a network standard that is defined by the Institute of Electrical and Electronics Engineers (IEEE) 802.3 specification. It has been and continues to be overwhelmingly popular. In fact, most home and small office networks are Ethernet networks, and the vast majority of larger networks use Ethernet as well. For this reason, most NICs and networking equipment, except for more specialized networks like HomePNA and wireless, use the Ethernet standard. Even wireless networks use a form of Ethernet. When you set out to connect a group of computers using NICs, a hub, and RJ-45 cables, you are creating an Ethernet network. So, what is Ethernet exactly Ethernet is a set of specifications that define how the hardware used to create a network communicates and functions. For this reason, you can use network adapter cards created by different manufacturers and even a network hub created by yet another manufacturer, and all of the components will work together. Manufacturers adhere to the Ethernet 802.3 specification so that you can mix and match hardware without problems. If you want to read about the 802.3 specification, you can find it using a quick search on the Internet, but the rest of this section highlights the pertinent information. In fact, you ll find a few terms and concepts that you might also see listed on manufacturers Ethernet documentation and packaging.

5. If, after these four seconds, the resolver does not receive a response from any server, it sends the query to all DNS servers on all adapters still under consideration and waits eight seconds for a response. 6. If the resolver receives a positive response within that time, it stops querying for the name, adds the response to the cache, and returns the response to the client.

Check cache (Hosts file is preloaded into cache).

Query first server on all adapters still under consideration. No No Positive Negative response response Yes Yes received returned within two seconds Adapter removed from consideration. Yes Any adapters No still under consideration D Return to flowchart DNS Name Resolution. 3

3

Figure 24-9

24:

3. Select the Projects tab, and then select the MyLibrary project, which contains the managed DLL. Click OK to add the reference to your project. Because the DLL is in the same solution and you just added a reference to that DLL to your application, Microsoft Visual Studio now knows there is a dependency between the two and will always build the DLL first so that your application builds the executable with the most up-to-date DLL possible. You can verify that the reference has been inserted by using the following technique: in Solution Explorer, expand the References node, and look for the MyLibrary reference. Click it to see the details in the Properties window. By default, when you create a Windows Forms project, plenty of references are automatically added to the project during its creation. Figure 7-2 shows the references and Properties window for information pertinent to MyLibrary. When you re done adding the reference, your application can create instances of the new types that are built in the DLL and use them appropriately. The build process (the compiler and linker) will now accept the use of those new types; however, for Visual Studio to have those new types available via IntelliSense and for the compiler to know about those new types, one more step is required. You might already have seen the line of code in the TestApplication.cs file that reads using MyLibrary;. You create a using directive to use the types in a namespace Figure 7-2 All references for this project without having to specify the fully qualified namespace name.