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A demilitarized zone (DMZ) is a perimeter network, or a network area that sits outside an organization s internal network A DMZ is used to hold public-facing servers that need to be accessible to the Internet, and are therefore more likely to face attacks The purpose of this is to mitigate the damage should one of these hosts be compromised Important or sensitive information should never be kept in a DMZ On consumer-grade routers, a DMZ typically refers to an address to which all suspect traffic is forwarded In home environments, the DMZ is often configured incorrectly We often find that it is used to forward all traffic to a specific address, rather than researching which ports need to be accessible for each service and only forwarding that traffic to the DMZ.

From the Visual C# Items Data templates, select ADO.NET Entity Data Model. Select Generate from database to create the model from our existing tables. Click Next. Either choose an existing connection to your database or create a new connection. If you are creating a new connection, you will need to select your database server, your authentication method (Windows or SQL Server), and the database. Once you have selected these, it s a good idea to click Test Connection to be sure the connection is ready to go. Once you have tested the connection, click Next. The next dialog box shows all the tables, views, and stored procedures in the database. Check the items you want to include in the model. We want to select all the tables (Meter, Poem, and Poet). We also want to select the view (vwLibrary). For now, leave the two check boxes for pluralizing and including foreign key columns selected. We ll talk more about them in a minute. Figure 2-8 shows the things we ve selected.

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The parameters include the following options. -r {Directory}: Recursively search a directory for COD files to sign. -f {File}: Read the COD files to sign from the provided file. -d: Delete the file passed with the f command. -a: Automatically request signatures. -p {Password}: Password for code signing requests. -s: Show statistics about signatures requested and received. -c: Close the window after successfully requesting signatures. -C: Always close window after requesting signatures.

This becomes a big security threat to the computer or network device that has all the traffic forwarded to it Whether you choose to use a DMZ is dependent not on the size of your company, but on whether you are using protocols that you think might easily be compromised For example, FTP is not a secure protocol Relegating the use of FTP in your environment to a system that lives outside your local network would prevent standard FTP attacks from affecting the entire network infrastructure Some administrators might choose to use a second subnet instead of a DMZ to keep certain types of traffic separate from the primary network Subnetting an IP network allows a single large network to be broken down into what appears (logically) to be several smaller ones.

Figure 2-8. Selecting the tables and view to include in our model. Leave the Pluralize or singularize generated object names and Include Foreign Key Columns in the Model checked. When you click Finish, the wizard will create a new model with our three tables and the view. The wizard will also read the foreign key constraints from the database and infer a one-to-many relationship between Poet and Poem(s) as well as a one-to-many relationship between Meter and Poem(s). Figure 2-9 shows the new model created for us by including the Poet, Poem, and Meter tables as well as the vwLibrary view.

Armed with knowledge of how the BlackBerry toolchain works, you can set up automated builds. These will greatly increase your productivity. Rather than needing to open Eclipse, navigate to a particular project workspace, switch to the proper version of

Devices on the same subnet have the same subnet mask, a number that determines which part of an address signifies the network range, and which signifies the hosts in that range Rather than allowing your users to see one another, you could put them on separate subnets and not allow UDP traffic to pass across the various subnets implemented in your environment It is even possible to split a network into multiple subnets Keep in mind, however, that the more complex the subnetting gets, the more difficult it becomes to troubleshoot problems on the network For example, when a wireless network is introduced into an environment, and a separate wireless subnet is created, wireless users may have difficulty automatically finding printers on the main network The printers will need to be manually installed using their IP address..

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