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RAID solutions: Redundant array of independent disks (RAID) is the concept of storing redundant data on additional drives in case one drive in the RAID solution should fail RAID solutions can apply to hardware or software The hardware solution involves having a RAID controller that controls the RAID array, whereas in a software solution the RAID solution is managed by software such as the network operating system The software solutions are cheaper, but the hardware solutions offer better performance and are more exible For more information on RAID volumes, refer to 10 Power: A number of network devices such as servers support a fault-tolerant power source such as a power supply in case the original power supply fails Network link: In a number of networking environments a fault-tolerant network link is created to ensure that one network location can communicate with another location at all times or that there is a constant connection to the WAN environment or Internet A number of business applications require a network link at all times; therefore, when you design the network infrastructure you should decide whether the organization requires a fault-tolerant network link

Use the Device Emulator Manager (dvcemumanagerexe) for choosing between images and controlling image power on/power off state (see Figure 4-3) This tool is installed with the emulator and can control all the currently installed images Images can be started, stopped, and cradled from within this tool There is also a command-line tool (DeviceEmulatorexe) for controlling individual images; this executable is installed in the emulator s program files directory In addition to the GUI and command-line interfaces, Device Emulator 30 introduces the IDeviceEmulatorManager COM interface This interface can be used to discover currently installed images and control them If you re performing fuzzing or other repetition-based testing, the COM interface is helpful for controlling images

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Disaster recovery is a matter of ensuring that you can help the company recover from any kind of disaster When preparing for disaster you need to make sure that your disaster recovery plan includes backup and restore plans, contact information for product vendors, and step-by-step instructions on how to recover each part of your information systems The disaster recovery plan should contain detailed steps for recovering from any kind of data loss or physical disaster The step-by-step plan should contain the location of backup tapes, specify which tapes to restore in different scenarios, and list the steps for rebuilding servers, including detailed information on what to do when a disk fails and how to replace and rebuild the data

Lab Exercise 2601: Local Policies 506 Lab Exercise 2602: Event Viewer 509 Lab Exercise 2603: Cleaning and Protecting a Client s Computer 511 Lab Analysis Test 513 Key Term Quiz 514

The Windows Mobile SDK includes a cellular emulator capable of emulating the voice, data, and SMS portions of the cellular network (see Figure 4-4) The cellular emulator communicates with the emulated device using the device s serial ports It is also possible to send fake SMS messages to the device to see how the device behaves

A number of disaster recovery documents overlook key elements such as location of software and CD keys needed to rebuild the system Be sure that contact information for hardware and software vendors is included in the plan so that if you need to replace an item such as a disk you can contact the vendor Along with detailed recovery steps, a disaster recovery plan should contain detailed information on backup and restore strategies, offsite storage, hot and cold spares, and hot and cold sites

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10 discussed various backup and restore strategies and emphasized the need to guarantee that a strong backup plan is in place to aid disaster recovery If you have not created a strong backup plan that speci es what to back up and how frequently, you may not be able to recover from disaster Be sure to review your backup strategy and make certain that you have all the necessary data stored on backup media You should periodically verify that you can actually restore data using a test environment Further, make sure that you know and have documented the restore strategy to implement when disaster strikes

Figure 4-3

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