Windows 7 / Networking

Transparent caching

You need to know how to enable transparent caching and the difference between it and Offline Files and BranchCache.

Transparent caching optimizes bandwidth consumption on WAN links for mobile users and users at branch office sites that are accessing network files and folders that have not been explicitly made available offline. This makes it different from BranchCache and Offline Files. After a user has opened a file off a remote server where the network latency exceeds the configured value, the file is stored in the Offline Files cache on the local hard disk drive. Subsequent file access is from the cached file, although checks are performed to verify that the cached file is up to date. Modifications to the file are written back to the server, not to the cache.

Files subject to transparent caching are not available to the user when the user is offline. You enable transparent caching by configuring the Enable Transparent Caching policy that is available in the Computer Configuration\Administrative Templates\Network\Offline Files node of a Group Policy. The default value is to cache files if there is a 32,000-millisecond network latency, though this can be adjusted. Transparent caching is not enabled by default. Transparent caching is also automatically enabled when you enable BranchCache.

Tip:
Remember the difference between transparent caching and BranchCache.

Creating and migrating power policies

You need to know how to create a new power scheme, as well as how to import and export an existing power scheme.

Power policies are also known as power schemes. You create new power policies by duplicating existing policies and then modifying them. To do this from the GUI, open the Power Options Control Panel item, click Create A Power Plan, and then select the plan you want to use as the basis for the new plan. Enter a name for the plan and click Create.

You can create a new power scheme using powercfg.exe by using the -duplicatescheme parameter. You must supply the GUID of the scheme that you want to duplicate. To get a power scheme's GUID, use the powercfg.exe -list command from an elevated command prompt. This command will output all current power schemes and their GUIDs.

You export and import power schemes from the command line using the powercfg.exe utility. You cannot export or import a power scheme using the Power Options Control Panel item. To export a power scheme, you must know the scheme's GUID. To export a power scheme, use this command: powercfg -export name.pow <GUID>, where name.pow is the name of the power scheme that you want to export. To import a power scheme, issue the command powercfg -import name.pow. You can either supply a GUID, or allow Windows 7 to generate and use a new GUID.

Tip:
Remember that you use powercfg.exe to import and export power schemes.
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