zxing generate qr code example c# How Hosted Cache Works in C#.NET

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How Hosted Cache Works
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At a detailed level, the Hosted Cache model follows this process to cache and retrieve data:
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The client running Windows 7 connects to the content server (a file or Web server running Windows Server 2008 R2) and requests a file (or part of a file), exactly as it does if it retrieves the file without using BranchCache . After authorizing the user, the server returns an identifier that includes a signed hash of the data segment . The client uses the identifier to search for the file on the Hosted Cache, a local server running Windows Server 2008 R2 . Because this is the first time any client has retrieved the file, it is not already cached . Therefore, the client retrieves the file directly from the content server . The client stores a copy of the data in the Hosted Cache . A second client running Windows 7 requests the same file from the content server . Again, the content server authorizes the user and returns an identifier .
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The client uses the identifier to request the data from its Hosted Cache server . The Hosted Cache encrypts the data and returns it to the client . The client then validates the data using the hash provided as part of the identifier to verify that it has not been modified .
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Figure 25-6 illustrates this process .
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3 Transfer identifier 1 Transfer document Branch office
2 Cache document
Requesting client 4 Retrieve cached document Hosted cache
FIgURE 25-6 The Hosted Cache architecture
How Distributed Cache Works
The process is similar to that used by Hosted Cache mode, except requests for cached content are multicast to the local network and a Hosted Cache server is not required:
A client running Windows 7 connects to the content server and requests data . The server authorizes the user and returns an identifier . Because this is the first time any client has attempted to retrieve the file, it is not already cached on the local network . Therefore, the client retrieves the file directly from the content server and uses BranchCache to cache it on its hard disk . A second requesting client running Windows 7 requests the same file from the content server . Again, the content server authorizes the user and returns an identifier . The requesting client sends a request to its peers on the local network for the required file using the WS-Discovery multicast protocol .
2. 3.
CHapTER 25 Configuring Windows Networking
The client that previously cached the file becomes the serving client and sends the file to the requesting client . The data is encrypted using an encryption key derived from the hashes . The client decrypts the data, validates it, and passes it to the application .
Figure 25-7 illustrates this process .
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Content server
2 Transfer identifier 1 Transfer document Branch office 3 Requested cached document
Serving client
Requesting client
4 Retrieve cached document
FIgURE 25-7 The Distributed Cache architecture
Configuring BranchCache
BranchCache clients can be managed using either Group Policy or the Netsh commandline tool . You can configure BranchCache using Group Policy settings located in Computer Configuration\Policies\Administrative Templates\Network\BranchCache . You can define the following settings:
Turn On BranchCache
Enable this setting to turn on BranchCache .
Set BranchCache Hosted Cache Mode Enable this setting to turn on Hosted Cache mode and then specify the location of the Hosted Cache server . Because different branch offices should have different Hosted Caches, you will need to define different GPOs for different branch offices . Set BranchCache Distributed Cache Mode Enable this setting to turn on Distributed Cache mode when you cannot use Hosted Cache because a computer running Windows Server 2008 R2 is not available in the branch office .
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CHapTER 25
Configure BranchCache For Network Files Enable this setting to change the default latency required before BranchCache stores a copy of data retrieved from a file server . By default, BranchCache will cache data only if latency is greater than 80 milliseconds (ms) . Typically, data travels across a LAN in less than 20 ms . Set Percentage Of Disk Space Used For Client Computer Cache Enable this setting to define the amount of space that Distributed Cache clients dedicate to the BranchCache data store . By default, BranchCache will use 5 percent of the total disk space . Additionally, you can prevent the Background Intelligent Transfer Service (BITS) from using BranchCache by enabling the Do Not Allow The BITS Client To Use Windows Branch Cache policy in the Computer Configuration\Policies\Administrative Templates \Network\Background Intelligent Transfer Service node of a GPO . You can use the Netsh command-line tool to view or change BranchCache settings . The following are the most useful Netsh commands:
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