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This section explains Bandwidth considerations with WSUS and the new options introduced where in you can effectively plan/use the bandwidth in a chain of WSUS Servers.

Bandwidth Management thru:

1. Deferring the download of updates:

• WSUS offers you the ability to download update metadata at a different time from the update itself during synchronizations.
• In this configuration, approving an update only triggers the download of all the files used to install that particular update on a computer. That means you can only have meta data for all the updates.
• This certainly, saves bandwidth and WSUS server disk space, because only updates that you approve are downloaded to the WSUS server.
• Deferred downloads are enabled by default.

Real World Advantage:

Deferring the download of updates works in a scenario where you have a special Approval setting that only detects if a client requires an update, which is inturn recorded in the server-report. Now, if the Administrator sees that clients require update which were approved for detection, then he can approve those updates for installation.

2. Filtering updates:

• WSUS offers you the ability to choose only the updates your organization requires during synchronizations.
• You can limit synchronizations by language, product and type of update.
• By default WSUS downloads Critical and Security Updates for all Windows products in every language.
• Before synchronization, manipulate language options, product and update classification options.

3. Express installation files:

• The express installation files feature is a way of identifying the exact bytes that change between different versions of files, creating and distributing updates that include just these differences, and then merging the original file with the update on the client computer.
• Sometimes this is called delta delivery because it downloads only the difference, or delta, between two versions of a file.
• When you distribute updates by using this method, it requires an initial investment in bandwidth because, Express installation files are larger than the updates they are meant to distribute. This is because the express installation file must contain all the possible variations of each file it is meant to update.