Optimizing TCP performance in the network is, however, only one part of the equation. There are no set rules for application performance and typically application performance requirements will be highly dependent on the types of application being delivered and the needs of the organization. For example, a company with a very mobile employee base may have remote access needs requiring that the application delivery infrastructure not only effectively deliver an application to users on a LAN connection, but over many different types of WAN connections. The key is to provide the same user experience as though the remote employee was connected to the LAN.
When determining application performance needs and setting criteria for an application or group of applications, the network and/or application designer must understand the network, application goals, user base and the requirements of the organization. Additionally, it's important to have good monitoring tools that can help distinguish between application performance and WAN performance. This is a difficult thing to achieve and often requires having some knowledge of the details of a particular application, so a turnkey solution probably doesn't exist.
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