Deploying Cisco Wide Area Application Services (Networking Technology)

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To participate in the hands-on labs in this class, you need to bring a laptop computer with the following: We recommend using at least a Pentium 4 or better and 1 GB of RAM or more.

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Safari and Mozilla Firefox for Mac OSX All students are required to have administrator rights to their PCs and cannot be logged in to a domain using any Group Policies that will limit their machine's capabilities. If you do not have administrator rights to your PC, you at least need permissions to download, install, and run Cisco Any Connect Client.

If you are participating in a WebEx event, it is highly recommended to take this class at a location that has bandwidth speeds at a minimum of 1 Mbps bandwidth speeds. SlideShare Explore Search You. Submit Search.

What is Wide Area Application Services (WAAS)? - Definition from

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Embed Size px. Start on. Show related SlideShares at end. These are examined in the following three sections. L4—7 latency is a culmination of the latency components added by each of the four layers involved: application, presentation, session, and transport. Given that presentation layer, session layer, and transport layer latency are typically low and have minimal impact on overall performance, this section focuses on latency that is incurred at the application layer. It should be noted that, although significant, the latency added by L4—7 processing in the node itself is typically minimal compared to latency found in the network itself, and far less than the performance impact of application layer latency caused by protocol chatter over a high-latency network.

Cisco Wide-Area Application Services

Application layer latency is defined as the operational latency of an application protocol and is generally exhibited when applications or protocols have a "send-and-wait" type of behavior. An example of application layer latency can be observed when accessing a file on a file server using the Common Internet File System CIFS protocol, which is predominant in environments using Windows clients and Windows servers, or network-attached storage NAS devices that are being accessed by Windows clients. In such a case, the client and server must exchange a series of "administrative" messages prior to any data being sent to a user.

For instance, the client must first establish the session to the server, and establishment of this session involves validation of user authenticity against an authority such as a domain controller. Then, the client must establish a connection to the specific share or named pipe , which requires that client authorization be examined.

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Once the user is authenticated and authorized, a series of messages is exchanged to traverse the directory structure and gather metadata. Each of these messages requires that a small amount of data be exchanged over the network, causing operational latency that may be unnoticed in a local-area network LAN environment but is significant when operating over a WAN.

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Figure shows an example of how application layer latency alone in a WAN environment can significantly impede the response time and overall performance perceived by a user. In this example, the one-way latency is ms, leading to a situation where only 3 KB of data is exchanged in ms of time.

It should be noted that although the presentation, session, and transport layers do indeed add latency, it is commonly negligible in comparison to application layer latency. It should also be noted that the transport layer performance itself is commonly subject to the amount of perceived latency in the network due to the slowness associated with relieving transmission windows and other factors.

The impact of network latency on application performance is examined in the next section, "Network Infrastructure. The lack of available network bandwidth discussed in the section, "Network Infrastructure" coupled with application layer inefficiencies in the realm of data transfer creates an application performance barrier.

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This performance barrier is manifest when an application is inefficient in the way information is exchanged between two communicating nodes. For instance, assume that ten users are in a remote office that is connected to the corporate campus network by way of a T1 1. Such scenarios can massively congest enterprise WANs, and similarities can be found across many different applications:.