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14 | Dell SonicWALL WXA 1.3 User’s Guide
The illustration below displays the basic network topology for the Dell SonicWALL WXA series
appliance and the NSA/TZ series appliances.
Transmission Control Protocol Acceleration
The TCP Acceleration service is a process that decreases the amount of data passing over the
WAN by using compression, which accelerates selected traffic passing between a central site
and a branch site. The selected traffic is stored in the Dell SonicWALL WXA series appliances’
shared databases as blocks of data and tagged with reference indexes. This allows the WXA
series appliances to only send the reference indexes (which are smaller in size) over the WAN
instead of the actual data.
Refer to Configuring TCP Acceleration on page 47, for details on how to configure TCP
Acceleration.
Windows File Sharing Acceleration
WAN Acceleration refers to a wide range of technologies that are aimed at accelerating
applications, improving throughput, and reducing latency. Windows File Sharing (WFS)
Acceleration is a subset of WAN Acceleration.
The use of WFS Acceleration within your network reduces the impact of high-latency and low-
bandwidth links by approximating streaming behavior through the use of read-ahead and write-
behind functionality and differential file transfer to avoid re-transferring parts of files that have
not changed. WFS Acceleration allows branch users to access and share commonly used files
at near-LAN speeds over the WAN. Distributed enterprises that deploy WFS Acceleration
solutions are often able to consolidate storage to corporate central sites, eliminating the need
to back up and manage data that previously resided in their branch sites.
Internet
PC
PC
PC
Branch Site
Central Site
WXA series
appliance
NSA/TZ series
appliance
NSA/TZ series
appliance
WXA series
appliance
Domain
Controller
Switch
Switch
File
Server
Email
Server
Web
Server