F5 White Paper Aercceal otin 102: Asymmectri or … Optimization X X Increases TCP performance:...

Acceleration 102: Asymmetric or Symmetric?Both asymmetric and symmetric acceleration technologies can deliver great benefit to your users. But how and where do you deploy them?

by Peter Murray Technical Marketing Manger

F5 White Paper

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White Paper Acceleration 102: Asymmetric or Symmetric?

ContentsIntroduction 3

Acceleration Topology Types 5

Asymmetric Acceleration 6

Asymmetric Acceleration Misconceptions 6

Asymmetric Acceleration Functions 7

Asymmetric Acceleration Benefits 8

Symmetric Acceleration 10

Deploying Symmetric Acceleration 11

Data Center to Data Center Deployment 11

Large Branch and Regional Office Deployment 11

Symmetric Web Acceleration 12

Symmetric Acceleration Using Client-based Acceleration Software 12

The Wonder Widgets Symmetric Solution 13

The Combined Wonder Widgets Solution 15

Tying it All Together 17

Conclusion 18

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IntroductionThis paper is the second in a series. The first, Acceleration 101, describes

acceleration features and terms. This paper focuses on topology options

for deploying acceleration features in an Application Delivery Network (ADN).

Acceleration is an excellent technology for overcoming the limitations inherent

in today’s networks and applications. An application acceleration solution can

significantly reduce application response times—improving the chances for

success for application rollouts; increasing user productivity; and increasing

revenues from e-commerce sites by minimizing abandoned transactions or

shopping carts due to slow page loads, failed transactions, or error messages.

You can deploy acceleration asymmetrically, symmetrically, or in combination.

Where you deploy asymmetric and symmetric acceleration features depends

largely on the geographic distribution of your organization’s members

and customers. Table 1 summarized the acceleration features described in

the Acceleration 101 white paper (http://www.f5.com/pdf/white-papers/

acceleration-101-wp.pdf), and illustrates how each can be deployed in a network.

FeatureAsymmetric Deployment

Symmetric Deployment

Benefit

Server Load

BalancingX

Ensures users access the best performing

information source at that moment.

Global Server

Load BalancingX

Ensures that users access the highest-performing

site at that moment.

Compression X X

Decreases transmitted data:

Asymmetric compression condenses web data

for transmission to a browser.

Symmetric compression condenses any data for

transmission to a remote acceleration device.

Data

DeduplicationX

Replaces previously-sent data with dictionary

pointers, minimizing transmitted data and ensuring

rapid user response time. Also ensures data is

current and delivered only to authorized users.

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FeatureAsymmetric Deployment

Symmetric Deployment

Benefit

TCP

OptimizationX X

Increases TCP performance:

Asymmetric optimization aggregates requests for

any TCP protocol to reduce connection processing.

It optimizes TCP processing for TCP/IP stacks that

increases client-side connections to speed web page

downloads.

Symmetric optimization aggregates transactions

inside tunnels that connect acceleration devices.

Web Browser

Object CachingX

Manipulates HTTP responses to increase browser

caching and decrease HTTP requests.

Remote Web

Object CachingX

Reduces client response times by serving web

objects directly from a remote device rather than

from a central server.

Non-Web

Object CachingX

Reduces client response times by serving files

directly from a remote device rather than a

central server.

HTTP Protocol

and Web

Application

Optimization

XManipulates web requests and responses to

increase HTTP and web application efficiency.

Table 1: Acceleration feature deployment

Asymmetric acceleration uses a centrally located acceleration device to

perform optimizations that increase performance for all users connected to that

data center. Some asymmetric optimizations, such as TCP optimization and

load balancing, are useful for many applications and protocols. Others, like

web acceleration are application-dependent. Regardless, no special software is

required for client systems; asymmetric acceleration uses techniques that do

not affect endpoint devices.

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Symmetric acceleration requires either two acceleration devices with one at

each end of a network link, or a central acceleration device and client software

that operate together to perform acceleration functions for the client.

Organizations can deploy acceleration technology features asymmetrically,

symmetrically, or both, depending on several factors. While there is a debate

in the industry (mostly by vendors that offer one solution or the other) over

whether asymmetric or symmetric acceleration provides the best performance

improvement and which represents the best ROI, the truth is that both methods

benefit users. The best deployment topology for your Application Delivery

Network depends on many factors, including the location(s) in which your users

reside, your organization’s ability and willingness to deploy and maintain devices

in remote offices, the applications you want to accelerate and your budget.

This paper uses Wonder Widgets, Inc., the example company introduced in the

Acceleration 101 white paper to illustrate how a typical company can benefit

from asymmetric and symmetric acceleration.

Acceleration Topology TypesIn the Acceleration 101 white paper, the Wonder Widgets team researched

acceleration technology and found that many acceleration features are worth

implementing to solve their needs. In fact, they were already using some

acceleration features. Now, Kristina, the Wonder Widgets CIO, and her team

are investigating where and when to implement additional acceleration

technologies in their network.

Application acceleration deployment can be configured asymmetrically,

symmetrically, or in combination. Before examining each acceleration topology,

it is important to review the benefits that any organization should consider

when determining the need for an acceleration solution:

Improving WAN-based application performance accelerates application •

adoption and increases user productivity

Decreasing variable burst costs associated with Content Delivery Network •

(CDN) services can decrease monthly telecommunications charges

Deployment flexibility reduces ongoing maintenance costs and increases •

user satisfaction

Accelerating SSL-encrypted application traffic increases application •

performance and organizational security

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Improving existing server capacity eliminates or delays the need to expand •

data centers and reduces power and cooling costs

Decreasing bandwidth utilization improves efficiency of existing capacity •

and may eliminate the need for expanded capacity

Kristina’s team realizes that their company’s unique challenges greatly affect

whether they deploy an asymmetric acceleration topology, symmetric acceleration

topology, or a combination. During their weekly staff meeting, they decide to

begin investigating asymmetric acceleration.

Asymmetric AccelerationBruno, the network architect, knows that the industry referred to asymmetric

acceleration as just “acceleration” until symmetric acceleration devices

appeared on the market. For example, a server load balancer qualifies as an

early version of an asymmetric acceleration device because it improves application

performance for all users by spreading user load across multiple servers or

other devices like firewalls or access controllers, and requires only one device

in the data center. A newer example is a web acceleration device, which

compresses web traffic, caches static objects, and manipulates HTTP and web

application behavior.

Asymmetric acceleration requires only one device to accelerate applications

and reduce network traffic across public network links where latency,

packet loss, Quality of Service (QoS) issues, and application throughput cannot

always be controlled. Application response times, which can be completely

satisfactory when an application is run over a LAN, may become intolerable

when users access the application across a link that suffers from high latency

or low bandwidth. An asymmetric acceleration device can dramatically improve

performance and reduce response times, making the application run as if it

was being served locally.

Asymmetric Acceleration Misconceptions

An associate from another company tells Bruno that asymmetric acceleration is

really only for web-based (HTTP or HTTPS) traffic, and cannot modify browser

behavior. Bruno is surprised, as he has just read how asymmetric acceleration is

useful for much more than web traffic, so he decides to investigate further.

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He finds out that some asymmetric acceleration products can do far more than

accelerate web traffic. They can balance server load, optimize TCP, and apply and

enforce QoS for any application running over TCP. Furthermore, some asymmetric

solutions can also offload server-side SSL processing for any application running

over TCP. These features can dramatically improve application performance.

Although Bruno’s associate mentions that centralized acceleration solutions can’t

influence inbound WAN traffic because these solutions do nothing to modify a

browser’s behavior, Bruno has already learned that some acceleration devices

can modify server response content to enable more simultaneous connections

to a single URL. The acceleration device modifies an HTTP response by slightly

changing the URLs in the response so a browser can open more simultaneous

connections, as described in the Acceleration 101 white paper.

In addition, some acceleration devices can rewrite HTTP headers to modify

browser behavior. Some can modify cache headers to tell browsers to cache an

object, even though the application identifies the content as non-cacheable. A

company logo, a line on the web page, or a background color, for example, may

be static but marked as non-cacheable. The acceleration device modifies the

object header to mark the content as cacheable.

These features can significantly reduce or eliminate unnecessary traffic, whether

due to inefficiencies in the HTTP protocol or in application implementations. They

provide the first level of relief for an organization’s overburdened WAN links and

can often reduce utilization enough to ensure significantly better application

response for all remote locations.

Asymmetric Acceleration Functions

Asymmetric acceleration combines protocol-level optimizations and application-

layer acceleration techniques to improve response times. It helps overcome

problems caused by distance and protocol or application implementation

inefficiencies by making protocols more efficient. For example, an asymmetric

acceleration device can:

Reduce server-side TCP connections by aggregating multiple client-side •

connections into fewer server-side connections

Increasing the number of client-side connections to speed web •

page building

Compress content, allowing a proxy to offload compression while enabling •

the device to perform other actions on the uncompressed content

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Cache content, offloading servers and increasing performance•

Mark HTTP objects as static, enabling clients to load objects directly from •

browser cache

Transparently correct HTTP bugs or feature deficiencies•

Offload SSL, dramatically increasing server performance and offering a •

simpler repository for certificates

Asymmetric Acceleration Benefits

Bruno’s research tells him that biggest single advantage to an asymmetric

acceleration solution is that it can dramatically reduce the Total Cost of Ownership

(TCO). An asymmetric acceleration solution requires no point-product in branch

or regional offices and requires no additional client software to make the solution

work properly. Instead, a single, central device can handle acceleration for all

users, making it the ideal first step for improving user experience and reducing

traffic for customers, partners, and remote users of corporate applications alike.

It also reduces TCO by reducing the ongoing management required for remote

devices and software clients.

Asymmetric acceleration also helps control costs by increasing server capacity.

The acceleration device can offload server operations that are CPU and

memory-intensive, freeing the server to perform its primary function—

serving files. Offloading SSL termination, optimizing TCP/IP connections, and

implementing intelligent caching helps increase application server capacity. Often,

this enables an organization to delay or even eliminate the need to purchase

additional server hardware or deploy additional application software licenses.

Asymmetric acceleration also offers benefits to CDN customers. CDN customers

can face surprisingly high overage charges when traffic exceeds the contracted

monthly service amount. Without an acceleration device, the customer must

either suffer potentially huge monthly overage costs or regularly upgrade the

agreed monthly service amount (and of course, the cost) to maintain the lowest

overall service cost. Deploying an asymmetric solution where the acceleration

device correctly marks content as cacheable reduces user requests for content

and, therefore, CDN overage charges.

Yet another way an asymmetric acceleration device can help control costs is by

specifically optimizing web-based applications. Many organizations are moving

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towards web-based application delivery because it simplifies deployment and

lowers costs. Even if your organization uses many legacy applications today, it

makes sense for you to ensure you know your organization’s plans for deploying

newer, web-based applications or web-based versions of legacy applications.

Chances are, your organization is already evaluating or deploying one or more

of the new web-enabled versions of traditional applications that are rapidly

replacing legacy software.

For example, Microsoft® Office® SharePoint® using the Common Internet

File System (CIFS) displaces Windows File Sharing in the enterprise. Some

asymmetric solutions can specifically accelerate SharePoint using one central

device. Moreover, it’s not just Microsoft. BEA, Oracle, and SAP are all examples

of legacy application vendors that are moving to web-based clients for which

asymmetric acceleration templates are available. Deploying applications with

pre-defined templates dramatically speeds deployment and provides dramatic

performance gains at a very reasonable cost. This is especially beneficial for users

in small remote or branch offices where implementing a symmetric acceleration

device is costly and provides less benefit than in a larger office.

Kristine and her team realize that placing asymmetric acceleration devices in

the Paris office is the best first step for the performance problems Wonder

Widgets faces. Asymmetric acceleration devices will immediately improve their

customer-facing community application, speed content downloads, reduce

CDN charges, and improve application performance both for the web-based

community and for web-based employee applications.

Kristina directs Bruno to replace their existing Paris-based load balancers with

Application Delivery Controllers (ADCs) that also offer web acceleration

features. Adding ADCs with web acceleration modules will increase performance

and reduce response times for web applications and all other TCP applications

accessed by worldwide remote users.

Figure 1 (following page) shows how Wonder Widgets, Inc. plans to deploy

asymmetric acceleration along with upgraded ADCs as a first step in building

an advanced ADN.

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Paris

Customers

Customers

Customers

Sales

Sales

CustomersVPN

Internet or VPN

Sales

Bangalore

San Diego

Beijing

VPN

VPN

Database Servers Blade Servers

WANJet

BIG IPLocal Traffic Manager

Firewalls

Enterprise Manager

BIG IPGlobal Traffic Manager

Servers

BIG-IPLocal Traffic

Manager

Load Balancing and Asymmetic Acceleration

Symmetric AccelerationNext, Bruno and Anne, the application architect, investigate symmetric

acceleration, which is a more recent technology than asymmetric acceleration.

It requires either an acceleration device at both ends of a WAN link or

the combination of a central acceleration device and acceleration software

on client systems. It is most often associated with WAN Optimization

Controllers (WOCs).

Like asymmetric acceleration, symmetric acceleration combines protocol-level

optimizations and application-layer acceleration techniques to improve

response times. It also uses either data deduplication or caching to position

the data closer to users at the far end of a remote link. For example, when

used in a arge regional branch office, this results in faster response times for

clients and reduced bandwidth utilization over WAN links.

Figure 1: Asymmetric acceleration configuration example

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Both Bruno and Anne are concerned about the cost of deploying symmetric

acceleration in every office. Although users in small offices can benefit from

symmetric acceleration, the benefit can come at a price beyond the means of

many organizations.

However, monthly data transport costs associated with WAN-based

communication, especially high-speed links that span large distances, often

exceed total application and network hardware costs by significant margins.

Accelerating all WAN traffic between larger branch offices and the data

center—or between selected regional offices and the data center—generally

offers the next best return on investment after an asymmetric deployment.

Bruno and Anne decide to investigate where to deploy symmetric acceleration.

Deploying Symmetric Acceleration

Now that they better understand symmetric acceleration, the Wonder Widgets

team looks more deeply into symmetric acceleration. Symmetric acceleration

deployments generally fall into the following categories:

Data center to data center data replication•

Backup and branch office acceleration for all protocols, or •

Branch office acceleration for static web content•

Each scenario, when deployed effectively, has its benefits.

Data Center to Data Center Deployment

One of the largest bandwidth consumers and performance bottlenecks for many

organizations is real-time data replication and backup. Some symmetric solutions

boost replication performance between data centers by a factor of 7x (700

percent). The bandwidth reduction and the productivity benefits achieved from

accelerating business-critical functions can prevent the organization from paying

ever-increasing WAN bandwidth charges and deliver ROI in a matter of months.

Large Branch and Regional Office Deployment

TCP optimization, compression, data deduplication, and remote data caching

can improve performance for corporate email, legacy applications and other

file-sharing applications. These features can accelerate any TCP protocol traffic

between large offices and corporate data centers. In larger branch and remote

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offices, accelerating all application traffic enables higher productivity and lowers

transaction costs for all users. Using a symmetric solution also enables local users

to back-up data to a central repository, simplifying backup strategies and lowering

branch-office hardware costs.

Accelerating all protocols for users within a geographic region can be another

good use of symmetric acceleration. Users within a region can connect through

the regional office using a VPN and share both the symmetric acceleration device

with the regional office and the higher-speed link with the central data center.

This approach enables an organization realize the benefit of the acceleration

device across all regions, even if the office is relatively small. Remote users get the

advantage of having content cached locally plus the benefit of having transactions

terminated regionally, greatly reducing application problems caused by latency.

Symmetric Web Acceleration

Users in larger branch or regional offices and users that connect directly to

regional offices can achieve high performance increases from symmetric web

acceleration devices. Static web content is cached as users access it from a remote

office so over time, most static content resides in the remote office. Users in the

remote office access the static content from the local cache, but those connecting

to the remote access via VPN gain even more. Instead of dealing with the high

latency and low bandwidth of a direct connection to a data center, users connect

to the regional office through a VPN and access the content cached in that

office. VPN connections by these users to data centers also benefit from the TCP

optimization, caching, and data deduplication the remote acceleration device offers.

Symmetric Acceleration Using Client-based Acceleration Software

A recent form of symmetric acceleration uses a Software-based WAN

Optimization Controller (SoftWOC), which is client-based software hat performs

compression, perform or assists with caching, optimize TCP, and in some cases,

provides universal remote access via SSL. Some SoftWOCs can even perform

these actions for all TCP protocols, not just HTTP/HTTPS. The SoftWOC client

communicates with a central device, performing similar functions to those

supplied by a remote symmetric acceleration device.

The advantage to a SoftWOC client is that individual remote users can achieve

performance gains individually. SoftWOCs that integrate application acceleration

and secure access simplify user access, deployment, and client management.

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However, there are disadvantages to this approach. First, a SoftWOC must be

loaded and maintained on every system that will use the technology. External

partners, suppliers and commercial web users do not benefit because they do

not have the SoftWOC installed on their systems. Second, SoftWOCs can require

multiple Gigabytes of local disk storage to cache downloaded content. This means

organizations might have to upgrade systems That use a SoftWOC to support

the required disk space and memory requirements or limit the SoftWOC to users

whose systems meet the requirements. Third, many organizations are loath to

load and maintain multiple software clients on the same system, so acceleration

and universal access are more of a requirement than a luxury. Finally, a software

SoftWOC may cause a security hole due to cached content present on disk.

If the majority of your users are in larger offices, or your largest pain point

revolves around backup and corporate data replication to a disaster recovery

site, chances are that a symmetric solution using two acceleration devices will

benefit you most.

The Wonder Widgets Symmetric Solution

Kristina and her team have decided that symmetric WAN acceleration can be

useful for the link between the Paris and San Diego data centers. They will use

symmetric acceleration to replicate data between data centers and to accelerate

legacy financial applications that reside in Paris and San Diego.

Anne suggests they add symmetric web acceleration between Paris and the

San Diego office, which serves as the U.S. regional office and houses the

secondary data center. Bruno further suggests that they deploy global server

load balancing in the Paris office to ensure users are directed to the closest,

best performing site. They know that plans are in place to begin serving social

networking and entertainment content from both Paris and the San Diego data

center, and want to ensure consistent high performance.

By using symmetric web acceleration in Paris and San Diego and global server

load balancing in Paris, corporate users in the Paris office will benefit from rapid

symmetric access to applications in San Diego and vice versa.

Anne further suggests they add a stand-alone web acceleration device in the

Beijing office. As with deploying the web acceleration devices in Paris and San

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Diego, the Beijing manufacturing team will benefit from rapid symmetric access to

the Paris-based web manufacturing application and Asian commercial users will

benefit from regional asymmetric web acceleration in Beijing.

Kristina agrees and directs Bruno to replace the load balancer in San Diego with

an Application Delivery Controller that also offers web acceleration features, and

to add a stand-alone web acceleration device in Beijing.

Figure 2 shows how Wonder Widgets, Inc. plans to deploy symmetric acceleration.

Paris

Customers

Customers

Customers

Sales

Sales

CustomersVPN

Internet or VPN

Sales

Bangalore

San Diego

Beijing

VPN

VPN


WANJet

Firewalls

Enterprise Manager

Servers

WANJet

BIG-IPLocal Traffic

Manager

SymmetricWAN Acceleration

Server Load Balancing and Symmetric Web Acceleration

Standalone SymmetricWeb Acceleration

Figure 2: Symmetric acceleration configuration example

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The Combined Wonder Widgets Solution

After reviewing the symmetric acceleration recommendations, Bruno realizes

that deploying symmetric web acceleration devices in Paris, San Diego, and Beijing

enable Wonder Widgets to add another device to both ensure high availability

and simultaneously enable a combination of asymmetric and symmetric web

acceleration for Wonder Widgets’ remote users and retail customers.

Although web applications are only served from the Paris site currently, web

application data is already being replicated to San Diego. This enables San Diego

to take over serving the web applications in case of an outage in Paris. Similarly,

legacy application data is being replicated to Paris, which could take over if the

San Diego site becomes unavailable. Adding geographic server load balancing

would enable simpler and faster failover for customers in the event the Paris or

San Diego sites went offline.

Second, Wonder Widgets can greatly improve performance for remote users by

directing web requests to the closest geographic site. Shorter TCP handshaking

due to less latency will speed transactions.

If the closest geographic site hosts the web application requested by a user,

the web application will be served from there and the user will benefit from

asymmetric web acceleration. If the web application is served from another

site, the user will benefit from asymmetric web acceleration to the closest

geographic site as well as from symmetric web acceleration to the site that

hosts the web application.

Bruno sees that combining asymmetric and symmetric web acceleration would

benefit both remote Wonder Widgets workers, especially salespeople and

retail users. He suggests to Kristina that they deploy global server load balancing

in the Paris office. She agrees and directs Bruno to add geographic server load

balancing to the Paris data center. Figure 3 (following page) shows how the

combined Wonder Widgets solution offers a combination of asymmetric web

acceleration, symmetric web acceleration, and symmetric WAN acceleration.

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Paris

AmericasCustomers

AsiaCustomers

AsiaSales

AmericasSales

EMEACustomers

VPN

Internet or VPN

EMEASales

Bangalore

San Diego Beijing

VPN

VPN


WANJet

Firewalls

BIG IPGlobal Traffic

Manager

Servers

WANJet

BIG-IPLocal Traffic

Manager

AsymmetricWeb Acceleration

SymmetricWeb Acceleration

Global ServerBalancing Load

SymmetricWAN Acceleration

Figure 3: Combined asymmetric and symmetric acceleration configuration example

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Tying it All TogetherKristina looks forward to presenting her team’s solution to the next Wonder

Widgets, Inc. board meeting. She and her team are confident that they have

identified their pain points and potential acceleration solutions. Plans are in

place to deploy the acceleration features that will improve performance for

external customers, internal users, partners, and suppliers. Reduced WAN traffic

and server offload will give them the added capacity they require for future

innovation and will lower both capital and operating expenses by simplifying

heir application infrastructure.

External customers will benefit from asymmetric acceleration, receiving faster

web response from Wonder Widgets’ social networking and content site

applications. Wonder Widgets’ corporate users in Paris, San Diego, and Beijing

will benefit from symmetric web optimization, receiving better performance for

their shared web applications. Corporate users will also benefit from symmetric

WAN acceleration for faster access to legacy applications and remote file access.

Wonder Widgets, Inc. remote sales staff and remote workers will also benefit

from both asymmetric and symmetric acceleration. Remote staff will log into

Paris, San Diego, or Beijing as appropriate to benefit from asymmetric

acceleration from wherever they may be. Remote staff will also benefit from

symmetric web acceleration between the regional offices and either Paris or

San Diego as appropriate.

The Wonder Widgets, Inc. example acceleration deployment helps illustrate

where it makes sense to deploy asymmetric and symmetric acceleration.

Asymmetric acceleration technologies, including server load balancing, global

server load balancing, TCP optimization, SSL optimization, web acceleration,

and asymmetric caching and compression offer benefits to any user whether they

are internal or external to the organization.

Symmetric acceleration technologies, including TCP optimization, symmetric

compression caching, data deduplication, and SSL offload offer benefits

to corporate users in Wonder Widgets, Inc. major branches as well as remote

and external users.

Acceleration 102: Asymmetric or Symmetric? 08/08 © 2008 F5 Networks, Inc. All rights reserved. F5, F5 Networks, the F5 logo, BIG-IP, VIPRION, FirePass, and iControl are trademarks or registered trademarks of F5 Networks, Inc. in the U.S. and in certain other countries. 18


F5 Networks, Inc.Corporate Headquarters401 Elliott Avenue WestSeattle, WA 98119+1-206-272-5555 Phone(888) 88BIGIP Toll-free+1-206-272-5556 [email protected]

F5 NetworksAsia-Pacific+65-6533-6103 Phone+65-6533-6106 [email protected]

F5 Networks Ltd.Europe/Middle-East/Africa+44 (0) 1932 582 000 Phone+44 (0) 1932 582 001 [email protected]

F5 NetworksJapan K.K.+81-3-5114-3200 Phone+81-3-5114-3201 [email protected]

ConclusionApplication acceleration is a viable technology with demonstrable benefits.

Virtually any organization, its internal users, customers, partners, and

suppliers can benefit from the features acceleration and optimization supply.

Acceleration is not a “one size fits all” solution. Features required for one

application or location may be inappropriate for another. Some acceleration

features are implemented widely while others are limited to one or a small

subset of vendors.

The most important decisions should be choosing a partner you can trust and

choosing the solution gives you the best application acceleration return for the

investment you make.

Installing an asymmetric acceleration solution as a starting point provides most

organizations the biggest bang for the buck, especially for web applications.

If your organization shares applications with many small offices, remote users,

suppliers, partners, or the public, asymmetric acceleration offers the simplest

way to ensure the greatest performance gain for the lowest cost. Even more

importantly, implementing asymmetric acceleration for web-based applications,

regardless of other solutions, is likely to offer the largest single performance

gain you can achieve.

Symmetric acceleration offers the next step for companies with large, distributed

sites, large data replication/backup requirements, and higher-speed WAN links.

When you evaluate a solution, take the time to determine whether a single

solution can support both asymmetric and symmetric deployment configurations.

Solutions supporting both offer greater flexibility and adapt more rapidly to

the volatile environment of both corporate network architectures and public

networks, and will ultimately result in the greatest ROI.

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