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whereas protection carriers will sell you wares for any rational layer and every feasible places on your corporate network, IP safety-based VPN gateways stand emerged as the most routine classification of product for establishing relaxed, website-to-web page connections.
In their contrast of 13 products in this market, they appeared at the universal manageability, efficiency and enterprise-concentrated feature criteria, but they moreover added a new collection of interoperability exams to the combine.
In all, it changed into an astonishingly shut race. nobody product stood out as the winner across every classes. This provide-and-take is mirrored in their scorecard, where more than half the items are within some extent of every different within the remaining tally. as a result of the extraordinarily immediate scoring, they are not awarding a Blue Ribbon Award for this check.
because of ambiguities within the IPSec accustomed specification, not each supplier’s product will toil with every different dealer’s paraphernalia – notwithstanding each may stand a “suitable” protocol implementation. That makes interoperability some of the highest property challenges for VPN providers.
We set up a hypothetical security coverage for a big, multisite community and evaluated how well each and every VPN product could healthy into that community. With distinctive facts centres and department offices with switches, routers and firewalls, their examine at various mattress became designed to resemble a typical enterprise facts services network. They validated interoperability of each product in opposition t every other VPN product, each in constructing initial secure connections and in conserving long-term operation over a live counted of days. mainly, they rated how each product worked with the others, worked with their certificates authority and with Popular VPN customer application, and how smartly each and every handled different VPN authentication methods.
a crucial Part of their comparison turned into making items toil in a replete mesh. while well-nigh every VPN supplier can carry out bake-off style interoperability (where they correctly negotiate a safety affiliation with one other dealer), they wanted to peer what network professionals can live confronted with making an attempt to pin together a actual multivendor network securely.
Our appropriate interoperability class score went to secure Computing’s Sidewinder. appropriate at the back of Sidewinder were items from Avaya Inc., determine point application technologies Inc., Cisco methods Inc., Microsoft Corp., Nortel Networks Corp. and Nokia Corp.
although the purpose rankings in response to their predefined evaluation criteria residence Cisco very nearly on the appropriate, they discovered severe restrictions in its implementation. Cisco has been both saddled and blessed with its command-line configuration interface. while some network managers adore it, VPN designers will ascertain it less than comforting. To hold VPN configuration manageable in the command line atmosphere, Cisco permits for less than a single cyber web Key alternate (IKE) policy per device. while that worked powerful for their verify (we wanted a single corporate policy), it wouldn’t toil neatly in an environment where IKE coverage distinctive throughout sites. definitely, once they introduced the SafeNet customer into their interoperability examine, they stand been pressured to damage their Cisco pics configuration: it might toil with the coverage they chosen, or with the SafeNet customer, however no longer each at the identical time.
We used digital certificates issued by using an Entrust public-key infrastructure (PKI) server for web site-to-web page authentication and institute out a major variability in how the VPNs below examine interacted with this PKI. Unauthorized entry to company networks is a mountainous difficulty, and one that VPNs can wait on to remedy.
Sidewinder, Nortel’s Contivity 1600 and assess point’s VPN-1 every provided first rate facts that they were in manipulate of who become coming into their community and what elements they had access to. every three items let us specify in as limited or as a powerful deal aspect precisely what kinds of certificates were needed to secure into their network. In contrast, Lucent’s access aspect one thousand and Cisco’s photos 525 and IOS (Cisco entered both IOS on an optimized 7140 VPN Router platform with hardware acceleration and pics 525 as web site-to-web page items with discrete capabilities and design dreams) had a more comfortable view of access handle: once you bought a certificates from the PKI, you were free to develop any ilk of VPN connection you wanted. This generally is a killer in an extranet atmosphere, the residence now not each person is sharing the equal PKI and the residence you acquired your digital certificates is frequently just as necessary as what the certificates says.
Hewlett-Packard’s VPN Server appliance, RapidStream’s 2000, RedCreek’s Ravlin 7160 and WatchGuard’s FireBox III 4500 every failed their certificates interoperability test. within the case of RedCreek and WatchGuard, neither appropriately helps exterior certificates for web page-to-website authentication.
Microsoft’s home windows 2000 Server with its built-in VPN carrier and Lucent’s entry constituent supported certificates, however had pickle talking to different certificates-aiding products. as an instance, with Lucent’s entry factor, they needed to drop back to preshared secrets (a extra suitable however much less fascinating authentication device) when speaking to Avaya and Nokia. additionally, the Lucent product failed when speaking to Cisco’s snap shots with their desired coverage.
HP moreover had problems involving extraordinary configuration requirements in its IPSec implementation. HP both desires to always initiate the IPSec protection association, or in no course excite the security association. In web site-to-web page networks, here's infrequently the style things work. accordingly, they had a tough time retaining HP security associations, because of collisions when changing keys.
WatchGuard and RapidStream moreover had negative interoperability consequences. In WatchGuard’s case, its unchangeable default protection policy turned into insecure since it makes consume of data Encryption indifferent (instead of Triple-DES) encryption and Diffie-Hellman neighborhood 1, so they had to develop a discrete case configuration in every other products to healthy the WatchGuard inflexibility. RapidStream 2000 gave us incompatible results, now and again accepting protection associations and then failing to flow site visitors, occasionally working perfectly.
commercial enterprise Manageability
As VPNs traipse out of pilot mode into implementation, configuration and management of dozens or even a total lot of VPN gadgets becomes a huge concern. The best three products they Verified which stand GUIs fitting for multisite, multivendor VPN management were Avaya, verify aspect and Nokia. They took into account how these tools managed seller-particular gear and how well each assisted in their interoperability scenarios.
Avaya and Nokia rose to the proper of the trade configuration stack instantly. both administration tools consume fundamental pile blocks to contour VPN network topology.
We created, modified and managed multivendor VPN configurations effectively with these tools. Nokia’s VPN coverage supervisor GUI permits you to build complicated topologies: combos of hub-and-spoke; mesh; links between the two; and individual tunnels between any two methods.
Avaya’s GUI presents much less topological vigor, however has a better back conclusion. constructed on properly of a lightweight listing access Protocol server, this product lets numerous community managers view, edit and thrust changes to a huge network from varied websites. Avaya’s VPN manager GUI additionally has a developed-in customer deployment and administration device for remote entry VPNs. Nortel’s Contivity 1600 has a similarly efficient device in-built, however the scope does not embrace multiple VPN safety gateway.
We evaluated examine factor’s lately released version of VPN-1 and had been joyful to peer that the enterprise has approach a protracted manner in terms of VPN configurability and administration seeing that they looked at its V4.1 GUI past this yr. assess aspect’s policy Editor GUI can now deal with a larger purview of interoperability scenarios. despite the fact they tracked down a number of bugs in the new utility, their established stamp is that verify aspect is focusing greater on significant VPNs. The examine aspect GUI can with no misfortune generate meshed VPN topologies – a significant improvement from the V4.1 GUI, which tightly limited a VPN manager’s flexibility in identifying operating parameters.
check element’s management utensil moreover makes it viable for integration of firewall guidelines and VPN settings. besides the fact that children examine element’s product does not assist the finished array of protocols and contours that Lucent’s entry aspect does – which permits you to stack firewalls and VPN tunnels in any configuration you’d ever requisite – it handles 90 per cent or extra of the configurations most enterprise managers would dream up. The capability to categorical firewall filtering and VPN tunnelling within the identical rule is an essential constituent in merging VPN and firewall coverage.
several of the VPN administration paraphernalia had been not very valuable in their interoperability quest. Nortel’s famed Optivity utensil is decent for doing things to multiple Contivity containers without having to the handle every one, however doesn’t basically carry out anything else for web site-to-site VPN configuration, even the residence best Nortel techniques are blanketed. here's unlucky as a result of Nortel’s factor administration (by means of a native internet server on the Contivity system) is the best system administration device of any product they evaluated. If Nortel could extend that management to multiple systems, it will stand the knock- down winner in this category.
Lucent’s optional QVPN Builder GUI went the distance when it comes to managing a network of VPN contraptions as a single unit, but had a crucial flaw: It turned into not designed to stand anything else however Lucent access features in the community. as a result of this, they fell again to Lucent’s command-line interface (CLI) for configuration. lamentably you can’t consume each the QVPN Builder and the CLI; you must pick one. HP’s administration utensil for its VPN Server paraphernalia has an analogous restrict: It has some primitive capabilities to solemnize a single policy to varied techniques but does not stand any solution to integrate non-HP items into the configuration. WatchGuard’s not obligatory VPN manager software leaves network managers in a lot the equal boat. the inability of firewall integration of the VPN configuration additionally left us dissatisfied because WatchGuard’s firewall configuration is so essential and intuitive.
Microsoft’s VPN management is removed from fundamental and intuitive. even though it is viable to create a single IPSec policy that may live utilized to discrete systems – as long as they're every Win 2000 servers – the GUI is knotty and confusing. After ninety two displays, they silent couldn’t toil out no matter if it changed into stronger than the competition. Frankly, any protection configuration device this advanced is asking for an error to spin up, which is unacceptable in an commercial enterprise community.
Cisco’s new Cisco secure coverage supervisor could live a fine boon to any network manager attracted to using both Cisco graphics or its IOS-based mostly techniques as a firewall or VPN. With Cisco’s CLI syntax a limited bit discrete from and incompatible with IOS to images, Cisco comfy policy manager wins foremost points for making it feasible to design and synchronize firewall rules and intrusion-detection programs across dissimilar Cisco programs. during this case, notwithstanding, “viable” doesn’t imply “ideal”.
Cisco secure policy supervisor has committed paraphernalia for pile VPN tunnels. both mesh and hub-and-spoke topologies are supported. unfortunately, there is no wait on for third-celebration VPN products – you ought to fake out Cisco comfy coverage manager through describing them as Cisco points. greater importantly, the VPN configuration isn't smartly integrated with the firewall guidelines.
other enterprise elements
No VPN exists in a vacuum. VPN services may wish to live mixed with other components of the trade community. typical additions to VPN instruments on the market consist of firewalls, high-availability points, routing protocol aid, bandwidth management and nice of service (QoS), diverse interface alternatives (besides quickly Ethernet, which is most normal), and tunnel fame monitoring and reporting. Technically, these don't look to live VPN-particular aspects, however enterprise managers will ascertain them positive adjuncts in their quest to build extra efficient and equipped networks.
One obvious winner within the “how many elements can they add to a single field” online game is Cisco. Its IOS-primarily based product contains VPN capabilities as a sideline, with industry-leading routing, distinctive interfaces, elevated availability, site visitors shaping and firewall every built into the identical equipment.
Microsoft’s Win 2000 Server could even live considered the characteristic king – what different VPN device can moreover hasten PowerPoint and Flight Simulator? while more crucial aspects, reminiscent of primary routing protocols, traffic prioritization and basic firewall, are effortlessly purchasable, Win 2000 Server has an erudition when it involves database operations for remote clients. because the Win 2000 VPN software is completely integrated with the home windows energetic listing authentication equipment, access manage for far flung clients will moreover live tightly managed and managed from any Win 2000 gadget.
The obvious combination of VPN and firewall facets makes collocation more the guideline than the exception, with practically each product they reviewed having at least confined firewall capabilities. both holdouts are Nokia and RedCreek. (RedCreek announced an integrated firewall in its VPN product as this overview become going to press.) They discovered determine constituent and cozy Computing’s tactics the simplest to capture dependence of. both present an built-in firewall and VPN rule set. WatchGuard and HP are examples of the different extreme: The firewall and VPN are totally part and disconnected capabilities, which capture residence to partake a GUI and sit down on the same system.
Routing is another enviornment where integration between firewall and VPN is important. items enjoy Nokia’s CryptoCluster and verify aspect’s VPN-1 stand no exact inner connection between routing protocols and VPN fame – tunnels approach up, tunnels proceed down and the routing algorithm is no one the wiser for it. Lucent’s entry point does a brilliant job of integrating both, representing tunnels as interfaces, which lets the routing system propagate tips about the condition of the VPN. This may moreover live crucial when a VPN tunnel is a component of a again-up strategy or when diverse redundant paths exist across a VPN. In simultaneous versions, Cisco’s VPN items stand brought identical integration.
excessive-availability services discrete between products. Nokia, the unchallenged leader of the excessive-availability load sharing cluster, makes a speciality of reliability at a single point in the network. other companies, including Avaya and Nortel, built in reliability from a multisite or multilocation factor of view.
service-stage monitoring and reporting can moreover live necessary in at ease trade networks. Lucent and investigate point stand built-in tools to pomp screen the latency and loss expense of VPN tunnels and maintain an internal database of performance data that will moreover live used for lengthy-term charting or alerting applications.
QoS is another commercial enterprise-degree feature that varies amongst products. as an example, several of the VPN protection gateways they evaluated stand the skill to imprint Differentiated carrier bits on packets. Avaya’s VSU series does this, but gained’t change its packet dealing with alternate options according to QoS markings. here is essentially useful where other components within the network manipulate bandwidth management. other items, together with Nortel’s Contivity and Cisco’s IOS, imprint and designate bandwidth to tunnels according to configured-in guidelines.
We’ve institute – both during this and in previous exams – that performance of VPN instruments varies extensively. in lots of circumstances, carriers purposefully understate performance to drive sales to greater costly instruments; in different instances, they overstate performance to develop their products loom greater competitive. whereas they didn't conduct a complete suite of performance tests – as that was no longer their simple purpose for this assessment – they did capture the probability to hasten some quick benchmarks to present apples-to-apples comparisons of these items.
We ran three units of performance numbers, evaluating behaviour in choicest-case and worst-case packet flows, in addition to with a customary cyber web combine. For the web mix, they used information accrued from a web spine to construct a profile of about 50 per cent diminutive packets (96 octets or much less), 10 per cent giant packets (1,518 octets, the Ethernet maximum transmission unit), 20 per cent 576 octets (a typical WAN MTU) and 20 per cent different between 192 and 1,024 octets.
We discovered that for line speeds of as much as 10Mbps (full duplex, about a quarter of a DS-three/T-3 circuit), any of the items can sustain – however Avaya, Nortel, RapidStream and Microsoft supply you striking price/performance ratios.
in case you want to thrust to a replete DS-three circuit (45Mbps, replete duplex), again the usage of “real world” packet sizes, handiest Lucent’s entry point with dual cryptographic accelerators and the one-two punch of Win 2000 mixed with Intel’s professional/100S cryptographic network interface playing cards (NIC) beat the 90Mbps crucial to tackle that circuit. by course of adding below US$200 value of hardware to their gadget, they drove complete IPSec efficiency of Win 2000 as much as more than 160Mbps in the optimal case (colossal packets). Given the respectable value of Pentium-based mostly PCs, Win 2000 Server utility and the Intel NICs, this particular packaging carried out expense/performance ratios between 10 and 20 times more suitable than the other providers’. youngsters, they solemnize that their performance exams stand been accomplished with simplest six IPSec safety associations. As a critical web site paraphernalia with 500 protection associations, they saw complete efficiency of their Win 2000 device drop dramatically to below 8Mbps for the information superhighway combine.
Nokia offers a load-sharing product and they tested it in two techniques: as a single stand-alone device (a single CryptoCluster 2500) and as a cluster (three clustered CryptoCluster 2500s). The results had been fairly dramatic, displaying practically linear growth in performance together with growth in cluster dimension.
Breadth of Product Line
business community managers often deserve to amalgamate every thing from dial-up modems to 155Mbps OC-three strains in the identical community. For that reason, a one-measurement-suits-all strategy received’t toil within the actual world. here's one intent multivendor interoperability is so critical: Small-workplace/home-workplace (SOHO)-sized items from providers corresponding to RedCreek and WatchGuard may well live the appropriate fitting for some elements, possibly speaking again to gigabit behemoths enjoy the Nokia 5205.
at the same time, a single vendor immensely simplifies administration, as they saw so dramatically, and a great product line can moreover live a crucial talents. hence they additionally appeared on the breadth of VPN product line in their rating equation. They desired to know how smartly companies’ product traces reached up to data-centre-sized encryption engines and stretched perquisite down to the SOHO market with in your expense purview criterion devices. They moreover evaluated how smartly community media other than the vanilla quick Ethernet had been protected: WAN interfaces corresponding to T-1/T-3 and ISDN can live vital in maintaining expenses down, whereas Gigabit Ethernet is vital for the excessive-conclusion records centre.
The obvious winner in this region is Cisco’s IOS. With more than a dozen chassis alternatives, products starting from lower than US$1,000 to the cyber web-core-sized GSR 12000, with its six-figure rate tag, and interfaces starting from developed-in modem as much as Gigabit Ethernet – nobody beats Cisco’s IOS when it involves breadth of product line.
although, elevated ratings during this category don’t always equate to the same degree of flexibility, so investigate what hardware and speeds you requisite during this enviornment carefully. for instance, Cisco’s photographs 525 rated well on account of the immense number of simultaneous interfaces supported, whereas Nokia’s CryptoCluster 2500 received the identical score as a result of they stretch from department workplace to information centre in pace – besides the fact that children Nokia handiest supports two interfaces on its programs.
This assessment indicates there is scope within the VPN marketplace for more than a handful of carriers. every product evaluated has certain strengths and weaknesses; each is designed with a special ilk of community, management style, VPN dimension and set of requirements in intellect.
commonly, far flung entry client interoperability is not a mountainous problem. Most groups stand most efficient a diminutive variety of far flung access gateways and should typically opt for a single dealer to supply the gateways for his or her clients. The customer software supplied by means of the gateway supplier is then the obtrusive option for the company.
Two groups stand made a trade of offering interoperable purchasers for IP protection (IPSec) entry to trade networks. Safenet (previously IRE) sells its windows-simplest client in an aftermarket configuration to many VPN vendors. community pals’ PGP division offers home windows and Macintosh types of an IPSec customer software. They invited Safenet to approach in for a brief interoperability verify to survey how neatly things would work.
effects were mixed. within the foremost case, Nokia and investigate factor utility gateways capture Safenet as a completely compatible customer appropriate out of the starting gate. Some gateways, together with these from Nortel, Lucent, Cisco and cozy Computing, required that they develop minor adjustments to their profiles earlier than they might address Safenet valued clientele correctly. different gateways, similar to these from Avaya, Microsoft and Hewlett-Packard, were unfriendly to overseas valued clientele. They wouldn’t toil unless the client gave the examine of a gateway with a static IP handle, which isn't often advantageous for far off access customer configurations. eventually, other companies, together with Cisco with its graphics entry, the configuration of the paraphernalia changed into so limited that by adding customer compatibility they broke web page-to-website interoperability.
How They Did It
We used paraphernalia from Cubix and Spirent Communications to construct a verify mattress surrounding the VPN security gateways beneath test. They used the Cubix Density paraphernalia operating customized utility to create VPN tunnels, check connectivity between the gateways, measure up-time and pomp the total connectivity matrix.
We developed their test methodology with engineers from the VPN Consortium and will current a demonstration of this interoperability verify at the upcoming VPNCON change demonstrate in Alexandria, Va., from Oct. 15 to 18.
We created an IP protection (IPSec) profile, which they deem a prudent network manager would want for a corporate VPN network.
This profile protected information superhighway Key exchange encryption algorithm of Triple-records Encryption criterion and authentication of at ease hash algorithm 1 (SHA-1) using Diffie-Hellman neighborhood 2 (MODP-1024) and a lifetime of eight hours; IPSec encryption algorithm become Triple-DES, authentication became SHA-1, ultimate forward secrecy became enabled for Diffie-Hellman group 2, and lifelong was one hour.
Our examine bed comprised numerous statistics centres and department workplaces with switches, routers and firewalls. They demonstrated the interoperability of each product against each different VPN product both in establishing initial VPN connections and in holding lengthy-term operation over a yoke of days. mainly, they rated how every product labored with each other product, with their certificate authority and regularly occurring VPN client software, and how well distinctive VPN authentication strategies labored in their hypothetical community.
To manipulate authentication of the security affiliation, they used an Entrust public-key infrastructure (PKI) to traipse out digital certificates to each and every protection gateway. because Entrust’s PKI corners a major partake of the market, it was in your expense purview to are expecting every devices to wait on it, at the least in manual enrolment mode. Some gadgets supported criterion certificates enrolment protocol enrolment to their Entrust PKI; with others, they used manual enrolment to the Entrust server. They used preshared secrets for authentication in circumstances where the security gateway didn't wait on digital certificates (or their Entrust PKI).
To tangle performance for these gadgets, they used a collection of six Nokia CryptoCluster 2500 gateways in opposition t each paraphernalia being demonstrated. This configuration is satisfactory to saturate a 100Mbps full-duplex Ethernet network with sixty four-octet packets. They generated consumer Datagram Protocol (UDP) packets of a considerable number of sizes the usage of Smartbits apparatus and off-the-shelf verify software, and measured when loss went above 0.1 per cent the consume of a precision of 2Mbps.
Joel Snyder is a senior accomplice at Opus One in Tucson, Ariz. He may moreover live reached atJoel.Snyder@opus1.com.related down load Sponsor: EDCCreate a different selling Proposition to your global Market
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AppSense [1 Certification Exam(s) ]
APTUSC [1 Certification Exam(s) ]
Arizona-Education [1 Certification Exam(s) ]
ARM [1 Certification Exam(s) ]
Aruba [8 Certification Exam(s) ]
ASIS [2 Certification Exam(s) ]
ASQ [3 Certification Exam(s) ]
ASTQB [8 Certification Exam(s) ]
Autodesk [2 Certification Exam(s) ]
Avaya [106 Certification Exam(s) ]
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BlackBerry [17 Certification Exam(s) ]
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Business-Objects [11 Certification Exam(s) ]
Business-Tests [4 Certification Exam(s) ]
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Certification-Board [10 Certification Exam(s) ]
Certiport [3 Certification Exam(s) ]
CheckPoint [44 Certification Exam(s) ]
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Citrix [48 Certification Exam(s) ]
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Cognos [19 Certification Exam(s) ]
College-Board [2 Certification Exam(s) ]
CompTIA [79 Certification Exam(s) ]
ComputerAssociates [6 Certification Exam(s) ]
Consultant [2 Certification Exam(s) ]
Counselor [4 Certification Exam(s) ]
CPP-Institute [4 Certification Exam(s) ]
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CWNA [1 Certification Exam(s) ]
CWNP [14 Certification Exam(s) ]
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FCTC [2 Certification Exam(s) ]
Filemaker [9 Certification Exam(s) ]
Financial [36 Certification Exam(s) ]
Food [4 Certification Exam(s) ]
Fortinet [16 Certification Exam(s) ]
Foundry [6 Certification Exam(s) ]
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GIAC [15 Certification Exam(s) ]
Google [5 Certification Exam(s) ]
GuidanceSoftware [2 Certification Exam(s) ]
H3C [1 Certification Exam(s) ]
HDI [9 Certification Exam(s) ]
Healthcare [3 Certification Exam(s) ]
HIPAA [2 Certification Exam(s) ]
Hitachi [30 Certification Exam(s) ]
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Lotus [66 Certification Exam(s) ]
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Microsoft [387 Certification Exam(s) ]
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Military [1 Certification Exam(s) ]
Misc [1 Certification Exam(s) ]
Motorola [7 Certification Exam(s) ]
mySQL [4 Certification Exam(s) ]
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NCLEX [3 Certification Exam(s) ]
Network-General [12 Certification Exam(s) ]
NetworkAppliance [39 Certification Exam(s) ]
NI [1 Certification Exam(s) ]
NIELIT [1 Certification Exam(s) ]
Nokia [6 Certification Exam(s) ]
Nortel [130 Certification Exam(s) ]
Novell [37 Certification Exam(s) ]
OMG [10 Certification Exam(s) ]
Oracle [299 Certification Exam(s) ]
P&C [2 Certification Exam(s) ]
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PayPal [1 Certification Exam(s) ]
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Polycom [2 Certification Exam(s) ]
PostgreSQL-CE [1 Certification Exam(s) ]
Prince2 [7 Certification Exam(s) ]
PRMIA [1 Certification Exam(s) ]
PsychCorp [1 Certification Exam(s) ]
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QlikView [1 Certification Exam(s) ]
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See-Beyond [1 Certification Exam(s) ]
Siemens [1 Certification Exam(s) ]
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SOA [15 Certification Exam(s) ]
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Teacher-Certification [4 Certification Exam(s) ]
The-Open-Group [8 Certification Exam(s) ]
TIA [3 Certification Exam(s) ]
Tibco [18 Certification Exam(s) ]
Trainers [3 Certification Exam(s) ]
Trend [1 Certification Exam(s) ]
TruSecure [1 Certification Exam(s) ]
USMLE [1 Certification Exam(s) ]
VCE [7 Certification Exam(s) ]
Veeam [2 Certification Exam(s) ]
Veritas [33 Certification Exam(s) ]
Vmware [63 Certification Exam(s) ]
Wonderlic [2 Certification Exam(s) ]
Worldatwork [2 Certification Exam(s) ]
XML-Master [3 Certification Exam(s) ]
Zend [6 Certification Exam(s) ]
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