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Test Code : 000-274
Test Name : IBM WebSphere DataPower SOA Appliances Firmware V5.0 Solution Implementation
Vendor Name : IBM
: 75 Real Questions

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IBM WebSphere DataPower SOA Appliances Firmware V5.0 Solution Implementation certification

typical Usages of appliances | 000-274 Real Questions and VCE Practice Test

This chapter is from the ebook 

whereas the home equipment are rather versatile and might hence be used to solve various types of complications (and implementers have been rather artistic in this regard), they find there are just a few regular use cases which are ordinary. These generally center of attention around security, performance, charge discount rates, and integration. In right here sections, they focus on every of those in more element.

solving safety complications

Let’s feel about what it might take to install a application-based proxy product in the DMZ. every of the layers of the ‘typical server’ shown in figure 1-2 requires really good capabilities to install and hold. specifically for DMZ deployments, the server hardware itself ought to be hardened. In tremendously comfy environments, this may contain eliminating any accessories that could enable counsel to be taken from the server, reminiscent of USB ports and writeable CD/DVD drives. The operating system have to also be hardened, putting off components such as telnet and sendmail.three regularly, this outcomes in different layers of the application stack no longer installing or working accurately! if you are a success in setting up the software utility stack, it need to be hardened as neatly. These are standard requirements for prime security environments similar to economic corporations, intelligence services, and military applications.

despite the fact software-based mostly DMZ accessories may also be hardened efficiently, it's a lot of work. evaluate this with the simplicity of installing a committed, enormously at ease hardware equipment, purpose constructed to do just a few issues well with relatively basic administrative interfaces, as proven in determine 1-3.

The appliances are hardened out of the box. for example:

  • they're designed with safety in mind from the floor up, before the rest.
  • they're shipped at ease by using default; nearly each feature is disabled, including the network adapters and administrative interfaces (apart from the serial port used to do initial bootstrap). in case you want some thing, you ought to flip it on!
  • they have got an encrypted file system.
  • They have no Java, print capabilities, or shareable file gadget.
  • they are tamper-proof—chickening out the screws on the case disables the equipment.
  • they have got really expert comfortable handling of crypto keys and certificates.
  • they have got an embedded operating equipment, now not prone to time-honored exposures of ordinary OSs.
  • They reject messages by way of default, except in particular authorized by way of configured guidelines.
  • The age-historic rule for the DMZ is to terminate customer connections there and then proxy connections to the backend from the relied on DMZ servers. despite the fact, within the field they locate much more stringent protection policies that don't warrant any site visitors (even proxied via these comfortable intermediaries) to the backend unless the client is authenticated and certified. this is known as perimeter security and is an increasingly regular requirement, driving earnings of DMZ safety products comparable to TAM. Later, they display how DataPower appliances can also clear up this difficulty.

    a further requirement for DMZ add-ons is to virtualize or hide the implementation particulars of backend servers and purposes. ordinary DMZ products have interaction most effective with the protocol layer of the network stack, on the way to disguise issues like hostname/IP, ports, and URIs, whereas XML-centric software proxies comparable to DataPower home equipment can virtualize on a lots extra clever groundwork and may analyze the total message flow.

    a robust explanation for the usage of these kinds of appliances is the burgeoning risk of methods becoming compromised via XML-based mostly threats. simply as once upon a time they felt HTTP to be innocuous, today they are vulnerable to underestimating what will also be carried out by way of advantage of XML. In Chapter 20 “XML Threats,” they display how complete infrastructures can be brought down using small, simple, smartly-fashioned XML information. simplest hardware appliances have the processing power to check for the many adaptations of XML threats.

    an additional normal protection problem is a mismatch in the specification levels or credential formats of numerous applied sciences throughout huge company IT infrastructures. for example, trust a marketing IT silo running on Microsoft®.net the use of WS-protection 1.0 and SPNEGO credentials for id and a producing silo the usage of IBM WebSphere application Server (become), WS-security 1.1, and LTPA credentials for identity. In these days’s ESB-pushed SOA architectures, a single transaction can also need to flow via both environments, so this presents challenges. as a result of DataPower appliances comprise a wide array of the latest specification implementations and credential formats, they can be used to transform messages and credentials to fit the target each step of ways. notice that this can also be used to achieve pass-platform single-signon (SSO), besides the fact that children that also depends on different elements akin to having a typical registry.

    To lessen complete charge of ownership (TCO)

    Refer again to the scenario in figure 1-2, where there are a lot of knowledge required to deploy and retain a regular server and application stack. Now feel of this when it comes to the staff required and price to the corporation. With self-contained home equipment the place the working gadget and file system qualities are beside the point from an administrative viewpoint, this turns into much less work. The characteristic of the appliances is dedicated and streamlined, hence the executive initiatives and interfaces are usually as well. for example, within the scenario in determine 1-2, you have to consistently installation fixes and updates at each layer of the stack. youngsters, for appliances, you typically do this by way of importing a small firmware update and rebooting, which takes simplest minutes. within the server state of affairs, you have got distinctive different administrative consoles to manipulate the layers of the stack; with the home equipment, you have just one console.

    The TCO return does not solely present itself in the setup and administration of the platform. agree with the silo example in the prior section—the place a considerable number of areas of a company IT infrastructure are operating web services throughout diverse platforms, corresponding to these from IBM, Microsoft, and BEA. If the supplier has one set of policies for protection and SLM that deserve to be implemented across all these structures, then it ought to be completed dissimilar times, by numerous americans, with talents on each platform. now not only is the configuration redundant and hence costly, but this problem is repeated each time it needs to alternate, and there's all the time the chance that the policy are not carried out the exact same on every platform, which can cause security holes or software failures. here's depicted in figure 1-4.

    Figure 1-4

    figure 1-4 Redundant administration versus simplified appliance mannequin.

    A more concrete example may also be applied via creating a single provider that acts as an internet service proxy on the DataPower equipment, importing the WSDL files for the internet functions suppliers on every of those backend platforms, and then applying the protection and SLM policies on the proxy, thereby gaining coverage definition and enforcement one time for all structures. All here's based on necessities that they focus on later, now not best web features itself, however also the accompanying standards corresponding to WS-safety for safety, WS-coverage for coverage definition, WS-Addressing for endpoint decision, and WS-management and WSDM4 for management.

    improving performance

    XML is the groundwork on which many contemporary architectures are developed—it has developed into soap for net functions and is discovered throughout the breadth and depth of the SOA stack and linked standards. Over time, it has advanced from a simple markup language to whatever thing fairly complicated and sophisticated. Of path, the problem as far as efficiency is concerned is that XML is fairly convenient for humans to examine, but now not for computer systems. it's a verbose illustration of information and frequently requires big supplies in terms of CPU vigor and memory to manner. This overhead is typically found in parsing the XML document into an in-reminiscence illustration and in validating the XML towards its schema file.5

    agree with the affect of parsing and validating the storm of XML/cleaning soap files that hit your techniques right through top construction tiers. Now consider the overhead of safety that may be embedded in these messages—validating customer identities towards LDAP servers, verifying digital signatures, and decrypting encrypted information. This requires an enormous quantity of processing power and time and robs valuable cycles away from what your backend systems should really be doing—focusing on transactional enterprise good judgment! also trust the absolute waste of expending these cycles for messages that come in badly shaped, with schema violations or illegitimate protection issues. The cycles expended on processing them and coping with the error are wasted. determine 1-5 shows a graph demonstrating the CPU overhead of a lot of average projects. (word the parsing stage is low here—the leading hit when parsing is memory utilization.) notice the impact of security operations. This can be helped a little with hardware-assisted acceleration, however the cost-improvement of hardware acceleration boards is often debated. also observe that abusing these security points to devour CPU supplies is one way of mounting assaults.

    A grand solution for this, of direction, is to use home equipment to do all that heavy lifting at near wire speed. As you're going to see after they focus on the equipment qualities, they are amazingly quickly and might address these projects at orders of magnitude quicker than utility-based mostly options operating on normal servers. Now focal point on an extra scenario—one where the equipment makes sure that best clear traffic gets to the backend methods. think about the large differential in obtainable processing energy on the backend if the validation and security initiatives are performed by the time the traffic receives there. The appliances can validate schemas, determine signatures, decrypt the information, and greater. this may regularly influence in big efficiency returns, depending on considerations reminiscent of message sizes, cipher strengths, community latency, and so on.

    talking of message sizes, here is often another most important stumbling block for Java-based mostly software techniques processing XML. In up to date day actual-world programs, they are actually seeing large soap messages on the order of hundreds of megabytes or even gigabytes in measurement. The conundrum is how to procedure these, given constraints on maximum JVM heap sizes in lots of structures. due to aggressive developed-in streaming and compression, appliances can tackle messages higher than their actual reminiscence house.

    On an extra message-connected theme, trust applications that do XML transformation between differing schemas; for instance, an utility that consumes XML purchase orders and should take into account quite a lot of incoming buy order formats from business companions, after which transforms each and every into the one “golden” purchase order schema that this company uses. These transformations may also be fairly costly to procedure (see figure 1-5) and influence in bloated application code. they all recognize that line-for-line, utility code is costly when it comes to programmer time, testing, and debugging. Now agree with the impact on the utility if the transformations had been moved out to the equipment on the frontend so that the backend application now receives handiest the one “golden” schema format. yes, their software has long gone on quite a weight loss program, is less expensive to hold, and is tons faster. One box state of affairs consisted of a frontend cluster of Java EE purposes to do such transformations to preserve the cluster of company common sense functions behind it light-weight. besides the fact that children, considering this was running on a platform that charged for CPU time, and given the overhead of XML transformations proven in determine 1-5, it turned into high priced. The answer become to stream the transformation layer out to DataPower appliances. The outcomes become a massive can charge mark downs and orders of magnitude faster processing.

    Integrating systems

    within the previous area, they mentioned a scenario wherein the appliance could be used to bridge variations in specifications necessities (WS-protection v1.0 versus. v1.1) and identification credentials (SPNEGO versus LTPA) throughout techniques. this is one first rate illustration of readily integrating disparate systems, mainly when the standards and necessities are in flux. it's elaborate for software-primarily based solutions operating on average servers and items to keep up with this. On the equipment, you load a firmware replace to get the latest and ideal.

    besides the fact that children, there are other issues that come up when integrating different structures. consider a state of affairs wherein a medium-sized enterprise XYZ Corp has its infrastructure operating on legacy systems and technologies, in all probability mainframe-based mostly EDI. The company partners that they depend on have lengthy considering the fact that moved their structures to web services and are telling terrible XYZ Corp that they could now not come up with the money for to assist XYZ’s legacy interface to that gadget, and that they ought to supply a modern SOA or internet features interface or lose the company. This places XYZ in a nasty place; what is going to it cost to retrain its programmers, rewrite its COBOL applications, and revamp the backends to its Java EE systems? likely, it will be a fantastic volume! a common answer to this difficulty is to area appliances at the entrance of the community as proxies, cook dinner up a WSDL file to explain some internet features, start receiving the ASCII cleaning soap messages from the now-chuffed business partners, and convert them on-the-fly to EBCDIC EDI or COBOL Copybook messages and send them over MQ or IMS connect to the legacy backend. The backend doesn't need to trade, and no classes must be rewritten—a win-win!

    as a result of the variety of protocols (HTTP(S), FTP, MQ, JMS/JFAP, IMS, NFS, TIBCO, MQ, ODBC, SNMP, etc) supported by using the DataPower home equipment, there's a wealth of probability for protocol bridging, content material enrichment, and integration between systems. be aware that the old scenario involved message transformation. The XI50 DataPower appliance can tackle either XML-to-XML or non-XML transformation scenarios, meaning that messages can be converted to the acceptable format for any meant backend.

    a different ordinary and age-ancient scenario concerning integrating systems is dynamic routing. since it is often a requirement to make dynamic routing selections “on the fringe of the network,” we've DMZ net servers, proxies, and cargo balancers deal with this. The issue is that they could remember handiest the protocol and not the payload of the message. to achieve the aim, purposes location some value within the protocol header to facilitate the content material-based mostly routing. for instance, if they want any purchase orders over one million bucks to be routed to excessive-precedence servers, the sending software would location a cookie or attribute in an HTTP header or URL parameter. The net server, proxy. or load balancer in the DMZ would be configured to determine for this and then route the traffic thus. The difficulty with this situation is that you simply should put this hack within the applications and the HTTP payload, doubtlessly reveal message records to attackers, and contain the sender/client. This answer doesn’t scale as a result of in case you continually do that, the HTTP header and application code bloat.

    as a result of SOA home equipment are XML-savvy and can use technologies equivalent to XPath, they can determine inside the message payload to look for the exact <po_value> point instead of alter the software and HTTP header. If the message is encrypted, you don’t should expose this by using externalizing the data; you can just decrypt the message and assess the cost, after which route consequently. The client in this case does not have to be complicit—the routing is really dynamic and transparent. The XML mindful network layer is proven in determine 1-6.

    One ultimate essential function in regard to the integration story is using home equipment as ESBs. The appliances fulfill the mannequin of an ESB by way of virtue of their effective routing, transformation, mediation, and protocol-switching capabilities. IBM has different ESB products able to imposing the ESB sample—WebSphere Message broking service (WMB) and WebSphere commercial enterprise carrier Bus (WESB). each and every of these have enjoyable capabilities that may additionally swimsuit them for specific usages. youngsters DataPower could be concept of as a enormously at ease and performant ESB, the others have elements that DataPower doesn't have within the arenas of transactionality, persistent message handling, and the capability to work in different programming languages. They discuss ESBs in Chapter 5, “ordinary DataPower Deployment Patterns,” and Chapter 9, “Multi-Protocol Gateway.”


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