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650-669 - Cisco SP Video Digital Media Design(R) Specialist for SE - Dump Information

Vendor : Cisco
Exam Code : 650-669
Exam Name : Cisco SP Video Digital Media Design(R) Specialist for SE
Questions and Answers : 33 Q & A
Updated On : February 22, 2019
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650-669 Cisco SP Video Digital Media Design(R) Specialist for SE

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650-669 exam Dumps Source : Cisco SP Video Digital Media Design(R) Specialist for SE

Test Code : 650-669
Test Name : Cisco SP Video Digital Media Design(R) Specialist for SE
Vendor Name : Cisco
Q&A : 33 Real Questions

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Cisco Cisco SP Video Digital

Cisco live 2019 Closes its doorways After a highly successful Week | killexams.com Real Questions and Pass4sure dumps

It’s been a busy week! Cisco reside 2019 at last drew to a close remaining Friday after five days filled to the brim with technical presentations, workshops, networking activities and greater. For carrier suppliers, it become a wealthy chance to find out about Cisco’s strategic vision from our excellent-degree executives, while additionally gaining particularly technical product tips and insights from our engineers. if you’ve missed the event, watch this summary video!

The undeniable fact that essentially 1-in-5 Cisco are living attendees had been provider providers, attests that here's now a massively enormous event for our service suppliers, with greater than 30% boost in attendees in comparison to last yr. For the primary time, we had a provider company Opening Session, the place Jonathan Davidson, SVP of Cisco’s provider provider company, delivered a compelling keynote on Reimagining provider issuer Infrastructure.

provider issuer Opening Session

probably the most typical areas at the experience itself changed into the provider issuer Hub within the World of options zone. The hub become packed out during the week and offered first-hand journey of the transition to 5G. certain solutions on display covered 5G community reducing to aid the needs of different functions and use instances; agility through NFV deployment; automation and the way to in the reduction of fees; and use cases on the way to make cash, such because the deployment of SD-WAN solutions. take a look at these extra components involving our demonstration content material:

carrier provider on the World of options

all through the week we have been additionally capable of show how we continue to extend partnerships. Our shoppers have been keen to share and trade their personal reports providing a powerful endorsement of our collaborative partnership strategy, and our capability to meld enterprise experience with technical abilities.

dwell up to date on the newest carrier providers use circumstances, consumer testimonials, product announcements and answer particulars by means of visiting our carrier issuer site.

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Cisco’s EMEAR chief shines mild on international digital transformation | killexams.com Real Questions and Pass4sure dumps

If Cisco systems Inc. is to reap the merits from its investment in aid management and network automation throughout the cloud computing landscape, it'll need assist from its companion network. The channel relationships that the networking gigantic has developed through the years are a familiar resource to Wendy Mars (pictured), who stepped into her latest function ultimate fall as president of Europe, core East, Africa and Russia at Cisco after in the past guiding EMEAR partnerships for the business.

The journey gave Mars an intensive understanding of the transformation taking area in enterprise computing today and the evolution of Cisco’s approach to contend with it.

“It’s a enormous transition that’s going on within the trade ordinary,” Mars noted. “We’re now not simply altering for the sake of trade. We’re changing since the market is asking us to do that.”

Mars spoke with John Furrier (@furrier) and Dave Vellante (@dvellante), co-hosts of theCUBE, SiliconANGLE Media’s mobile livestreaming studio, during the Cisco are living event in Barcelona, Spain. They discussed key topics heard from valued clientele experiencing digital transformation, the becoming magnitude of information privateness on a worldwide scale, and exquisite Britain’s competencies departure from the eu Union. (* Disclosure below.)

offering networking price

Cisco’s bulletins this week, with a spotlight on extending its synthetic intelligence-fueled, intent-primarily based networking options, coupled with continued emphasis on enterprise security, are certainly designed to meet the want for exchange expressed by way of international shoppers.

“a relentless theme we hear is the desire and appetite to gain improvement from transformation, the digital transformation, and what the cost of that can also be,” Mars defined. “Realizing the cozy clever platform is absolutely resonating.”

Emphasis on facts privateness, as exemplified via European necessities such because the regular data insurance plan rules, has also been a key aspect as Mars guides accomplice and consumer relationships in EMEAR.

“The magnitude of your information and the place it resides, being able to reveal the integrity and the great of that statistics, is extremely essential,” Mars noted. “It’s most effective going to become extra severe as we go forward.”

one of the crucial predominant considerations at the moment affecting the european industry is Brexit, a notion for the UK to go away the european Union in 2019. “We’re very accepted with working with these styles of instances and instances,” Mars pointed out. “The U.ok. remains for us a very essential market and may proceed to be.”

Watch the finished video interview beneath, and make sure to try greater of SiliconANGLE’s and theCUBE’s insurance of the Cisco reside experience. (* Disclosure: Cisco programs Inc. backed this section of theCUBE. Neither Cisco nor other sponsors have editorial handle over content material on theCUBE or SiliconANGLE.)

image: SiliconANGLE seeing that you’re here … … We’d like to tell you about our mission and the way you can assist us fulfill it. SiliconANGLE Media Inc.’s company mannequin is in keeping with the intrinsic value of the content, not advertising. unlike many online publications, we don’t have a paywall or run banner advertising, because we want to keep our journalism open, without have an impact on or the should chase site visitors.

The journalism, reporting and commentary on SiliconANGLE — along with are living, unscripted video from our Silicon Valley studio and globe-trotting video teams at theCUBE — take a lot of challenging work, time and funds. preserving the fine high requires the support of sponsors who're aligned with our imaginative and prescient of ad-free journalism content material.

in case you just like the reporting, video interviews and different advert-free content material right here, please take a moment to try a pattern of the video content supported by means of our sponsors, tweet your aid, and retain coming returned to SiliconANGLE.


Utelogy supplies Cisco contact 10 Integration at ISE 2019 | killexams.com Real Questions and Pass4sure dumps

Utelogy Corporation

los angeles, Calif., Feb 06, 2019 (SEND2PRESS NEWSWIRE) -- Utelogy, maker of commercial enterprise utility for managing, monitoring and controlling linked workspaces, expands its value additional into the commercial enterprise when clients mix a Cisco contact 10 panel with Utelogy's U-control.

the important thing benefits to Utelogy's Cisco contact 10 integration include:* potential to deliver complete AV device manage from the Cisco contact 10 panel* convey a seamless AV journey* combine further room expertise for one-button beginning-up* accumulate Cisco touch 10 administration, monitoring and analytics information from Utelogy's U-control.

With this integration, the contact 10 panel gives a friendly interface to handle the Cisco video convention journey. the usage of Utelogy, extra widgets can be introduced to the custom-made contact 10 interface so as to add new devices. Utelogy then connects to the Cisco equipment to respond and provide comments when the person interacts with these widgets.

"With the combination of Cisco touch 10 and Utelogy, enterprises can now present a higher person adventure, and install and preserve their convention rooms at scale devoid of expensive proprietary programming every and every time a metamorphosis is needed," defined Utelogy COO, William Tinnel.

Utelogy's Cisco contact 10 integration might be unveiled today, at integrated methods Europe 2019 (ISE) in Amsterdam. Drop by Stand 14-M170 to see this and different new functionality from Utelogy.

About Utelogy agency:

Utelogy supplier publishes an business-grade software platform for managing and controlling related workspaces. This hardware-agnostic platform revolutionizes productivity for conclusion-clients and allows for superior services for integrators and other service suppliers.

For extra information, seek advice from https://www.utelogy.com/.

information source: Utelogy agency

linked link: https://www.utelogy.com/

This press unlock became issued on behalf of the information source, who is entirely liable for its accuracy, by means of Send2Press Newswire. To view the usual story, discuss with: https://www.send2press.com/wire/utelogy-delivers-cisco-touch-10-integration-at-ise-2019/


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Remote Phy, Why CIN Architectures Matter | killexams.com real questions and Pass4sure dumps

Written by Gitesh Shah, Technical Marketing Engineer Cable Access Business Unit

We have discussed the benefits of a Distributed Access Architecture (DAA) with Fiber-Deep topology using R-PHY standard in a previous blog (DAA for Cable Access, separating myths from reality). Today I wanted to talk about deploying that architecture, specifically how to design a flexible, resilient, extensible and easy to manage network to interconnect the CCAP-Core and R-PHY Node Devices (RPDs) in the field. Also called the Converged Interconnect Network (CIN).

Cable operators already have previous experiences with the CIN with M-CMTS implementation. In these deployments, external E-QAMs were deployed to allow for downstream convergence in the hub/headend. The M-CMTS CIN would be composed of a few top of rack (ToR) Layer-2 switches to provide connectivity between the M-CMTS and the co-located E-QAM(s). In comparison, a fiber-deep R-PHY environment CCAP core needs end-to-end Ethernet connectivity with RPDs in the field. This poses additional challenges, I will highlight some of them:

  • Multiple and de-centralized cores: The R-PHY spec defines Primary and Auxiliary CCAP Cores as devices that use MHAv2 to interconnect to an RPD. Each RPD will likely need to connect to many cores, either centrally located on a single CCAP device or spanning multiple devices. Providing this connectivity poses a fundamental networking question, should bridging or routing be used?
  • Bandwidth Planning: The R-PHY CIN requires a nonblocking network architecture. Hence the aggregation points within the CIN, where potential bottlenecks reside, have to be provisioned with maximum bandwidth usage in mind. At the point in the CIN where CCAP core devices are aggregated the requirement is to provision for the CCAP core capacity. For example, the cBR-8 Digital Physical Interface Card (DPIC) with 4+4 10G connectivity should be provisioned with 40G per LC. However, on the RPD interconnect switches the aggregation links should be designed with the total number of service groups served and the maximum per service group bandwidth per switch.
  • Full-Mesh or Point-to-Point: A full mesh design ensures physical connectivity to and from all CCAP-Core devices and their respective ports to all RPDs. If such flexibility isn’t required or desired, partial mesh or point-to-point scenarios provide a mechanism to achieve desired connectivity. However, the operational complexities of future migration of cores and re-mapping of RPDs increase significantly with a partial-mesh or point-to-point design.
  • 1588/PTP Requirements: R-PHY architecture requires CCAP-Cores and RPDs to connect to a common 1588 clock. The CIN network needs to provide, symmetric and predictable latency while minimizing the overall end-to-end latency.
  • Redundancy: The CIN can incorporate fiber redundancy, RPD + CCAP core link redundancy and switch redundancy, any combination aforementioned options are in addition to CCAP core High Availability features that protects against software and hardware failures on those devices.  The benefits of each additional layer of redundancy need to be weighed against the complexity and costs.
  • To summarize, we need to design an L2/L3/L2+L3 CIN with a non-blocking architecture, low and predictable latency, and with some level of mesh and redundant connectivity. We can look to modern data-center designs where these precise requirements are met using Clos network-based spine-and-leaf architecture.

    The particular use-case for the spine-leaf architecture for the R-PHY CIN is to optimize east-west traffic. Since the CCAP cores predominately communicate with RPDs and vice-versa, both of these elements are part of a common spine-leaf construct. There will be a minimal amount of control plane and management traffic that will be north-south bound, but the amount will be trivial in nature in most deployments. This unique characteristic provides a way to optimize spine-leaf topology to be suited for the R-PHY CIN. Example Topology:

    A well-designed CIN will pave the way for seamless deployments of RPDs in the production at scale. Additionally, it will reduce operational complexities associated with operating the R-PHY eco-system along with paving the way for future growth and migration to virtualization technologies.

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    Canadian 24-Hour Movement Guidelines for the Early Years (0–4 years): An Integration of Physical Activity, Sedentary Behaviour, and Sleep | killexams.com real questions and Pass4sure dumps

    Benefits vs harms (justification)

    Physical Activity: Based on the systematic review by Carson et al. [18], higher physical activity among children of the early years was favourably related to adiposity, motor development, psychosocial health, cognitive development, and fitness. Although no evidence pointed specifically to harm resulting from increasing physical activity, there was no clear effect observed on bone and skeletal health, cardio-metabolic health, and injuries to rule out the possibility of harm. Nevertheless, in the judgment of the GDP, the benefits of increasing physical activity in children of the early years are likely to outweigh the potential harms, which are likely to be limited to injuries and are unlikely to be serious.

    In balancing the benefits against the harms, in the judgment of the GDP, the desirable indicators (moderate benefits) are likely to outweigh the undesirable indicators (very minor harms); therefore, a recommendation in favour of increasing physical activity is warranted. The GDP placed more value on “moderate” quality evidence showing improvements on adiposity and psychosocial health and on “high” quality evidence showing a benefit in motor development, and less value on “very low” quality evidence showing contradicting findings related to the effect of physical activity on cardio-metabolic health, and on “very low” quality evidence showing that physical activity resulted in an increase in the number of injuries. The GDP also placed more value on evidence showing that total physical activity (TPA), moderate-intensity (MPA), and MVPA resulted in improved fitness.

    A strong recommendation in favour of increasing physical activity is supported by the assessment of overall “moderate” quality evidence supporting the recommendation, the moderate magnitude of the effect, the low variability in how parents and stakeholders value the recommendation, the anticipated small or negligible costs associated with implementing the recommendation, the large savings to the healthcare system expected over the course of a lifetime, and the stakeholder input suggesting that these recommendations would be feasible and acceptable to stakeholders.

    Sedentary behaviour: According to Poitras et al. [21], limiting sedentary screen-based behaviours was associated with benefits (i.e., psychosocial health and fitness), as was engaging in interactive non screen-based sedentary behaviour with an adult (i.e., storytelling and reading was favourably associated with cognitive development). In terms of evidence of potential harms, there was limited inconclusive “low” and “very low” quality evidence regarding the effects of sedentary behaviour on motor development and injuries. Therefore, the impact of sedentary behaviours on these indicators is uncertain. Nevertheless, in the judgment of the GDP it is highly unlikely that decreasing sedentary time or screen-based behaviours would have an adverse or harmful effect on motor development. The potential harms resulting from limiting sedentary behaviour in children are likely to be minor.

    In considering the balance of the benefits versus the harms, it is the judgment of the GDP that the moderate benefits of limiting/avoiding restrained time, sedentary time, and screen based behaviours outweigh the potential for very minor harms, warranting a recommendation in favour of the sedentary behaviour recommendations. The GDP placed relatively more value on “moderate” quality evidence showing that reducing sedentary time improved adiposity (critical) and psychosocial health (critical), and relatively less value on limited “very low” quality evidence on the impact of sedentary behaviour on motor development (critical) and the lack of evidence about injuries (important).

    The overall quality of evidence supporting the recommendation was deemed to be of “moderate” quality, and the magnitude of the effect is expected to be moderate. Taken together with conclusions drawn from the parent and stakeholder survey, focus groups and interviews (i.e, low variability in how parents and stakeholders value the recommendation, the costs associated with implementing the recommendation are expected to be small or negligible, recommendations would be feasible and acceptable) and the large savings to the healthcare system expected over the course of a lifetime, a strong recommendation is warranted.

    Although the body of evidence indicated that limiting sedentary behaviour is likely to improve health indicators in children in this age group, there was a lack of evidence in relation to the optimal sedentary time in a 24-h day. To address this uncertainty, experts recommended supporting the current Canadian Sedentary Behaviour Guidelines for the Early Years (aged 0 to 4 years) [27] from 2012 with slight modifications to introduce guiding principles as to how sedentary behaviours can fit in the context of a healthy day. The recommended sedentary time in the 2012 recommendations align with the new evidence identified by Poitras et al. [21] and, therefore, were adopted by the GDP.

    Sleep: The systematic review conducted by Chaput et al. [22] showed that longer sleep durations (total sleep in 24 h) was associated with benefits related to emotional regulation, growth, and cognitive development, and reduced sedentary behaviour. With regard to potential harms, there was limited and inconclusive evidence about the impact of sleep on adiposity, motor development, physical activity, injuries and quality of life, and no evidence on cardio-metabolic health. Therefore, the GDP could not be certain of the impact of longer sleep durations on these indicators. However, in the judgment of the GDP, the potential harms resulting from longer sleep durations are likely to be very minor.

    In considering the balance of the benefits versus the harms, it is the judgment of the GDP that the moderate benefits of longer sleep durations are likely to outweigh any potential minor harms, warranting a recommendation in favour of longer sleep durations including napping. The GDP placed more value on “high” quality evidence showing that longer sleep durations improved emotional regulation (critical) and cognitive function (critical), and less value on limited “low” quality and “very low” quality evidence showing that increasing the duration of sleep may impact adiposity or physical activity, and on the lack of evidence examining metabolic health.

    The overall quality of evidence supporting the recommendation was deemed to be of “high” quality and the magnitude of the effect is expected to be moderate; the GDP is very confident that the true effect lies close to the estimate of the effect. Taken together with the conclusions drawn from the parent and stakeholder survey, focus groups and interviews (low variability in how parents and stakeholders value the recommendation, recommendations would be feasible and acceptable, and the anticipated costs associated with implementing the recommendation are expected to be small or negligible), and the large savings to the healthcare system expected over the course of a lifetime, a strong recommendation in favour of longer sleep durations, including napping is warranted.

    Although the body of evidence indicated that longer sleep durations, when compared to shorter sleep durations, were generally favourably associated with health indicators regardless of age, no conclusions could be drawn in terms of optimal durations for infants, toddlers, or preschoolers. Content experts from the GDP pointed to the USA National Sleep Foundation [61] and American Academy of Sleep Medicine [62] guidelines, which recommend that in a 24-h cycle, newborns (0–3 months) sleep 14–17 h, infants (4–11 months) sleep 12–15/16 h, toddlers (1–2 years) sleep 11–14 h, and preschoolers (3–5 years) sleep 10–13 h. This was consistent with the systematic review findings [22], which did not uncover any evidence to warrant deviating from these guidelines. Therefore, the newborn, infant, toddler, and preschooler recommendations were adopted by the GDP.

    Combined movement behaviours: The systematic review conducted by Kuzik et al. indicated that the most ideal combinations of sedentary behaviour and physical activity were favorably associated with motor development and fitness; both favorably and not associated with adiposity; and not associated with growth [23]. Replacing sedentary time with vigorous physical activity was found to be beneficial for fitness. The most ideal combinations of sleep and sedentary behaviour were favorably associated with adiposity. There was no evidence on harms/injuries. Therefore, it is unclear if there would be an impact of combined movement behaviours on this indicator. However, in the judgement of the GDP, the potential harms resulting from increasing physical activity, decreasing sedentary behaviours, and increasing sleep duration are likely to be very minor.

    In considering the balance of the benefits versus the harms shown in the four systematic reviews, it is the judgement of the GDP that the potential benefits associated with the most ideal combinations of movement behaviours are likely to outweigh any potential minor harms, warranting a strong recommendation in favour of engaging in higher physical activity, less time restrained and less sedentary screen time, and longer sleep durations [18, 21–23]. The GDP also considered previously published evidence that indicated improved health benefits, higher physical activity, and lower sedentary time when children of the early years are outdoors [60, 63]. The GDP placed relatively more value on “very low” quality evidence showing that the most ideal combinations of movement behaviours were associated with adiposity (critical) and fitness (critical), and “very low” quality evidence on motor development (critical), and relatively less value on the limited “very low” quality evidence on growth (critical) and the lack of evidence on psychosocial health/emotional regulation (critical), cognitive development (critical), bone and skeletal health (important), cardiometabolic health (important), and injuries/harms (important).

    The overall quality of evidence supporting the recommendation was deemed to be of “very low” quality and the magnitude of the effect is expected to be very low. Taken together with the conclusions drawn from the parent and stakeholder survey, focus groups and interviews (i.e., low variability in how parents and stakeholders value the recommendation, recommendations would be feasible and acceptable, and the anticipated costs associated with implementing the recommendation are expected to be small or negligible), and the large savings to the healthcare system expected over the course of a lifetime, a strong recommendation is warranted.

    The body of evidence showed that replacing sedentary time or light physical activity with energetic play (MVPA) is likely to improve health indicators in children of the early years. However, there was no information available about combinations of all three movement behaviours included in the systematic review that would inform a specific recommendation for the amounts of sedentary time to be traded for light, moderate, and vigorous physical activity, and sleep.


    Preventing Buffer Overflow In Visual C++ Applications | killexams.com real questions and Pass4sure dumps

    Buffer overflows are currently the most common cause of security flaws in applications. Discover the techniques that professionals use to thwart this problem in this article by John Mueller.

    Like this article? We recommend 

    One of the most common security issues today is the buffer overflow. This particular security problem is responsible for more virus infections than perhaps all other sources combined. Just about every application and operating system on the market has buffer overflow flaws that a cracker could exploit. The problem is so prevalent with Microsoft Windows that Microsoft is taking a different approach to the problem with releases of products such as Windows XP Service Pack (SP) 2

    The purpose of this article is to help you understand buffer overflows more clearly and to give you simple techniques you can use to reduce (or hopefully eliminate) this problem in your applications.

    Buffer overflows illustrate the point that you can't know what the user will try to type into your application until you actually watch the user interact with it. These attacks rely on a somewhat strange idea. A cracker provides input to a program that exceeds the length of a buffer. The extra information ends up overwriting memory other than the memory controlled by the buffer. In some cases, the memory actually holds executable information (heap memory overrun). Instead of running the original executable code, the application ends up running the cracker's code. In other cases, the cracker overwrites the stack frame for the application (stack memory overrun).

    The application sends a return call to another location where the cracker's code resides.

    Some crackers actually analyze your code, looking for places to exploit either a heap or stack memory overrun. However, in some cases, an exploit is discovered when a cracker tries typing something into a field to see what will happen. For example, a cracker might try to type a simple script to see if your application will execute it. No matter how the cracker discovers the exploit, the result is the same. Your application loses control to the cracker's code—the cracker now enjoys any privileges once enjoyed by your application.

    Many developers think that crackers hatch devious plots to make use of the exploits they create, but many exploits are simple—the simple act of telling the operating system to display a command prompt is enough to gain control in some cases. If the system security is even a little lax, the cracker could gain control of the server. At the very least, a command prompt allows the cracker to probe the system looking for other ways to gain more access. Crackers don't have to gain control of your system on the first try. A little gain here and a little gain there is all they need.

    It doesn't take much to understand that you must provide some kind of protection for your application to keep it safe from buffer overruns. The best way to control buffer overrun is to check every input your program receives, even from trusted sources. This article considers four basic checks that every program should perform: checking the data range, verifying the data length, excluding illegal characters, and providing the user with adequate help to ensure good input.

    The problem of buffer overruns is so entrenched that you really can't trust any source of information—not even your own code—because some operating system layer could contaminate the data. If you want to write truly secure code, you need to make constant checks. Although this may sound paranoid, a little paranoia is good when working with security.

    Validating Data Ranges

    Most data ranges provided by programming languages reflect the realities of the underlying hardware, not the requirements of the real world. For example, when you define a value in your code as Int32, it means that the user can enter any value from -2,147,483,648 through 2,147,483,647. This number is based on the requirements of the hardware where the computer stores the number using 31 bits for data and 1 bit as the sign bit (2^31 = 2,147,483,648). However, your application might not find this range acceptable.

    When the needs of the hardware don't match the real world needs of your application, you must include special code in your application to check for potential error conditions. You might want to accept numbers from 1 to 40,000 in your code, which is outside the Int16 value range, but well within the Int32 value range. Listing 1 shows an example of such a check for an input control.

    Listing 1 Detecting range errors System::Void btnDataRange_Click(System::Object * sender, System::EventArgs * e) { Int32 TestData; // Holds the input value. try { // Always attempt to parse the data first. TestData = Int32::Parse(txtInput1->Text); } catch (System::OverflowException *OE) { // React to the overflow error. MessageBox::Show(S"Type a value between 1 and 40,000.", S"Input Error", MessageBoxButtons::OK, MessageBoxIcon::Error); return; } catch (System::FormatException *FE) { // React to the overflow error. MessageBox::Show(S"Type the number without extra charaters.", S"Input Error", MessageBoxButtons::OK, MessageBoxIcon::Error); return; } // Test the specific data range. if (TestData < 1 || TestData > 40000) // React to the data range error. MessageBox::Show(S"Type a value between 1 and 40,000.", S"Input Error", MessageBoxButtons::OK, MessageBoxIcon::Error); }

    Notice that the code converts the input to an Int32 first by using the Parse() method. This simple conversion locates many input problems. In this case, the code checks for values that are either too large or too small using the System::OverflowException exception and values that aren't in the right format using the System::FormatException exception. After the code ensures that the input value is actually a legitimate Int32 value, it then checks for the actual input range.

    Value data types are the easiest to check because they have specific ranges. Unlike an object, values have no hidden elements and few surprises for the developer.

    NOTE

    Microsoft provides a complete list of value types supported by the .NET Framework.

    In general, all you need to do to validate a value data range is define the upper and lower boundaries, then check for them in your code.

    The problems with data range validation begin with objects. For example, you might require that the user provide one of several strings as input. (Contrary to what some developers believe, strings are objects.) Using list boxes to reduce user choices to the options that you have in mind does help. A user can't enter invalid information, such as a script, when faced with a list box that allows a fixed number of choices.

    Sometimes you have to devise unique solutions for problems. For example, what if you need to ensure that a particular method receives a fixed number of inputs in a discontinuous range? An enumeration can save the day in this case. Listing 2 shows how you can use an enumeration as an automatic range change in your code.

    Listing 2 Using enumerations to check data ranges System::Void btnTestEnum_Click(System::Object * sender, System::EventArgs * e) { // Call the DisplayString function. DisplayString(SomeStrings::One); } // Create the enumerated values. __value enum SomeStrings { One, Two, Three, Four }; System::Void DisplayString(SomeStrings Input) { // Convert the input value to a string. String* DataStr = Enum::GetName(__typeof(SomeStrings), __box(Input)); // Display the input value. MessageBox::Show(DataStr); }

    Notice that the declaration of DisplayString() requires the input of a SomeStrings enumeration type. The caller can't use any other type as input, which means the DisplayString() method is automatically protected from many forms of bad input. For example, you couldn't supply a script as input because it isn't the correct type.

    After the DisplayString() method receives the correct input type, it converts it to a string using the Enum::GetName() method. Notice that you must __box() Input because Input is a value type, not an object type. The code simply displays the resulting DataStr object.

    Verifying Data Length

    Some data types don't lend themselves to quick checks. For example, a string can contain any number of characters, at least up to the limit set by the .NET Framework and the machine. Of course, very few people really need a string that long. Normally, a developer needs a string with a minimum and maximum length range. Consequently, you not only need to verify that you've received a string, but that the string is the right length. Otherwise, someone could send a string of any length, and that could lead to a buffer overrun. Listing 3 shows how you can prevent this problem by validating the data length of each argument.

    Listing 3 Verifying the data length System::Boolean ProcessData(String *Input, Int32 UpperLimit, Int32 LowerLimit) { StringBuilder *ErrorMsg; // Error message. // Check for an input error. if (UpperLimit < LowerLimit) { // Create the error message. ErrorMsg = new StringBuilder(); ErrorMsg->Append(S"The UpperLimit input must be greater than "); ErrorMsg->Append(S"the LowerLimit number."); // Define a new error. System::ArgumentException *AE; AE = new ArgumentException(ErrorMsg->ToString(), S"UpperLimit"); // Throw the error. throw(AE); } // Check for a data length error condition. if (Input->Length < LowerLimit || Input->Length > UpperLimit) { // Create the error message. ErrorMsg = new StringBuilder(); ErrorMsg->Append(S"String is the wrong length. Use a string "); ErrorMsg->Append(S"between 4 and 8 characters long."); // Define a new error. System::Security::SecurityException *SE; SE = new SecurityException(ErrorMsg->ToString()); // Throw the error. throw(SE); } // If the data is correct, return true. return true; } System::Void btnDataLength_Click(System::Object * sender, System::EventArgs * e) { try { // Process the input text. if (ProcessData(txtInput2->Text, 8, 4)) // Display a result message for correct input. MessageBox::Show(txtInput2->Text, "Input String", MessageBoxButtons::OK, MessageBoxIcon::Information); } catch (System::Security::SecurityException *SE) { // Display an error message for incorrect input. MessageBox::Show(SE->Message, "Input Error", MessageBoxButtons::OK, MessageBoxIcon::Error); } catch (System::ArgumentException *AE) { // Display an error message for incorrect input. MessageBox::Show(AE->Message, "Argument Error", MessageBoxButtons::OK, MessageBoxIcon::Error); } }

    The validation occurs in the ProcessData() method, which accepts the input string, the minimum string length, and the maximum string length as inputs. Notice that the code first verifies that the input arguments are correct. The UpperLimit argument must be larger than the LowerLimit argument. This portion of the code demonstrates a good practice for all developers—never trust the input you receive. Notice that the code raises a System::ArgumentException exception, not a generic exception. Too many developers use a generic exception when a specific exception will work better. When the .NET Framework fails to provide a specific exception for your coding need, it's time to create a custom exception that does.

    The code validates the string next. If the string doesn't have enough characters or if it has too many, the code raises a System::Security::SecurityException exception. The security exception is correct in this case because of the events that lead to the exception. A user might decide to input a long string in order to create a buffer overflow condition. Even when the user has made a mistake, the fact that you raise this event as a security exception means that you can at least verify the reason for the exception, rather than simply pass it off as a user having a bad day.

    The test code for this example appears in the btnDataLength_Click() method. The code executes within a try...catch block to ensure that the exceptions are trapped. The actual check is a simple if statement. The code includes one catch statement for each exception. Trapping the exceptions is important if you want to ensure that the application notes any security exceptions and handles them appropriately.

    Excluding Illegal Characters

    Crackers often include extra illegal characters in their input to see what happens. For example, a cracker can often create a script by adding special characters. In many cases, the system will execute the script without any warning, giving the cracker access to the system. Web applications are more susceptible than desktop applications to this exploit, but you need to protect both.

    NOTE

    See an interesting description of one of the more interesting Web application exploits at this Web site.

    Fortunately, the .NET Framework provides great regular expression support. A regular expression defines the acceptable input for a string, so you can detect illegal characters easily. Listing 4 shows one method for using regular expressions.

    Listing 4 Using regular expressions System::Boolean CheckChars(System::String *Input) { StringBuilder *ErrorMsg; // Error message. Regex *R; // Regular expression. // Create a regular expression for match purposes. R = new Regex("[A-Za-z]"); // Check for a data length error condition. if (R->Matches(Input)->Count < Input->Length) { // Create the error message. ErrorMsg = new StringBuilder(); ErrorMsg->Append(S"String contains incorrect characters. "); ErrorMsg->Append(S"Use only A through Z and a through z."); // Define the exception. System::Security::SecurityException *SE; SE = new SecurityException(ErrorMsg->ToString()); // Throw the exception. throw(SE); } // If the data is correct, return true. return true; }

    The code begins by building a Regex object. In this case, the only acceptable inputs are letters (you can't even include spaces). Regular expressions can encompass a vast array of inputs. In fact, there are many default templates provided as part of the validator support for ASP.NET applications. The point is that you can build a string that defines acceptable input, including input patterns such as telephone numbers.

    A Regex object can perform a number of comparisons. It uses the Matches() method in this case to check the length of the string against the number of comparisons. When the two numbers match, the input is correct. Otherwise, the input contains illegal characters, and the CheckChars() method raises an exception.

    Providing Superior User Help

    Many developers would never associate help with good security, but good help does improve security by making user mistakes a little less likely. For example, a good help file can prevent many kinds of user input errors by showing the user precisely what your application expects to receive. Reducing input errors makes it possible to perform thorough analyses of the errors that remain, which reduces security risks from incorrect input in the end.

    Help comes in all forms, including useful error messages. Some data types present special challenges that your application must handle to ensure data integrity, as well as address security concerns. For example, a date is a common data entry item that can present problems. First, you need to consider the format of the date. A user could type 1 June 2003, 06/01/2003, June 1, 2003, 2003/06/01, or any other acceptable variant. Restricting your application to allow only one date format makes it easier to check the data for invalid information. The error messages and help files must tell the user what form to use, however, so the user doesn't become frustrated when entering a valid date using an incorrect format.

    No matter what you do, some users will attempt to abuse the system. They'll enter the date using the wrong format or even type something that has nothing to do with a date. However, by providing good help, you now have a basis to question the user. You can invoke security measures that ensure that users know that the behavior is unacceptable. Reducing buffer overflows is a proactive process. You must defend against the invalid input, provide good help to users who aren't informed, and be willing to take punitive measures against those users who decide to ignore the rules.



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    Cisco 650-669 Exam (Cisco SP Video Digital Media Design(R) Specialist for SE) Detailed Information



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