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Exam Number : CCSK
Exam Name : Certificate of Cloud Security Knowledge
Vendor Name : CSA
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EXAM NAME : Certificate of Cloud Security Knowledge
EXAM DURATION : 90 Minutes
QUESTIONS TYPE : Multiple-Choice

As organizations migrate to the cloud, they need information security professionals who are cloud savvy. The CCSK certificate is widely recognized as the standard of expertise for cloud security, and gives you a cohesive and vendor-neutral understanding of how to secure data in the cloud. The CCSK credential is the foundation to prepare you to earn additional cloud credentials.

An in-depth understanding of the full capabilities of cloud computing.
The knowledge to effectively develop a holistic cloud security program relative to globally accepted standards. Best practices for IAM, cloud incident response, application security, data encryption, SecaaS, securing emerging technologies and more. How to assess the security of cloud providers and your own organization using the cloud-specific governance & compliance tool: Cloud Controls Matrix.

Prove your competency in key cloud security issues through an organization that specializes in cloud research.
Increase employment opportunities by filling the skills-gap for cloud-certified professionals.
Demonstrate your technical knowledge, skills, and abilities to effectively use controls tailored to the cloud.
Learn to establish a baseline of security best practices when dealing with a broad array of responsibilities, from cloud governance to configuring technical security controls.
Complement other credentials such as the CCAK, CISA, CISSP and CCSP.

The CCSK is an open-book, online exam, completed in 90 minutes with 60 multiple-choice questions selected randomly from the CCSK question pool. Purchasing the exam costs $395 and provides you with two test attempts, which you will have 2 years to use. The minimum passing score is 80%. There are several ways you can prepare for the exam.

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Video: putting high speed PCB Design To The look at various | CCSK Dumps and braindumps

Designing circuit boards for high velocity applications requires particular considerations. This you already be aware of, however what precisely do you need to do in a different way from commonplace board layout? constructing on where I left off discussing impedance in 2 layer Printed Circuit Board (PCB) designs, i wanted to beginning speakme about high velocity design suggestions as they relate to PCBs.  here's the world of multi-layer PCBs and where the impedance of both the vigor start network (PDN) and the integrity of the signals themselves (signal Integrity or SI) turn into very essential components.

I put together a number of board designs to look at various out distinct cases that have an effect on excessive pace signals. You’ve possible heard of vias and traces laid out at right angles having an influence. but have you regarded how the glass material weave in the board itself affects a design? during this video I grabbed a few of my fanciest examine equipment and put these design assumptions to the test. Have a look and then be part of me after the smash for greater details on what went into this!

What I mean via “high pace”

The time period “excessive pace design” can mean different things to distinctive people counting on what they're used to working with, but for me it’s the place the power of the rising and falling edges of the indicators dominate the conduct in comparison to the primary frequency of the sign itself. In different words a 10Mhz signal that has a 1ns upward push time has a bandwidth of roughly 350Mhz as seen by the components under.  finally it’s the power within the upward push/fall time of the signal that affects a lot of the design.

the relationship between the bandwidth and the rise time may also be approximated as:

with regard to high pace design rules, my first rule of thumb is to be cautious about guidelines of thumb. i use rules of thumb as an early estimate that helps me to get an idea of how all of my design guidelines and dreams play together.

As somebody who has been doing design considering that the 1970’s I even have considered the evolution of assumptions and design guidelines mature and it’s fair to claim that there were a couple of things that they acquired incorrect along the way, some things almost comically incorrect. for instance, I even have heard individuals say that electrons slam into each and every different making an attempt to show corners at high speeds so it’s a foul component to do, they now don’t consider that manner.

excessive velocity Design Assumptions

one of the vital concepts of high speed design are listed under.  i will’t get to all of them in this one post however I do are looking to get to all of them in flip.

  • At excessive speeds it’s all about the propagation of the Electro-Magnetic (EM) field, no longer electrons.
  • high speed latest follows the route of least impedance on a power or floor aircraft, no longer the route of least resistance.
  • due to the geometry of the glass material weave used within the construction of the PCB, the impedance of a signal trace may exchange based mostly upon the orientation and the position in relation to the weave.
  • correct perspective corners in PCB traces may not be close as hazardous as frequently assumed.
  • In a properly designed multi-layer PCB, the location of decoupling capacitors near the hundreds may also not be near as crucial as is believed.
  • Ferrite beads in keeping with the a considerable number of voltage traces may additionally do more damage than respectable.
  • Differential pairs aren’t coupled to each and every different like they regularly depict, their return current is in the course of the floor plane, now not in the course of the other half of the pair of traces.
  • Tightly coupling a differential pair may now not have as good of noise rejection as two random paths offered they're the same length.
  • considering the fact that the present flows on the surface of a conductor (referred to as epidermis impact) excessive pace PCB’s may additionally specify easy or polished copper traces for the internal layers in order that the path is smoother and straighter.
  • EM Fields EM container on multi-layer PCB as considered aspect on.

    At high speeds it’s no longer so lots in regards to the circulation of electrons however rather the energy in the Electromagnetic (EM) box and the style these fields propagate.  sure some electron displacement occurs along the style however an easy approach of taking a look at this observation is that each one of this works in a vacuum.

    in case you have been to picture distinct traces within the same dielectric area which you could see that the fields would overlap and because of this have interaction with each different.  this is one of the crucial primary causes of crosstalk. a different way of saying here is that crosstalk occurs in the whitespace between the conductors where the fields overlap and have interaction.

    A characteristic of considering of signals and their EM fields racing around is that the return latest follows as carefully to the outbound signal as possible. final time I talked at length in regards to the fact that the path of minimal inductance is the path that kinds the smallest loop between the outbound and return currents. in consequence this ability that the return current follows the path of least inductance, therefore the path of least impedance (Z). Impedance is the aggregate of resistance(R), inductive reactance (XL) and capacitive reactance (XC) all measured in Ohms (Ω)

    impedance path multilayer impedance

    The picture on the left above indicates the return latest density follows the signal on a single layer. In true life, alerts frequently bounce layers and with the intention to have the return existing continue to comply with the signal carefully (and for this reason manage the impedance) they have to area VIAs neighborhood that join the internal reference (floor or vigour) planes. here's proven on the correct.

    Impedance checking out

    To proceed testing some of my design guidelines listed in the beginning I constructed a PCB to check the impedance of diverse PCB traces.

    pcb-2d pcb-3d pcb-colot

    PCBs are developed of layers of conductors (usually  copper) and dielectrics (customarily epoxy covered glass fibers). As speeds go up these substances turn into further and further really expert. when you consider that the glass fibers or weave are uneven, they can have an effect primarily based upon how the conductors interact with the weave of the fibers as proven under.

    comfortably put, traces that align directly with the row of the glass fibers may have a special impedance than the trace that experiences alternating bundles of fibers.

    Likewise a trace within the vertical course will see a unique volume of glass below it than a horizontal trace because of the transformations of the weave density in different instructions. One answer is to unfold the fibers out right through PCB fabrication, but as you might are expecting, the price of the achieved PCB begins going up.

    one way to look at various the impedance of a PCB trace and to look alterations alongside the route, is a excessive velocity Time area Reflectometer (TDR).  TDR’s are known at slower speeds as in cable trying out, [W2AEW] has a extremely informative video on the complete idea in the back of it.

    high speed Time domain Reflectometer

    behind the expertise is a fast rise time pulse. I had really began to write this publish as guidelines on how to make a quick upward thrust time generator the usage of quite a lot of concepts after practicing Jenny listing’s article on pulse edges.  all through my analysis I purchased a pulse generator that clocked in at 32 picosecond (ps) upward thrust time (bought as 40ps or sooner) designed by an engineer named Leo Bodnar.  once I received my pulse generator I saw that Leo had used a venerable piece of gadget frequent because the Tek CSA803/SD24 Communications sign Analyzer (CSA) which has a 20Ghz bandwidth and a 17.5 ps upward thrust time pulse to symbolize my module. I just had to have one of these CSA’s myself and observing eBay received me a very good locate, notwithstanding I haven’t advised my wife yet. With this new-to-me piece of equipment I spark off to verify how effectively I may see the outcomes of the glass fiber route on impedance.

    Horizontal vs. Vertical PCB Traces

    As will also be considered below there's a definite change in the baseline impedance based mostly upon the course of the PCB trace.  See the video for all of the enjoyable in establishing for these pictures.

    that you may see a particular and measurable difference within the impedance of the traces based mostly upon the orientation of the trace on the board, in the case of this board the Vertical hint changed into off with the aid of about five p.c.

    There are a few recommendations that help cope with this effect devoid of the cost of going to a extra expensive PCB with a tighter glass weave. My CAD software helps the two leading concepts proven below to support automate the technique but both will also be achieved manually as well.  the first method entails zig-zagging in a now not-so-orthogonal means with a view to statistically cut back the results. If there is the alternative of laying out the PCB in a larger panel then it may also be cocked to at least one facet (I actually have heard 10-11 degrees but it surely is plagued by other variables as smartly) in order that again the sum of indicators working down the worst case paths is minimal

    Two concepts for reducing the effect of PCB glass weave have an impact on on traces. surprising Discovery: rectangular Corners probably Don’t count

    probably the most factoids that plague the business is the issue about what the effect of appropriate perspective corners used on PCB traces could have on the impedance of these traces. other complaints are that the RFI emissions are greater with correct angles and that acid can build up within the corners right through the fabrication. i will put this board  on the spectrum analyzer and check for “EMI spray” in the next video put up and in case your PCB fab house complains about acid in the corners then i might humbly suggest that one locate a different fabricator.

    Right Angles have Minimal Impact on ImpedanceTraces with right Angled Corners Have Minimal have an effect on at reasonably excessive Speeds

    I set out to see if I might realize the results of corners myself with my new 20Ghz capability. As considered above the consequences of appropriate angle corners at 20Gz (.35/17.5ps=20Ghz) with a trace width of 5.27mil (calculated for 50Ω Impedance) on the characteristic impedance are minimal.

    rectangular Corners mean more Capacitance, however now not tons

    at the coronary heart of the controversy over rectangular corners vs. angled corners is the moderate change in capacitance as a result of the alternate in trace width represented with the aid of a square nook.

    We be aware of the capacitance of the area of the metal considering we're speaking about 50Ω impedance in regularly occurring. Per the equations above a 6mil hint would have an further capacitance of 9.6fF (femtofarad), or 0.0000000096 μF, here is really small. The different factor that minimizes the impact of the corner is simply how fast it goes by on the velocities they are talking about, which might be large fractions of the pace of easy. on account that a signal travels 6 inches in 1ns on a common FR4 PCB, the sign will get in the course of the corner in 30ps.  (Which is why I must use device with a 17.5ps rise time to verify it)

    extra about this may also be viewed in Eric Bogatin’s post on EDN the place he comes up with a pleasant rule of thumb:

  • in case your upward thrust time is 10ps, don’t be concerned about corners unless your 50O line widths are wider than 50mils.
  • If panic about corners for your design, confirm what your bandwidth is (35Ghz for 10ps upward thrust time) and your hint elements, considering the fact that 50mils is in reality huge for a signal trace, it is more like a power hint in most designs.

    only for the Heck of It.

    just for the heck of it I ran the equal verify simplest in its place of corners I had “putting VIAs” which admittedly are worse case as they are like little capacitors and antennas putting off the hint.  i needed to be sure to have something that would show up for instance of worse case when in comparison to correct angle corners and this instance didn't disappoint.

    impact of VIAs on trace Impedance Conclusion

    The aspect I definitely desired to get throughout is to be cautious when for the reason that rules of thumb category assistance. question the sources of information, and do not be afraid to measure for yourself what that you could if you happen to can if doubtful. in particular else ask the question, “How did you know?”.

    As these consequences were all proven within the “time domain”, I can be demonstrating one of the elements of the “frequency domain” as it pertains to excessive speed design within the next installment.

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