بررسی تئوری های سیسکو در طراحی شبکه ( CISCO Validated Design )

ازین پس در نظر داریم طی یک دوره اصول طراحی شبکه های بزرگ را بررسی کنیم . از نکات مغفول در غالب پروژه های شبکه  میتوان به عدم تسلط طراحان و مجریان پروژه به تئوری های معتبر طراحی اصولی یاد کرد ...

بعد از سال 2009 و با توسعه بسیار سریع شبکه های مبتنی بر TCP/IP  شرکت سیسکو در فرایند تحقیق و توسعه قالب های جدید طراحی شبکه را ارائه کرد . این قالب ها بر اساس فیدبک های دریافتی از شبکه های مشتریان بزرگ سیسکو در سراسر دنیا بود . قبلا قالب اصلی طراحی سیسکو بر معماری سه لایه ای یا همان سلسله مراتبی بنا شده بود . پس از آن سیسکو با ارائه Enterprise Model Design  و تکامل آن به سبک های جدید در طراحی و توسعه شبکه های بزرگ اعم از Service Provider , Enterprise , DataCenter  و ... گام های بلندی در فرایند توسعه و بهینه کردن وضعیت شبکه های اینترنتی برداشته است . به نظر نگارنده سیسکو در نگرش خود  اساس کار را ترکیبی از مدل های طراحی درختی ، سلسله مراتبی و ماژولار  قرار میدهد . نباید فراموش کرد که فن آوری های شبکه به سرعت در حال کسترش و پیشرفت میباشد و هر روز و هرسال با ارائه روش های نو امکانات بیشتری برای ارائه سرویس روی تجهیزات بسیار قویتری قابل اجراست . در حال حاضر برای هر یک از نقاط شبکه های بزرگ متد های طراحی خاصی در حال ارائه است . به عنوان مثال در یک شبکه بسیار بزرگ طراحی هر کدام از اجزای آن تابع اصول خاصی است و این به دلیل گستردگی بسیار زیاد سرویس ها و تجهیزات آن است . بنابراین در یک شبکه بزرگ  هر کدام از بخش های شبکه مرکزی ، لبه شبکه ، دیتا سنتر ، سرویس های فیزیکی و مجازی و ...   ملاحظات و مخاطرات خاص خود را برای طراحی دارند . به واقع نتیجه کار تیم طراحی در روند نگهداری و پشتیبانی دیده خواهد شد . طوریکه اگر در طراحی ایراد ها و خطاهای زیادی وجود داشته باشد بهترین تیم های پشتیبانی و نگهداری هم نمیتوانند از پس وظایف خود بر آیند . و این یعنی در آینده به کسانی احتیاج است که با نحوه معماری و  طراحی شبکه های بسیار یزرگ آشنایی کامل نظری و عملی داشته باشند . همان معماران نسل جدید شبکه های اینترنتی !

به دنیای طراحی IPSpace خوش آمدید ...

95 درصد دارندگان مدارک سیسکو از دامپینگ استفاده کرده اند !

متن زیر نوشته یکی از نخبگان دنیای شبکه و رکورد داران تعداد مدرک CCIE  است . نکات جالبی در متن وجود دارد به خصوص در بخش آخر که اظهار میدارد 95 درصد دارندگان CCIE اقدام به خرید سئوال قبل از امتحان نموده اند

  ....  

Hello everyone

As I am not even close to a native language speaker, so apologies to my English in advance

I receive many questions from people asking me, what's my secret of passing all these exams and give them some advice

Well, of course there's a lot of efforts and time spent but there's also much more then just that

Earlier this year, I met a great guy (Ramses Smeyers) at one of Cisco JTA events who said that it's OK if you have one or two CCIEs, but if you have more, there's gotta be something wrong with you

And he's right, there's something wrong with me and other multiCCIE people out there

It can be addiction, competition, just lots of free time, or something else

In any case it makes these people unusual and attracts attention to those who have just started their journey to CCIE/JNCIE/RHCE or any other valuable certification on the market. Some newbies are thinking that it's something unbelievable and only the chosen ones can make it. But I can tell you it is NOT true as everybody can do this. Especially everybody can be trained to pass all these exams. All you need is some patience, willing to pass and sometime a proper guidance

Let me unveil the secret that is bugging many candidates. Let's call it secret sauce which is made of several ingredients

Ingredient #1 - Time management

I would say that is first and the most important one. You can learn patience, sleep less, earn all the money, but it's always 24 hour in a day no matter what

Work is time consuming, sleep is time consuming, family and friends, if any, are time consuming, hobbies is time consuming, essential and natural needs, well, everything needs some time to spend

So that's really important to optimize your schedule in order to make your preparation more efficient

Ingredient #2- Patience

I know it might sound stupid but I think that patience is next top most important skill that every candidate have to possess in order to successfully pass the exam. Panicking never helps. When you are calm, you can think positive, rationally and make less mistakes

GO and find your Zen and you will never regret having it

Ingredient #3 - Power of two

Do not underestimate power of group studies! That's a very powerful tool! It saves not only your time, but money as well. I remember that group studies helped me tremendously when I was preparing for my CCIE/CCDE exams. It's hard to find proper people as many of them passively waiting for something and don't want to make any effort, others are out of your schedule,  the rest of them are not serious about it

So my advice, spend some time and find at least 2-3 proper study buddies who you feel certain about and are comfortable with

The last and most important ingredient - Awareness

When I say awareness, I mean be ready for what exactly you will face on your exam. Be aware of diagrams, questions, tricks and pitfalls

How? Well, let's be honest, nobody wants to take their exam more than once as each and every attempt takes your time and money which you could spend much more effective, right? Each and every fail is killing your desire to go for it and you just want to give up, get drunk and just move on. So we'd better be ready for it

I know, there's NDA and everything, but Cisco, Juniper and all other vendors are well aware of dumpers. Yes, there're well aware of those who just cram and pass their exams so they develop new strategies, create new content, implement anti-dump techniques and make it much harder to pass

Though they want to make their exams to be equal for everybody, it's not possible as many candidates are way ahead of the others because they have dumps (lab questions, lab diagram, initial configs, injected faults, etc.) and others do not

Those who don't have dumps need to attend exam 2-3-4 times in order to build their own stuff. Or they can just buy it from other sources (You can always google for it if you are interested). So unfortunately, even true candidates who have all the required skills and experience in order to pass lab are end up buying dumps...

e.g. We can not get an official statistics on that, but based on my experience, 95% of current blueprint CCIEs passed their exam using dumps. How do you like it

We can talk forever about it, so back to the main point. Be aware of the exam content - and that's up to you which way to go

Post Scriptum

I did not mention anything about lab equipment or trainings intentionally

Post Post Scriptum

If you liked it or want me to elaborate on some particular topic, just leave a comment

Denis Zuev  2xJNCIE/6xCCIE/CCDE