Orhan Ergun No Comments

Four of my students passed the CCDE Practical exam in August 2016

Hi everyone,

I am glad to announce that below 4 of my students passed the CCDE Practical exam in August 2016 after attending my CCDE Training Program and got their CCDE numbers yesterday.

You will have their success story and CCDE exam preparation recommendations on www.orhanergun.net  in couple days. They are still celebrating it 🙂

November 17 is the only CCDE Practical exam date left this year. Join my November 10 days CCDE Training Program.

You can still have your 2016 CCDE number ! Learn More..

Hashiru Aminu No Comments

Hashiru Aminu CCDE Exam Success Story and Recommendations

I took the coveted CCDE  Practical Exams on 31st of August, and Thankfully I passed (My CCDE Number is 2016::14), this is my third attempt, the journey started in 2011, Gone through a lot of studies, Boot camps, Ciscolive Sessions, CCDE Mock Lab in Ciscolive, Mentorship from existing CCDEs.

My First attempt was in 2014 that ended with an average score, the second attempt was in February, 2015. The second attempt made me change a lot of my strategies as this beast requires a totally different approach and preparation than CCIE.


My Advice to the CCDE Candidates:

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Orhan Ergun 5 Comments

Great Cisco CCDE Achievement

Cisco CCDE Achievement 

Congratulations, Martin J Duggan, for being among one of the three people who passed the May 2016 CCDE Practical Exam. Your hard work has truly paid off not only because you attended my class, but, also because you put in your efforts to make this dream of yours a reality.

You have made us proud. Well done!


Martin J Duggan

Martin J Duggan

Network Architect at AT&T, Ciscopress Author, CCIE#7942

What Martin says about Orhan Ergun CCDE class

I attended Orhan’s April 2016 10 days CCDE Bootcamp.

You can tell Orhan has a great deal of experience, it really comes through when he presents his design case studies and the CCDE Practical scenarios– if you are approaching the end of your CCDE journey this is a good place to stop by and put it all together.

Thanks Orhan for everything.

 Other Cisco CCDE Success Stories and the Testimonials of Orhan Ergun’s students


Orhan Ergun No Comments

CCDE Practical Lab Scenarios Bootcamp

Hi Everyone

I would like to inform all my readers that I have commenced the CCDE Practical Lab Exam Scenarios Bootcamp.

In the CCDE Practical Lab Scenarios Bootcamp, I will share the CCDE Practical Lab scenarios. Four Lab Scenarios will be covered.Of course, these scenarios depict some of the questions in the current CCDE practical exams. They will help you to understand the exam structure, to approach the questions and to pass the exam.

The difference from the regular CCDE Practical Bootcamp (not scenarios specific) is Read more

Orhan Ergun No Comments

orhanergun.net New Design – New Price !

This is a great news everyone !

Now you will enjoy your CCDE preparation much more than before: orhanergun.net has a new fancy design and a new membership price for the most special network design content!

You won’t believe but it’s ONLY $349 per year!

Besides, it means that the investment in your career is less than $30 a month.

Even if you’re not targeting to pass CCDE in the near future, the new price enables you to use DesignWorld materials to learn more about network design.

We wanted to make your studies affordable, so this is your true chance to become a CCDE candidate!


Check sample comparison charts to see the benefits of them

Click here to watch the sample videos of the CCDE course to understand the format

Check the CCDE Course Content

Orhan Ergun 1 Comment

CCDE Preparation Tips and Tricks by Yoshinori Okayama – World’s first 8xCCIE & CCDE

Yoshinori Okayama

Disclaimer : This is a Guest Post, prepared by Yoshinori Okayama, 8xCCIE & CCDE for www.orhanergun.net which is the most visited and well known network design website in the world.

First of all, please allow me to introduce myself. My name is Yoshinori Okayama. As a CEO, I’m managing my own company called Root Riff Systems, Inc. in Japan and holding 8xCCIE/CCDE.

I started my career as just a PC support engineer for consumer users, but I got bored with this. To enter IT infrastructure world, I passed MCSE 2000 and CCNA certification about 13 years ago as a server engineer.

But I got bored and tired with the server world with AD, Exchange, Linux/Unix, scripting, SAN, too much unnecessary logs and so on, jumped into the networking world and ever since I keep doing this.

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Orhan Ergun No Comments

April 2016 CCDE Bootcamp

CCDE Bootcamp – This is an Online Cisco CCDE exam preparation training.

Probably you all know the success of Orhan Ergun’s CCDE Bootcamps and how it has been helping so many engineer become a better network engineer/designer. If you don’t know, please just take a tour on the website. Check the Success Stories, Why Orhan and the Sample Videos.

Let’s continue to our journey with the April 2016 CCDE class.

Please note that, there is a 20% discount for the early registrations. February 15 is the last day.

Come and learn the network design from the best !

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Orhan Ergun 4 Comments

Routing design

Understanding everything about routing design is no brainer, especially if you have the chart below on your wall.

The table below highlights the pros and cons of each routing protocol. Of course, you need to consider the design attributes shown in Figure A before embarking on routing design.

Should you like the comparison of the routing protocols illustrated in the table below or should you want to see similar comparison for other technologies, feel free to add your comment in the comment section.

Another boon for all my readers!

If you are interested in network design or considering CCDE, CCDP, or CCDA certification, you can subscribe for membership here so that you can peruse all the design resources (Videos , Tests , Case Studies , and E-Books).

Figure A: Comparison of Routing Protocols

Orhan Ergun 1 Comment

January 2016 Online CCDE Bootcamp

I have just decided to schedule my next online class for the February 2016 CCDE Practical exam preparation because of three reasons. One is the high level of demand for my early CCDE bootcamps; the other is the overwhelming number of students pursuing the CCDE; the last is the high numbers of students who passed the exam from my class.

Click here for an overview of the students who have passed the latest (October 2015 ) CCDE Practical exam.

This class will not only include an overview of the technology concepts needed to pass the exam but also include several mini and full design scenario that mimic the structure of the CCDE lab exam.

Read more

Orhan Ergun 6 Comments

November CCDE Achievers

I am very proud to announce that Daniel Lardeux, Johnny Britt and Mohammad Haddad passed the CCDE Practical exam yesterday and they joined the CCDE Club, which is one of the most respected IT certifications.

Their CCDE numbers will arrive in a couple of days.

See the existing Global List of the CCDEs, their companies and numbers here. If you are not in the list, have changed your company or want to be on the list, contact me.

Daniel and Mohammad joined my July class and Johnny used the CCDE Practical preparation bundle.

I would like to stress that four guys from my class or using my preparation resources attempted the November 2015 CCDE Practical exam and three of them passed! A 75% success rate is not a small thing for this certification.

They all glad that they have not only learned the CCDE-related topics but also the real life network design.

Read more

Orhan Ergun 5 Comments

Network Design Best Practices – Simplicity

Network Design should be simple! Simplicity is the first network design best practice that I want you to remember. If you have been in the field long enough, you have probably heard about the KISS principle.

If you are a regular follower of my blog, you have maybe heard about the SUCK principle as well.

KISS stands for Keep It Simple Stupid. But do you really know what the simple part is ?  Can every part of the network be a simple ?

Unfortunately NOT ! It just cannot be ! But still you should on simplifying as much of your network as possible.

As I have indicated in the past here, intelligence should be at the edge of the networks and network core should be as simple as possible. If you read the above article, you will see some examples. ( There are different opinions about the place of simplicity in networks. Some researchers believe that if the core has some intelligence the overall network complexity is reduced ).

Networks have many protocols, technologies. Understanding each of them might be easy but interaction between them creates complexity.

In my CCDE training sessions, I like to give the Pepper and Salt example to explain this point.

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Orhan Ergun 2 Comments

Cisco CCDE Practical Self Study Materials

CCDE Practical Self Study Materials are available now !

Update : This materials are more than a year old. New workbook will release by July 15th 2016 as hard copy only. Old materials only cover 30% of the new book. Also videos are not available for download anymore, only can be accessible with subscription. Please click here for subscription. 


Advanced Technologies Workbook

Update : New book has 50+ Case Studies, 20+ Comparison Charts , 10 Design Quizzes and Answers , as well as full length CCDE Practical Scenario.


Old Book : Design advices from a practical standpoint , more than 10 case studies and 1 CCDE practical sample scenario. You will have 1 year free update.

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Orhan Ergun 6 Comments

Russ White – Orhan Ergun CCDE Practical Exam Scenario

I am glad to announce that Russ White and I have been preparing a CCDE Practical Exam ( Lab Exam ) Scenario. This is the most realistic scenario available anywhere. Why? Because it is not only prepared by a CCDE but also by one of the exam founders!

Disclosure : This is not asked in the CCDE exam , but the structure and idea is very similar to what would be found in the exam.

Russ White is one of the CCDE exam founders and the Author of Optimal Routing Design, Practical BGP, Advanced IP Network Design, and many other network design and architecture books. Russ and I have put much effort into preparing this scenario.

I will first present this scenario for the first time in the July CCDE Training class. (You can see from here the topics which I will talk about in the class as well.)

There are already more than 20 people in the class and multiple people will attend the CCDE Exam in August. I am sure this scenario will be an excellent resource for the CCDE candidates.

If you want to be a good network designer as well as a CCDE, it is not enough to understand the technologies alone, but you also need to understand how business intersects with those technologies.

You need to understand how business drives the network, and how the network can drive the business.

How can you analyse the network ? How can you prepare an architecture ? What are the attributes of good design? What are the most important tradeoffs? All of this will be discussed and more!

This is the ONLY CCDE Design class offered online. Travel and time away from home is null thus saving you not only time but money!


Orhan Ergun 4 Comments

CCDE Practical Training Demo Video

I have been delivering CCDE practical training for quite some time. Couple months ago I have started a survey for my CCDE training. 134 people voted and here is the results.

ccde practical class

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Orhan Ergun No Comments

Google CCDE Group Study

Ethan Banks and I have been managing Google CCDE Study Group for more than 2 years. Ethan who is the packetpushers.net founder and friend of mine created this study group to discuss Cisco Certified Design Expert related topics and real life network design with the experts.

Google Study Group has full of CCDE related topics !

I was a group Manager until yesterday. Since Ethan is very busy with his other projects and I am fully focused on CCDE preparation, training and helping the people who are interested in CCDE and network design, He decided to left the group ownership to me.

There are 500 people in the group and 100 topics related with network design, networking technologies,protocols, best practices and the journey of the people who achieved CCDE certification successfully. 

If you are not membership of the Google CCDE Group Study yet, you can apply now.

In order to protect the group from spam , we have been asking a reason for participation and I will continue in the same way. Please indicate your reason, join the group and start to get benefits of all network design and CCDE related topic !

If you are interested in Group Management role, let me know.

Also please be informed that registrations started for my July CCDE Training , check this new registration page.

Orhan Ergun 4 Comments

CCDE Lab – CCDE Practical 2016 Exam Dates

Cisco announced 2016 CCDE Practical exam dates.

CCDE practical exam is organised only in every 3 months. Prerequisite for the exam is CCDE Written Qualification exam.

You can attend the exam 4 times a year in  a Professional Pearson Centers.

I am planning to start my CCDE trainings  2 months before an announced exam date so we can finish it until your exam date.

CCDE 2016 practical exam dates


For more information click here.

When are you going to attend the CCDE exam ?

Orhan Ergun 28 Comments


CCIE vs.CCDE is probably one of the most frequently asked questions by networking experts.

How many times have you asked yourself or discussed this topic with your friends? Many times, right?

I have CCIE routing switching and/or service provider, should I continue to design certificates such as CCDE or should I study for another expert level certification, perhaps virtualization certification?

To illustrate my answer, let me give you an example.

Consider that you would build Greenfield network. (Usually, it is the same for Brownfield as well).

First, you need to understand the business, how many locations it has, where it is located, where is HQ or HQs, Datacenter, POP locations, and so on.

After that, you try to understand how the business can assist its consumers.

It can be retail, airport, stadium, or service provider network.

All these businesses have similar and different requirements,

For example, stadium architecture requires you to have ticketing systems, access control systems, and streaming the game, all of which are connected to the network. So, you need to understand the business requirements, how they want their revenue to appear, and how their systems interact with one another. Then, you will provide the business an architecture to support its requirements.

You may need to enable QoS or Multicast for that application, as an example.

Architecture refers to the process of gathering, analyzing, and clarifying the business requirements.

Without Architecture, a Design Is Just a Guess

The designer needs to understand the business objectives and high-level functional specifications.

In the retail store example, store sales information may be updated with some central locations such as Datacenter for the purpose of analyzing data only, and high availability requirements of the store may not have much priority.

Now, let me give an example that shows that it is pertinent that you understand why a design is important and why it requires different strategies.

A Business has 1000 sites connected to two data centers. (Technically, we call it Hub and Spoke).

It plans to open 1000 additional sites within 2 years.

The business wants to operate its WAN network. While its data is highly classified, the business carries a small amount of data between remote sites and data centers.

The business can tolerate up to half an hour downtime. Since the enterprise has many remote sites, it wants to reduce the cost of devices in the remote offices.

Ideally, the enterprise wants to operate those sites using small resources on its devices. And since there are many sites, it wants the most cost effective WAN solution.

As you must have observed, I did not mention anything technical so far.

All these requirements can be received from the business leader, perhaps the CIO or CTO of the company.

Let me translate these business requirements and the structure of the technical terms.

  • The company has many sites, and it needs scalable design.
  • The available requirements are not tight.
  • The business’s network physically fits Hub and Spoke (Star) topology.

So far, MPLS L3 VPN service from the provider seems suitable for its requirements. Let’s continue.

  • The business wants to operate its WAN network.

Now, we have eliminated the MPLS L3VPN option. If you get l3 VPN from the provider, you can have multi-point-to multi-point capability; however, you may lose your control. This is because you are transferring SLA and risks to the service provider even though you depend on their performance and control.

After understanding the architecture and business requirements, translating those requirements to technical solution is the design.

You can come up with many valid design alternatives.

But you should always proffer the simplest solution.

  • The business believes that its data is highly confidential, so we need to encrypt its data.

Based on the business requirements, IPSEC over DMVPN would be a valid design.

DMVPN can be set up over leased lines, virtual leased line, Internet, and so on.

Since its availability requirement is not tight and the business wants the most cost effective design, IPSEC over DMVPN over the Internet is suitable.

The equipment choice is important, but not necessarily, from the design point of view. The CCDE task is generally a CCDA engineer’s job.

If you are lucky, you can tell your boss that it is not your job

Which routing protocol would you choose? More importantly, do not forget that they have two data centers.

Architecture understood the applications and the systems, all of which the business needs. The business also needs the interactions those systems have with each other at the conceptual level.

The designer will translate those requirements to the technical requirements. After that, the designer will find the best technologies for these requirements.

CCIE as an operational task will translate these technical requirements and technologies to low-level configuration state.

The designer doesn’t configure NHRP, IPSEC Crypto, Routing Protocols, Redistribution, Area Assignment, and so on.

CCIE does not necessarily need to know if EIGRP or OSPF would be a better option for the business. However, CCIE needs to know how links can be assigned to the OSPF Areas, how EIGRP Stub is configured, and so on.

What would be your design for the above business requirements?


Orhan Ergun 17 Comments

CCDE Training

I am very pleased to announce that my student Hamed Zolghadri passed the CCDE Practical exam in February, and now he has joined the CCDE club Read more

Orhan Ergun No Comments

CCDE Practical exam preparation – Podcast

Wouldn’t you want to listen the story from the guys who passed the CCDE exam ?

What are their CCDE Recommended reading list ?

Is there any CCDE Training which they suggest for CCDE Preparation?

Which technologies they recommend for the CCDE candidates to focus ?

Read more

Orhan Ergun 8 Comments

CCDE Practical Exam Blueprint

What is in the CCDE Practical exam blueprint ?

If you passed CCDE Written ( 352-001 ) already, practical exam is the only barrier between you and certificate !

Below blueprint is the first step for your CCDE journey.

You will know that what are the concepts which you need to be an expert !

Read more

Orhan Ergun 12 Comments

CCDE Before and After !

Don’t expect technical topic in this post. Instead I wanted to show how was my situation before and after the CCDE – Cisco Certified Design Expert !. Enjoy 🙂



Orhan Ergun ( At the Right, Handsome one 🙂 ), Neil Moore (Only 8xCCIE in the world at the left) and Brian McGahan ( INE ) at the back.



Celebration time.. Thanks to my wife !

And.. Certificate comes. I hope this blog helps to get your CCDE.