Orhan Ergun No Comments

Don’t miss this opportunity

*|MC:SUBJECT|*

 

 

Black Friday & Cyber Monday

Black Friday Thru Cyber Monday Special Discount
Starts November 24 at 5PM PST Thru November 28 9PM PST

30% OFF On Below Products ! 

CCDE In-Depth 
New CCDE Workbook buy now »

Live/Instructor-Led 
Online CCDE Training  buy now »
Self Paced CCDE Training
Lifetime Access
 buy now »

 

Orhan Ergun No Comments

These 7 people passed the CCDE Practical exam with my training

I am glad to announce that 7 of the attendees passed the CCDE Practical Lab exam in November 17, 2016 after attending my CCDE Training Program and got their CCDE numbers.

 

Read the below feedbacks from the people who passed the CCDE Practical exam on November 17 !

You can get more information and register to the next class from here. There is $500 discount until 31st of December.Seats will be limited as already 10s of people have registered.

Click here to get the CCDE book which they refer in their comments.

 

Also please know that I am organizing meeting on 26th of November in Dubai. If you want to meet in person with me please send an email to orhan@orhanergun.net

 

Reviews
    • Felix Nkansah – Chief Executive Officer at Red Mango CCDE #20160036, 2XCCIE
      If you are considering studying for the coveted Cisco CCDE certification, make good use of the Cisco recommended reading list and CiscoLive videos focused on design. But your preparation won’t be complete without a touch of Midas from the master CCDE trainer Orhan Ergun. He is the most complete training provider in the industry – Books, Blogs, Videos, Bootcamps, One-to-one chat, etc.I strongly recommend Orhan Ergun’s class if you want to pass the CCDE exam
    • Mazin Ahsan – Design Lead Engineer | Solutions Engineer | CCDE License # 20160030 | CCIE Licence # 23892
      I passed the CCDE Practical Lab exam on November 17,2016 from supplications of elders and dedication from my Sensei Mr. Orhan Ergun I took different CCDE bootcamps in the past. Orhan has the most depth and expertise. You can discuss with him at an expert level on different technologies and he is focused. Both the bootcamp and his book helped me a lot in achieving the design skills to nail this beast. I would recommend taking his CCDE training to pass CCDE exam and learn the network design
    • Tahir Munir – Infrastructure Consultant at Accenture CCDE #20160031, 3XCCIE
      I passed the CCDE exam on November 17. Orhan’s CCDE Live class and Self Paced training course helped me a lot to pass the both CCDE Written and Practical exams.Design comparison charts and videos will help you a lot in CCDE Practical exam. The quizzes in the self paced CCDE course is excellent resource for the CCDE Written exam.If you are studying for CCDE exam or want to learn network design,I strongly recommend you to take this course.
Michael “Zig” Zsiga II – Lead Technical Architect at ePlus Technology CCDE #20160032, 2XCCIE
I passed the #CCDE today! I used a lot of resources to be successful but I need to call out one specifically. Thanks Orhan Ergun for always being available at all hours to answer every question, to discuss every technology, and to work through my personality “issues” that I had throughout this process!! For all my friends venturing down the CCDE path Orhan is a great resource and friend to have!
  • Nicholas Russo -Network Consulting Engineer (CCDE/CCIEx2), Cisco
    I signed up for Orhan’s self-paced CCDE training. This training is very technically detailed and the use-cases, quizzes, scenarios, and mind maps are all great resources in the overall training program. Orhan teaches his customers to think like a network designer by applying technology to meet business requirements and design specifications.
  • Chintan Sutaria Network Specialist at GBM CCIE, CCDE#20160026
    I passed the most respectful Cisco exam CCDE on November 17,2016.Orhan Ergun’s class was great and helped me a lot to pass the CCDE Practical exam. There was so many resources in his class to consume and He is always available to discuss the design topics with you. Anyone who would like to pass the CCDE exam go to the best.
  LET’S CELEBRATE IT TOGETHER ON FEBRUARY 2017 !
chintan_orhan
Orhan Ergun & Chintan Sutaria
Orhan Ergun No Comments

CCDE In-Depth: The New CCDE Book of Orhan Ergun Is Available

Finally, I have published my new CCDE book titled CCDE In-Depth.

The much-awaited book is available in three version: PDF, Kindle and Paperback versions. You can purchase the PDF version directly from this website. And if you need the Kindle and Paperback version, it is available on Amazon.

Why This Book Is the Best for CCDE Preparation

Many experts believe that CCDE In-Depth is one of the best books you can use to prepare for CCDE Exams. And below are the reasons why you need to read this book:

  • This simple and easy-to-read guide will provide you many real-life network design case studies.
  • This book provides a detailed  design information of  Layer 2 technologies, General Network Design and Design Tools, OSPF, EIGRP, IS-IS, BGP, MPLS, Multicast, QoS, VPN Design, and IPv6 Design topics, and the case studies are used to provide more explanations.
  • This book covers both CCDE Written and the Practical Exams.
  • This book has hundreds of question, which will help you to learn everything about network design and pass the CCDE Written Exam.
  • The technology comparison charts provide the alternatives, teaches the pros and cons of the technologies, and highlights the important design aspects of them.
  •  The full length of the two CCDE Practical Lab Scenarios are presented in this book. These CCDE scenarios will teach you how to approach the questions in the real exam.

Read More about the book

Purchase paperback from Amazon

Purchase PDF version from Website

 

Orhan Ergun No Comments

Last Three days for the 10 days Online CCDE Practical Bootcamp

Last three days for the November 10 days Online CCDE Bootcamp ! By November 1, I am going to start my NEW CCDE Practical Lab Training.

There are couple things to highlight. Online Bootcamp is Instructor-Led Bootcamp. I will be in the class and explain everything you need to pass the CCDE Practical exam. Instructor Led doesn’t have to be Online only though.

I provide In-Class training as well. 2017 Onsite CCDE Training locations will be announced by 20th of November.

As you might know in August 2016 CCDE exam 10 people pass the exam in the world but 6 of them used my materials and shared their feedbacks already on the website and social media.  Read more

Orhan Ergun No Comments

Benefits of MPLS – Why MPLS is used ? – MPLS Advantages

Benefits of MPLS, Why MPLS is used on today networks and the Advantages of MPLS will be explained in this post.

As an Encapsulation and VPN mechanism, MPLS brings many benefits to the IP networks. In this article most of them will be explained and design examples will be shared by referring more detailed articles on the website as well.

Below list shows the benefits of MPLS. Although this may not be the full list, comment section always open for your comment and questions.

 

  • Faster packet processing with MPLS compare to IP

Read more

Orhan Ergun No Comments

BGP in MPLS Layer 3 VPN – BGP as a PE-CE Routing Protocol

BGP can be used as a PE-CE routing protocol in MPLS Layer 3 VPN. Also Service Providers run MP-BGP (Multiprotocol BGP) if they have MPLS Layer 3 VPN.

In this article, MP-BGP will not be explained since it has been explained here earlier in detail.

When BGP is used as a PE-CE routing protocol between the customer and its MPLS Layer 3 VPN Provider, it is important to say that there is no need to redistribute on the Service Provider PE. All the other routing protocol require redistribution from MP-BGP into the routing protocol and vice versa.

In this post, I will explained what are the design considerations when BGP is used as PE-CE routing protocol in MPLS Layer 3 VPN and the how you can mitigate possible routing loop problems.

Last but not least, I will share when CE (Customer Equipment) is multihomed to two PEs (Provider Edge Device), what would be the design considerations if BGP is used in MPLS Layer VPN. Read more

Orhan Ergun No Comments

OSPF to IS-IS Migration

There are many reasons of OSPF to IS-IS migration, specifically for the Service Provider networks. Some of these reasons are shared later in the case study.

OSPF to IS-IS migration can be done in three ways. Read more

Orhan Ergun No Comments

Design considerations for network mergers and acquisitions

Network mergers and acquisitions are the processes which can be seen in any type of businesses. As a network designers, our job to identify the business requirements of both existing networks and the merged network and finding best possible technical solutions for the business.

There are many different areas which need to be analyzed carefully. Wrong business requirement gathering and design analyze, definitely lead to catastrophic failures.

Business and network analysis and technical information gathering are the key steps and there are many questions which need to be asked and answered should be well understood.

Network mergers and acquisitions is also called as Network integration.

Below are the key points for any type of network mergers and acquisitions projects.

  • Business analysis and information gathering

Read more

Orhan Ergun No Comments

OSPF Multi-Area Adjacency | OSPF Area Placement | RFC 5185

OSPFv2 by default setup only one adjacency over a single link. But this can be an issue some time and as a network designer you should understand the consequences and know the available solutions.

Placing a link in wrong OSPF area can create an OSPF sub optimal routing especially in hub and spoke topology.

In IS-IS or OSPFv3, this wouldn’t be an issue because IS-IS and OSPFv3 allow link to be placed in more than area or level. (In IS-IS, area is assigned to the router, not to the link. Thus I use level keyword)

Let’s look at the below network to understand what is the issue and how OSPF multi-area adjacency can solve the sub optimal routing problem. Read more

Orhan Ergun No Comments

IS-IS Design considerations on MPLS backbone

IS-IS Design considerations on MPLS backbone

Using IS-IS with MPLS require some important design considerations. IS-IS as a scalable link state routing protocol has been used in the Service Provider networks for decades.

In fact, eight of the largest nine Service Providers use IS-IS routing protocol on their network as of today. Read more

Orhan Ergun No Comments

Carrier Ethernet – Definition | Service Types | Requirements

CARRIER ETHERNET DEFINITION

Carrier Ethernet is an attempt to expand Ethernet beyond the borders of Local Area Network (LAN), into the Wide Area Networks (WAN).

With Carrier Ethernet, customer sites are connected through the Wide Area Network. Carriers have connected the customers with ATM (Asynchronous Transfer Mode) and Frame Relay interfaces in the past. (User to Network Interface/UNI). Read more

Orhan Ergun No Comments

IPv6 Transition Mechanisms | Dual-Stack -Tunneling – Translation

IPv6 Transition Mechanisms

The only available public IP addresses are IPv6 addresses. But vast majority of the content is still working on IPv4.

How IPv6 users can connect to the IPv4 world and How IPv4 users can reach to the IPv6 content ? This is accomplished with the IPv6 transition mechanisms.

In this post, I will explain the IPv6 transition mechanisms briefly, share some of my IPv6 real life design experiences and observations and will provide a road map for the future IPv6 design and deployment resources which I am going to cover on the website.

Read more

Orhan Ergun No Comments

BGP Peering – Private, Public, Bilateral and Multilateral Peering

BGP Peering

BGP Peering is an agreement between different Service Providers. It is an EBGP neighborship between different Service Providers to send BGP traffic between them without paying upstream Service Provider.

 

To understand BGP peering, first we must understand how networks are connected to each other on the Internet. The Internet is a collection of many individual networks, which interconnect with each other under the common goal of ensuring global reachability between any two points.

 

BGP peering
BGP Peering and Transit Links

Read more

Orhan Ergun No Comments

What is reliability in networking ?

What is reliability in networking ? Why reliability is an important design tool ? I will provide the answers of these questions with the examples in this post.

Reliability is within the reasonable amount of time, which depends on the application type and architecture, delivering the legitimate packets from source to destination.

This time is known as delay or latency and it is one of the packet delivery parameters. Consistency of delay known as jitter and it is very important for some type of applications such as voice and video, jitter is our second delivery parameters.

Read more

Orhan Ergun No Comments

Spanning Tree Best Practices

Spanning Tree Protocol (STP) is a control plane mechanism for Ethernet. It is used to create a Layer 2 topology (a tree) by placing the root switch on top of the tree.

Since classical Ethernet works based on data plane learning and Ethernet frames don’t have TTL for loop prevention, loops are prevented by the STP blocking the links.

As you can see from the below figure, some links are blocked by the spanning tree. If Spanning Tree wouldn’t block those links, loop would occur in the below topology.

Read more

Orhan Ergun 1 Comment

BGP (Border Gateway Protocol) Quiz,Questions and Detailed Answers

BGP (Border Gateway Protocol) a.k.a Bloody Good Protocol quiz !

I prepared 20 Questions in this quiz for you. Intend of this quiz to provide you the BGP design information.

This quiz is part of the BGP Review Questions of my upcoming new version of CCDE Workbook. There will be hundreds of questions in it and will be available shortly !

This quiz helps for CCDE Written and CCDE Practical exam as well as real-life Network Engineering Interviews.

For more quizzes and many other design resources such as videos, mind maps and the my books, you can subscribe and access immediately. Click here to subscribe Self Paced CCDE Course 

Read more

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:

Read more

Orhan Ergun 2 Comments

Inter-AS Option AB (a.k.a Option D)

Inter-AS Option AB is also known as Option D or Hybrid Inter AS Option. It is called Hybrid because Inter-AS Option B uses the best capabilities of Inter-AS Option A and Inter-AS Option B. These capabilities will be explained throughout this post.

MPLS VPN providers often need to inter-connect different ASes to provide VPN services to customers.

Inter-AS Option AB first deployed by Cisco but today many vendors including Juniper provides Inter-AS Option AB feature.

But what are the best capabilities of the Inter-AS Option A and Inter-AS Option B ? Read more

Karim Rabie 1 Comment

Mobile Broadband – Trending Technologies

For me and for most of Mobile broadband professionals, we are used to meeting the Telco Vendors such as Ericsson, Huawei, Cisco, Nokia, etc. It was a mind-shift for me personally when I started to meet RedHat, Mirantis, & Vmware as a part of the NFV talks and I was really surprised that a company like RedHat is a member of the European Telecommunications Standards Institute (ETSI) with more focus on the Mobile Broadband Evolution participating in Mobile Edge Computing (MEC) Work Group.

It is obvious nowadays that the borders between different technology domains are fading in the sense that Networks are shifting into software-defined Networks with new abstraction layers realizing network convergence.

With this post being the last one, I chose to talk a little bit about some trending and future Mobile Broadband technologies with the goal of having an overview of the Technology Roadmap.

NFV (Network Functions Virtualization)

Read more

Orhan Ergun 1 Comment

August 2016 10 days Online CCDE Training

ccde bootcamp orhan ergun

 

 

CCDE Bootcamp – This is 10 days  Online Cisco CCDE exam preparation training. No travel, no accommodation or any other extra cost !

 

Probably you all know the success of Orhan Ergun’s CCDE Bootcamps and how it has been helping so many engineer to become a better network engineer/designer. If you don’t know, please just take a tour on the website. Check the Success Stories/Testimonials. 10s of my students passed the CCDE exam already !

Let’s continue to our journey with the August 2016 CCDE class. 10 days very comprehensive Cisco CCDE course !

Please note that, there is a 20% discount for the registrations until 5th of August.

When you register to this class, any upcoming retake is totally free.

I will place you in a study group with the other 20 CCDE candidates. Even after the class we will continue to study together.

Are you ready to pass the most respectful Cisco certificate !

Register Today with 40% Discount 

 

CCDE BOOTCAMP CONTENT 

Module #1 Introduction to CCDE exam Read more

Karim Rabie No Comments

Evolved Packet Core – Welcome to Long Term Evolution!

As an end user, I am always welcoming the “4G” Signal indicator on my mobile because basically for me this maps to a better Download Speed, good quality VoIP calls (skype, Hangout, Whatsapp, etc) , better Streaming, and HD Videos.

Screen Shot 2016-07-23 at 5.03.16 PM

This article is all about the “4G” indicator. I am discussing the Evolved Packet Core together with the EUTRAN, Evolved Universal Terrestrial Radio Access Network Technologies that are realizing the 4G Service offered to end users.

 

 

With Data rates above 100 Mbps and latency of milliseconds that enables the best video streaming and online gaming experience; One may think of 4G networks as a replacement for 2G/3G Network which is valid in some cases. However, we see that the decision to “dismantle” 2G/3G is still in the operators roadmaps.

Before we go through the  LTE/EPC Network Setup, Let’s list three main definitions and abbreviations that are closely related to 4G. Read more

Orhan Ergun No Comments

IS-IS level 1, IS-IS Routing Protocol Levels

What is IS-IS Level 1 ? Why IS-IS level 1 is used ? What are the IS-IS levels ? What is the corresponding Area type in OSPF ?

IS-IS Level 1 is also called as IS-IS Level 1 sub domain. IS-IS is a link state routing protocol, similar to OSPF. You can read detail comparison of OSPF vs. IS-IS from here.

There is an Area concept in IS-IS as well but the purpose of IS-IS Areas are different than OSPF Areas.

In IS-IS Areas are used to create  IS-IS Levels and IS-IS Levels are the similar logical concepts with OSPF Areas.

 

Two create IS-IS Level 1 adjacency between two routers, same IS-IS area number should be used. Otherwise only IS-IS Level 2 adjacency can be created. This is the first rule of IS-IS adjacency relationship.

 

Which OSPF Area type is similar to IS-IS Level 1 Sub domain ?

Read more

Orhan Ergun No Comments

What is MPLS tunnel label and why it is used ?

In networking we use many times different terms to define the same thing. MPLS tunnel label or transport label are just two of those.

Not only transport and tunnel labels but also other terms are used to define the same thing which these labels provide.

Let me explain first why and where MPLS tunnel label is used. Read more