What is IPv6 Dual stack? What does IPv6 dual stack exactly mean?
What is IPv6 dual stack ? From some questions and comments on the website, I understand that there is a confusion about it. So, what does exactly dual stack IPv6 mean ? IPv6 is not a luxury anymore. It is not avoidable for the Service Providers especially. The biggest problem for the Service Providers […]
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What is Layer 0 in the OSI Layers ?
What is Layer 0 in the OSI layers ? Isn’t OSI (Open Systems Interconnection) seven layers? Yes it is. In the standard, seven layers have been defined. Just let’s remember the seven layers of OSI. Layer 7: The application layer. Layer 6: The presentation layer. Layer 5: The session layer. Layer 4: The […]
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Is it really hard to spell ‘ Orhan Ergun ‘ ?
Is it really hard to spell ‘ Orhan Ergun ‘ ? I see a lot of different variations of my name, its funny though ? Below are some search keywords which people used to find something related with me. I know my name is not very common. In fact, among English speaking people, one […]
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Flat OSPF network is not a problem ! But
Flat OSPF network, or single area OSPF networks are real. In fact most of the OSPF network today deployed, is flat OSPF networks. But how many routers can be placed safely in an OSPF area ? Any number from the real world OSPF deployment ? I will share in this post. Let me explain what […]
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Last 10 days for the August 2017 CCDE Online Bootcamp
My Webex based, Online CCDE Bootcamp will start in 10 days. August 7, 2017 is the first day of my live CCDE Bootcamp. As the best CCDE Training, I will cover all CCDE Blueprint topics as usual. Before and after the Bootcamp, there are many other resources which you will go through. These […]
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Moved to new house , Finished the new course but !
I have been very busy for last one month. I announced 2 , 3 months before Service Provider Design Workshop and conducted it at last two weekends. I moved to new house, lot’s of things to deal with, believe me. First time I will share the photos of it here. Meanwhile I […]
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Study tip – How you should read the posts on any website
You search something on Google, or read the materials by referrals. You do research on a particular topic and find many resources. How you are organizing your study ? What is the most important thing even before you start reading any technology topic ? Technology is changing g too fast. At least the many areas in networking. […]
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Route where you can , switch where you must – Is it true ?
Route where you can , switch where you must. If you are from networking background most probably you heard this many times. But is it true or like anything else, does it depend on the situation and other parameters ? Yes, you are right, it depends. When you hear a quote , at […]
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Risk Management in Submarine Cable Systems
Risk Management in Submarine Cable System Submarine networks carry over 99% of the world’s Intercontinental electronic communications traffic. There is misconception that Satellites carry data from continent to continent. If we ask anyone in the world, 95% of people give answer as satellites carry international traffic. This is absolutely wrong. The Internet, International […]
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Free Knowledge Sharing Group for Service Providers !
Recently I initiated a knowledge sharing group on Skype. Goal of the group is just a knowledge sharing. What technologies, protocols, equipments are other people using in the in their networks, what are their services , what are their paint points and benefits of using particular technologies and so on. Currently group has around 100 […]
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Submarine Cable Basics
Submarine Cable is probably the most important topic for the International traffic. More than 99% of the International traffic , including data, voice and video is carried over Submarine Cables. But still submarine cables is not very well known topic among the network engineers, especially if you are not working in the Service Provider, […]
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What is Urban and Rural area in networking ?
What is urban and rural area ? What is underserved area in networking ? These definitions are heavily used in networking. And all broadband network designers take always these definitions into an account while they do their design. I think knowing these definitions as a network engineer is valuable for you. In general, […]
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Is there a Global Tier 1 Provider in the World ?
Is there a Global Tier 1 Internet Service Provider in the World ? Who are the biggest networks in the World ? In the Peering article I explained what is peering , different types of peering such as private and public peering , settlement free peering , paid peering and so on. To […]
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Some recommendations for the network engineers
In this post, I will share many network engineering blogs which will be very beneficial for the network engineering and for those who want to learn more about network design. Almost everyday I receive a message through social media or via email from the connections. What should we study ? I am new […]
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What is MPLS Traffic Engineering and Why do you need MPLS-TE ?
MPLS Traffic Engineering is a mechanism that provides cost savings in an MPLS networks. How cost saving can be achieved ? How traffic is steered to the paths which wouldn’t be used in normal circumstances ? I will explain in this post. Let’s look at below topology. MPLS Traffic Engineering […]
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Windows Firewall ? This made me laugh a lot :)
Do you agree that this is similar to Windows Firewall ? ? Made my day
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What makes for a successful protocol ?
What makes for a successful protocol ? Which protocol is successful and why ? Have you ever been asked these questions ? As an engineer you cannot say I believe Protocol X is successful or Protocol Y is not. There is nothing like ‘ I believe ‘. There should always a science behind […]
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Some people who passed the exam on FEB 2017 lost their CCDE !
As you know May 11 2017 exam has been cancelled. I shared the details in this post. Cisco took very hard decision but saved the CCDE certification. I have been suggesting that new scenarios should be added for a long time. Read this post and see why I have been suggesting it. As you know, […]
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May CCDE Practical exam is cancelled worldwide,all the details !
May 11 2017, CCDE Practical exam has been cancelled worldwide on May 4, 2017. People reacted differently for this cancellation. I have 200+ CCDE candidates in my study groups, thus I think I am the person who can provide you the most accurate information about the reaction of the candidates. Most, if […]
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