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Techtorial 2023

 Hello Folks! I am going to write a short post about my Hungarian Techtorial 2023 experiences. Why am I do it? Because I have not have new topic in CCIE learning path. Last time I posted about BGP and IGP and I could write a deep-dive thing about them, but I think that can not be interesting in this platform. So I decided it that I write a a little about my Techtorial experiences.    Ok! What is techtorial? I think the Hungarian Cisco Techtorial was a network engineering celebrity day, like the ITBN for Security Engineers. My first event was at 2015 when I worked for the MT (Hungarian Telecom). It was a great time to talk with very smart people about the newest technologies, I learned many new technologies. Nowdays the event is good, but I can not see the twinkling and sparkling behind the programs, but I changed not the event. (If it will be 2 days program again with hotel room... ;) ) In this year, the event was kept in the Etele Plaza Cinema (yeah like in 2022). There...
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CCIE# 69065 0v1 - Élménybeszámoló

  Kedves Olvasó, Nagyon rég volt szerencsénk egymáshoz, hiszen az elmúlt 2-3-4 évben sajnos nem tudtam ezen platformon kellő számban megjelenni. Pedig terveim voltak, olyanok például, hogy a szokásos Techtorial / ITBN és egyéb élménybeszámoló, illetve hálózat biztonsági esettanulmányok mellett a CCIE Service Provider felkészülésemről is írok némi dokumentációt... Sajnos ezek mind-mind elmaradtak és nem is fogom pótolni, mert ami a múlt, az már elmúlt.   Cserébe van sok-sok izgalmas terület, amivel érdemes és kell is foglalkozni azok számára, akik hálózati terület iránt érdeklődnek. Ilyen például az AI fejlődése a hálózat monitorozó vagy menedzselő rendszerek esetén, vagy olyan "új" paradigmaváltó megoldások mint a segment routing...   Mivel, most számomra aktualitás éppen a CCIE vizsga és annak pozitívan könyvelhető eredménye, ezért élménybeszámoló jelleggel írhatok majd egy kis szösszenetet a Segment Routing megoldásokról és ahhoz kapcsolható egyéb "újdonságokról",...
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CCIE SP v5.1 Lerning journey #69065 JFC, OSPF Authentication

 Is it the last post about OSPF?   I hope this is the last main topic post of OSFP, but many functionalities have not been talked about, so OSPF parts should be in the future post like sham-link , opaque LSA and soon on.   Why OSPF authentication is important?   Why should service providers use IGP authentication?   As I mentioned in my other post IGP is one of a most important thing in a service provider life. IGP is the responsible of the backbone IP network control plane. If a bad face guy can access for the SP's infrastructure...    ... And here the post ended, because I have no time to serve my readers....    Life is hard, you have to prioritize your tasks... I would have liked to write these post, but everyday life is more important, than this hobby.   May I will write about my exam preparation... or the next post can be a report about the experience...   At this this time, that's all folks...        
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CCIE SP v5.x Lerning journey #xxxxx4 What is the newness in OSPFv3?

 OSPF again  Why OSPF is such important? Why do I care for this topic so much time?   Interesting questions, I do not really know. When I start to process a topic for my exam preparation I do not know how much time I have to learn it. But when I learn it, I feel the importance of the subject area.     If you would like to read more detailed information about OSPF I suggest that link: https://www.ciscopress.com/articles/article.asp?p=2294214&seqNum=4   So let me explain to you that what are the differences between OSPFv2 and OSPFv3? In a high level view the two protocols are only different in the Internet Protocol version support. OSPFv2 is only support IPv4. OSPFv3 support both AFs (address family), but If you wanna know some detail about the other differences you need research better this topic. 1. Network types In OSPFv2 there is 5 network type which is the same in OSPFv3 broadcast non broadcast point-to-point point-to-multipoint point-to-multipoint ...
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CCIE SP v5.x Lerning journey #xxxxx3 Deep Dive of IGPs: OSPF part 2

Hello there! I can not leave the OSPF subject because  it is too beautiful to abandon it. In this post I try to demonstrate how the LSAs work in different OSPF scenarios. In the last post I wrote what is the LSAs, which network type is available, and which router types are exist in an OSPF network. But I do not described these things. On this post I try to define these topics better.  To understand that LSAs how can be flooded on different areas you need to understand the area types. As I mentioned before, there is 5 type of area exist of OSPF. Basically in a backbone/regular area the following LSA types will be flooded: Type 1 Router LSA Type 2 Network LSA Type 3 ABR Summary LSA - if ABR exist in the area. Type 4 ASBR Network LSA - if ASBR exist in the area. Type 5 ASBR Summary LSA - if ASBR exist in the area.  Backbone area is special, because it is responsible for the other area can be connected each other. And what about stub area? Stub types of areas help us to redu...
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