IP NGN Technologies

[Khaled AlJorf]

Hi Orhan,

Do we need to have a deep knowledge on the IP NGN technologies like DWDM, SONET/SDH, SPT/RPR for the written/practical exams?

regards

Khaled

[Ryan Hicks]

Hi Khaled,

 

It has been a while since I have taken the exam, so I may be out of date here, but technology details of that sort don’t really hold with the purposes of the exam.  That said, your RPR topic could come up when validating or justifying a topology design, but I don’t see that DWDM or SONET details are going to be a topic any more than the fact that they are transport.  Any reference to them would likely come in the order of judging the impact they would have on a design (redundancy, path efficiency, capacity, etc.)  I would also recommend keeping in mind how they fit the OSI model.  DWDM for example is just a way to have multiple 10 Gbps circuits (for example) over one pair of fiber.  At a design level, I know ii have very scalable bandwidth, but I have no redundancy, since DWDM just carries some layer 2 standard’s light.  I might be able to implement redundancy with SONET over DWDM, or with IP routing at L3 over diverse DWDM paths.

 

In short, I wouldn’t spend a lot of time on these technologies and focus more on the L2 and L3 technologies.

 

My 2 cents…

 

Ryan Hicks

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[Federico Cossu]

well, i wouldn't say that SPT/RPR or SONET/SDH are "NGN" technologies. in any case the exam does not cover transport technologies in deep so you just need to know what they are meant for. transport technologies would require a separate "Layer1" exam since they are also evolving fast, i see a more and more interest in convergence between the IP and transport layer where the transport layer is almost ethernet everywhere today, SDH/SONET and L2 rings are slowly disappearing (even if i still see railway/subway/metro networks with G8032!), while MPLS is going over its classic PE boundaries. Convergence between optical and IP layer glued by SDN (since GMPLS-UNI is already dead due to its limited applicability despite "standards") seems to be key for the evolution of NGN networks, i would like to hear orhan, russ and other's opinion about that.

ciaociao

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[Orhan Ergun]

Hi Khaled,

Neither of them requires deep Layer 0 , 1 or 2 knowledge. This is a Layer 3 Infrastructure exam but still you need to have some familiarity with those technologies in order to understand the business of the given company.

In every scenario you will be given the network topology , physical connections , transport and transmission information but you wouldn't be asked like GFP of OTN , APS in SDH and Framing of it and so on. But again you may want to know what are the pros and cons of  circuit switching technologies such as SONET/SDH , NG SDH, OTN or NG OTN and how they interact with the packet world and so on. 

I would say that you need to have familiarity with the many other technologies as well. For example you want to understand basic storage technologies , such as What is FC , FCOE and so on but you don't need to know how FSPF works. 

CCDE is not looking for Storage , Transport , Voice , Security , Transmission architects but basic knowledge for all these areas as an Infrastructure Architect 

Cheers,

Orhan Ergun

31 Mayıs 2015 Pazar 08:18:10 UTC+3 tarihinde Khaled AlJorf yazdı:

[Khaled AlJorf]

Thanks all for the feedback. Do you recommend having a quick look at the below ciscopress title by Robert Wood for the same?

http://www.ciscopress.com/store/next-generation-network-services-9781587053856

regards

[Russ White]

Neither of them requires deep Layer 0 , 1 or 2 knowledge. This is a Layer 3 Infrastructure exam but still you need to have some familiarity with those technologies in order to understand the business of the given company.

When you're considering whether or not to study a particular technology -- or even what, specifically, to study about that technology, you should always ask -- "what different does this make to design?" In the case of layer 1 technologies, what matters? How fast you can detect a failure, if there are situations where you can't detect a failure (and how to get around them), odd failure situations (can you lose just multicast, or have asymmetrical links?), multicast support, quality of service -- things like this. For instance, if you were thinking about an older resilient packet ring (SRP I think it was called), then you'd think -- well, if one half of the ring fails, I don't need to route around, though I will get increased load on the other half, which impacts my design by implying I need to pay attention to load, but not to necessarily have parallel links..." 

Each technology is going to be different, but if you can learn to ask -- 'what difference does this make to design,' then you'll be on the right track to understanding how to design around that technology. That's the sort of thing you should hit on the test.

[Russ White]

http://www.ciscopress.com/store/next-generation-network-services-9781587053856

MSSP and ATM? Not likely... 

:-)

Russ