How Networks Really Work

Overall rating: 4.94 Instructor: 4.93 Materials: 4.78 more …

It’s pretty easy to find material explaining how to configure network devices. Internet is full of recipes and sample designs (not all of them good), but it’s hard to find information on how networking technologies really work and even harder to find out the reasons they were implemented the way they were.

In the meantime, vendors prove validity of RFC1925 Rule 11 on daily basis, and many customers blindly trust the shiny new technologies because they lack historical insight:

  • Did we try similar things in the past?
  • Did they work?
  • Why did they fail?
  • Has anything changed in the meantime that might make them better?

This webinar will help you:

  • Realize why networking matters even if you’re an application developer
  • Understand how networking technologies really work
  • Grasp why they were designed the way they were
  • Identify similarities between supposedly new ideas and past attempts

Live Sessions

The next live session of this webinar will take place in Winter 2022.

We'll continue our deep dive into advanced routing protocol topics in the next session of How Networks Really Work webinar, this time focusing on fast failover techniques: Prefix Independent Convergence (PIC), Fast Reroute (FRR), Loop-Free Alternate (LFA) and Topology Independent Loop Free Alternate (TI-LFA).

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The webinar currently covers these topics:

  • Fallacies of Distributed Computing
  • Why networking matters and why should every IT professional be interested in networking fundamentals
  • Overview of networking challenges
  • The importance of layered structure of a networking stack
  • Addressing throughout the network stack
    (local/global, address mapping, summarization, address assignment)
  • Getting packets across the network
    (source routing, virtual circuits, transparent bridging, hop-by-hop routing)
  • Differences between transparent bridging and IP routing (and why they matter)
  • Routing protocols basics
    (concepts, link-state, distance-vector and path-vector protocols, selecting an optimal routing protocol based on the use case)
  • Advanced routing protocol topics
    (failure detection, convergence, shared fate, multipathing)

The upcoming live sessions will address:

  • More advanced routing protocol topics (Fast Reroute, LFA, remote LFA, Prefix Independent Convergence (PIC), graceful restart, stateful switchover, non-stop forwarding, tunneling considerations)
  • Transmitting bits and messages (from asynchronous transport and clock recovery to escaping, zero-insertion and quoting)
  • Layer-2 line disciplines
  • Cell-mode versus packet-mode transport
  • Connection-oriented versus connectionless transport
  • The intractability of QoS
  • Congestion detection
  • In-band versus out-of-band signaling
  • Message- versus stream-oriented transport protocols
  • A day in a life of a web session

Happy Campers

About the webinar

I am older than Ethernet. This brings back a lot of memories of the good old days of networking some good some bad. Pretty interesting to have all this put together as one whole picture of the evolution of Packet and character stream technology.
jim warner
It's one of the best technical resources for people who want to improve themselves professionally.

There's a wealth of knowledge on this site and this webinar only scratches the surface.
Aaron Robinett
As always another webinar of great value for networking engineers.
Gabriel Sulbaran
This webinar describes networking fundamentals without vendor marketing. Highly recommended for everyone who wants to understand how "networks really work," or needs to build or operate a network of any size.
Erik Auerswald
If you are looking for a systematic connection of all the aspects of networking technologies from foundamental to cutting-edge, this webinar is the one you should not miss.
Chad Wang
to follow it attention , is never to late to know fundamental of network .
Fabrizio Poggio
Ivan has much to say on any topic. He clearly enjoys and explores his subject. I'm working through Nokia SROS from the ground-up at the moment after a career of Cisco and Juniper in ISP environments and a 2 year hiatus where I forgot it all. Ivan is bringing it all back to life for me and renewing my interest.

About the instructor

I almost always play the recordings at 1.5X their original speed.
jim warner

About the materials

It's fascinating to learn about the history why various standards got put in place that ignored the end to end principle.
Aaron Robinett
Highly recommended for everybody to learn something new or refresh their memory.
Erik Auerswald
I did IPv6 numbering 12 years ago for a well-known ISP in Switzerland. I left and a highly qualified network engineer changed the scheme.

Like you said, - don't spend 2 years on the addressing. It's going to change.

About the Author

Ivan PepelnjakIvan Pepelnjak, CCIE#1354 Emeritus, is an independent network architect, book author, blogger and regular speaker at industry events like Interop, RIPE and regional NOG meetings. He has been designing and implementing large-scale service provider and enterprise networks since 1990, and is currently using his expertise to help multinational enterprises and large cloud- and service providers design next-generation data center and cloud infrastructure using Software-Defined Networking (SDN) and Network Function Virtualization (NFV) approaches and technologies.

Ivan is the author of several books covering data center technologies, highly praised webinars, and dozens of data center and cloud-related technical articles published on his blog.

More about Ivan Pepelnjak