Troubleshooting is a fundamental skill for all network engineers, from the least to most experienced. However, there is little material on correct and efficient troubleshooting techniques in a network engineering context, and no (apparent) live training in this area. Some chapters in books exist (such as the Computer Networking Problems and Solutions, published in December 2017), and some presentations in Cisco Live, but the level of coverage for this critical skill is far below what engineers working in the field to develop solid troubleshooting skills.

I’m teaching a live webinar, How the Internet Really Works, next Friday on Safaribooks.com. You can register here. I’ve expanded this from a three-hour webinar to a four-hour webinar, which means I’m adding about 30’ish slides, and redoing a few bits and pieces of the presentation. In fact, I’m revamping a few of my webinars, creating two new ones, rebuilding two of them as livelessons, and working on some new material with Ethan as well.

Please join me this next Friday—first time with the new slides, so it should be interesting.

I am teaching a live webinar, How the Internet Really Works, on Safari Books Online on the 20th of March. I have expanded the material a bit, and plan to slow down a little, so it is now a four hour session. Generally, I start with DNS, then look at routing, then finally at organizations and other odds and ends. My general goal is for you have a broad overview of the technical bits, as well as an understanding of the costs and income streams of the major players. I will probably also discuss some of the current challenges facing the Internet, as I have a little bit more time, including the problems transit providers are facing and the general “centralization of everything” we are starting to see.

Webinar registration is available here.

My next course on Safari Books is a data center design webinar. I’ll talk about the history of the Clos fabric, fabric sizing with single-SKU designs, some of the pros and cons of single-SKU versus chassis based scaling, and underlay control planes. I generally go through these slides each time I give one of these webinars and rework various bits and pieces of it to smooth over things I remember being “rough” last time, and to update the material based on what I think is more relevant.

Sign up here.

On December 13, 2019, I’m giving a three-hour webinar over at Safari Books on How Routers Really Work. From the description:

This training will peer into the internal components of a router, starting with an explanation of how a router switches packets. This walk through of a switching path, in turn, will be used as a foundation for explaining the components of a router, including the various tables used to build forwarding tables and the software components used to build these tables.


I am teaching a three hour webinar on troubleshooting this coming Friday, October the 19th. This is a “deep theory” webinar focused on the half-split method of troubleshooting, a formal method used widely in electronics and other engineering disciplines. There are still seats available—sign up now!