Common operational misconceptions

Kenneth M. Chipps Ph.D. chipps at
Thu Feb 16 05:04:01 UTC 2012

How widespread would you say the use of IS-IS is?

Even more as to which routing protocols are used, not just in ISPs, what
percent would you give to the various ones. In other words X percent of
organizations use OSPS, Y percent use EIGRP, and so on.

-----Original Message-----
From: Antti Ristimäki [mailto:antti.ristimaki at] 
Sent: Wednesday, February 15, 2012 10:47 PM
To: John Kristoff
Cc: nanog at
Subject: Re: Common operational misconceptions

"IS-IS is a legacy protocol that nobody uses"

15.02.2012 22:47, John Kristoff kirjoitti:
> Hi friends,
> As some of you may know, I occasionally teach networking to college 
> students and I frequently encounter misconceptions about some aspect 
> of networking that can take a fair amount of effort to correct.
> For instance, a topic that has come up on this list before is how the 
> inappropriate use of classful terminology is rampant among students, 
> books and often other teachers.  Furthermore, the terminology isn't 
> even always used correctly in the original context of classful addressing.
> I have a handful of common misconceptions that I'd put on a top 10 
> list, but I'd like to solicit from this community what it considers to 
> be the most annoying and common operational misconceptions future 
> operators often come at you with.
> I'd prefer replies off-list and can summarize back to the list if 
> there is interest.
> John

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