Common operational misconceptions

Lee ler762 at
Thu Feb 16 00:17:57 UTC 2012

traceroute shows _a_ path.  Your packets might have taken a different
path.  (& the return traffic yet another)

labeling something "backup link" on the network diagram doesn't make it one.


On 2/15/12, John Kristoff <jtk at> wrote:
> 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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