Common operational misconceptions

[cra at WPI.EDU (Chuck Anderson)]

ICMP is bad, and should be completely blocked for "security".

On Wed, Feb 15, 2012 at 02:47:15PM -0600, John Kristoff 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