I'm surprised I haven't seen QoS mentioned! If you're teaching college students, you might want to go over stuff that directly relates to what they're doing at home, or misconceptions they might make in a small WAN/ISP environment.
*Why disabling ICMP doesn't increase security and only hurts the web* *(path MTU discovery, diagnostics) *How NAT breaks end-to-end connectivity (fun one..., took me hours to explain to an old boss why doing NAT at the ISP level was horrendously wrong) *Not to be afraid of ACLs on an edge router. Understanding what does/doesn't affect cpu utilization *Layer 3 Switch vs Router. Old concepts like switch vs router need to be clarified... *When vendors and numbers lie ;) aka *oversubscription*! *MAC is not security *Irrelevant security concepts (smurf attacks, ping of death). More focus should be on real modern day security concerns, like layer 7 exploits, router software 0days, VLAN hopping, and UDP floods and BGP spoofing. This might be a good place to explain why downloading IOS firmware from thepiratebay is a bad idea :) This is just coming from a sysadmin who likes to play with network gear and once endured college networking classes. Thanks! Andreas On Wed, Feb 15, 2012 at 1:47 PM, John Kristoff <j...@cymru.com> 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 > >
