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Re: Common operational misconceptions
From: Aftab Siddiqui <aftab.siddiqui () gmail com>
Date: Thu, 16 Feb 2012 11:20:37 +0500

Some recent questions from interview and lab sessions I took.

- I've allowed vlan X on trunk but still its not working? why do I have to
create it on every switch?
- any-any rules on firewall with AV enabled is better.
- ACL inboud/outbout misconcept. Always end up cutting the rope.
- BGP is for ISPs only.
- MPLS is for security and is fast.

Regards,

Aftab A. Siddiqui


On Thu, Feb 16, 2012 at 11:00 AM, Kenneth M. Chipps Ph.D. <chipps () chipps com
wrote:

"ISIS is used in organizations other than ISPs" Any examples you can share
of some other than ISPs?

-----Original Message-----
From: Joel jaeggli [mailto:joelja () bogus com]
Sent: Wednesday, February 15, 2012 11:58 PM
To: Kenneth M. Chipps Ph.D.
Cc: nanog () nanog org
Subject: Re: Common operational misconceptions

On 2/15/12 21:04 , Kenneth M. Chipps Ph.D. wrote:
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.

Using EIGRP implies your routed IGP dependent infrastructure is a
monoculture. That's probably infeasible without compromise even if you are
largely a Cisco shop.

ISIS is used in organizations other than ISPs.

-----Original Message-----
From: Antti Ristimäki [mailto:antti.ristimaki () gmx com]
Sent: Wednesday, February 15, 2012 10:47 PM
To: John Kristoff
Cc: nanog () nanog org
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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