Interesting links | 2008-10-12

4 comments:

  1. Ivan, thanks for the links!!!
    I thought of creating a Pineapple Certified Religious Bovine Professional certification. What do you think? You can have PCRBP #00001.
    To be more democratic about it, I have created polls around these myths, based on the Mythbuster's methodology. They are called Redibusters:
    http://thinkingproblemmanagement.blogspot.com/search/label/Redibusters

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  2. NAT looks at the packet (and creates the translation) even if the inbound ACL drops it.

    I have seen this behaviour as well.

    I only caught it because I was testing something so I had ACL's going in both directions on interior & exterior interfaces.

    My internal conversation went something along the lines of, "WTF, I'm blocking that, it shouldn't even be traversing across the router"

    Sometimes I wonder

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  3. I used to think that certifications were a useful indicator of knowledge or at least initiative, but I'm changing my mind. I interviewed a guy last week who had a whole pile of Cisco certifications (CCNP, CCSP, CCVP, CCDP, at least). I asked him some elementary questions about how packets flow across a network. He couldn't describe ARP. He had trouble with the difference between static and connected routes. He couldn't describe how a TCP handshake works at all. He couldn't accurately describe the the difference between a physical interface being up and a line protocol being up.

    He then claimed to be much better at Cisco voice. So I asked him some basic CallManager and IOS voice gateway questions, and he completely flunked those. He was "absolutely, 100% certain" that MGCP controls phones, not gateways.

    This was the most egregious example I've seen, but not the only one.

    I feel like I've gotten a lot out of studying for certifications, especially CCIE, but I'm starting to wonder if that's the exception.

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  4. I am honestly confused i was thinking getting certified was something like gaining all knowledge in that domain also i think we learn from experencie only O:-) O:-) O:-) O:-)

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Ivan Pepelnjak, CCIE#1354, is the chief technology advisor for NIL Data Communications. He has been designing and implementing large-scale data communications networks as well as teaching and writing books about advanced technologies since 1990. See his full profile, contact him or follow @ioshints on Twitter.