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Full-on CCIE study mode.

I am now in the final phase of lab prep for my CCIE R&S v5 exam. I am disconnecting from as much media as possible to focus all minutes of the day possible on the exam. Hopefully in 90 days

Posted in Certification, Education

OSPF Order of Preference.

Warning chicanery ahead. Here we have an unassuming and and quite modest OSPF network.  The problem we have is that due to OSPF order of preference, traffic transiting from R1 – R4  (to R4’s loopback interface [4.4.4.4, Area 0]) will

Posted in Education, Routing

RE: Simple STP Problem 80% Get Wrong

I have had some very interesting feedback (mostly of disbelief at my answer) including from a very popular certification prep vendor’s technical editor about this post.  As a cross reference see my other post titled “Simple STP Problem 80% Get

Posted in Education, Switching

Got Nothing Good…

No really…I have nothing to post.    Delivering an introductory MPLS training and working on CCIE lab study.  If you have not done so take a look into MPLS-VPN.  It is way cool.   Have a good week!

Posted in Education, Personal

EIGRP Auto Summary – Part II

In part two of our analysis of the EIGRP auto summary feature, lets look at the first two step in our flow chart.  To recap, we had determined that the path to auto summary was a bit more deceiving than

Posted in Education, Routing

EIGRP Auto Summary – Part I

Looking over the CCIE R&S Blueprint I wanted to read up on the EIGRP auto summarization feature.  From what I had recalled from studying previously it is not as simple as the name or many discussions (like blog posts…) make

Posted in Education, Routing

Simple STP Problem 80% Get Wrong

The 80% number is just a shot in the dark guess it may be lower or higher but I personally have not had anyone answer this question correctly.  Looking at various documentation the 4th STP tie breaker is not well understood.

Posted in Education, Switching
Charles Stizza

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  • Coming Full Circle on IPv6 Address Length September 26, 2017
    In the Future of Networking with Fred Baker Fred mentioned an interesting IPv6 deployment scenario: give a /64 prefix to every server to support container deployment, and run routing protocols between servers and ToR switches to advertise the /64 prefix to the data center fabric preferably using link-local addresses.Let’s recap:Read more ...
    Ivan Pepelnjak