Recent Articles

IP Subnetting Part 1 - IPv4

Despite the large number of jokes in high school about never needing to use mathematics after graduation, the art form known as IP Subnetting requires a solid grasp of math based on binary numbers (0, 1).  In this first part of my devoted attention on IP Subnetting, we'll focus on Internet Protocol version 4 (IPv4) addressing, some history, and the methods available to make IPv4 addressing go farther.

Understanding the "network" command

Many network engineers seem to misunderstand the use of the network command in routing protocols on Cisco IOS, especially once they see the usage in BGP.  This occurrence happens more frequently with those studying to become a CCNA, but may not be obvious to experienced engineers either.  Based on my own experience, I have very distinct memories of confusion when the concept I understood was first corrected by a more experienced engineer.  So let's breakdown the confusion.

Troubleshooting with OSI Model

At Layers 1-4, there are several tools or tricks available to quickly verify normal operations.  I have routinely used each of these tools for many years and expect many of them to be familiar.  Many of these tools are technology-specific, meaning that one tool has an application with one technology but not another.  I should also caution that the list below is not intended to be exhaustive or complete.  It's just a collection of my thoughts on what I find really useful.

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Content Move from RouterLabPrep.com Complete

After months of deliberations, head-scratching, and careful planning, the move of all the RouterLabPrep.com content has been completed.  Thanks in no small part to the lapsing of the domain, we were able to cut through our own red tape and finally move the remaining published and draft articles.  The situation has been complicated.  Less sometimes really is more.

First, covert actions have been underway to, ahem, "redesign" this site.  Obviously, that movement by itself was complicated and consumed far more time than it ever should.  Second, additional time to move the RLP content simply wasn't available, as the domain expired before we were finished with the site redesign.  Third, running a company isn't playing World of Warcraft, though it can be mostly mindless, terribly frustrating, and sometimes rewarding.

With the timeline finally back on track, here's the short-term timeline for the site:

  • Once a month, a major article will be published.  It's important to provide relevant information and share what you know.  To that end, a new article will appear on this site every month on the 15th day of the month.  In an added twist, those articles will also start to include useful information on the new website software employed for Primacore.net (i.e. it's spelled x with MOD in front of it).
  • In between articles, content will be posted to a new section of the site not yet revealed that we'll simply call "Tips" for now.  The Tips section will house article fragments with useful information that doesn't really expand well into a full article.
  • But WAIT! There' MORE! <sigh> In the future, we are planning to introduce a newsletter which will comprise the articles and tips available here.  Think of it as a quarterly digest of the website.