Archive for April, 2012

Networking: Blocking Access to a Website via Extended Access List [Video]

Monday, April 16th, 2012

This video demonstrates how to use an extended access list to prevent specific hosts from accessing a website. In this lab I use two Cisco 2811 routers [IOS 12.4(15)T1] and two Cisco 2950-24 switches [IOS 12.1(22)EA4]. (more…)

Twitt

Networking: Spanning Tree Protocol Basics [Video]

Sunday, April 15th, 2012

This video covers some of the basics of how Spanning Tree Protocol (STP) works in a network. To learn more about Spanning Tree Protocol see some of my prior blogs on STP. (more…)

Twitt

Algebra: Linear Equations (Coin Problem) [Video]

Sunday, April 15th, 2012

Coins
I created and uploaded this video to youtube back in 2009. This video demonstates how to solve a simple algebra coin problem. (more…)

Twitt

Chemistry: Calculate the Mass of an Atom [Video]

Sunday, April 15th, 2012

Chlorine Atom
I created and uploaded this video to youtube back in 2009. This video demonstrates how to solve a simple chemistry problem. I calculate the mass of a Chlorine atom. (more…)

Twitt

Python – Implementing Caching in Your Applications via Dictionaries

Friday, April 6th, 2012

Periodic Table of the ElementsIn this blog I demonstrate how you can implement and take advantage of caching in your Python scripts/applications.

Caching allows you to complete tasks more rapidly by storing and reusing results for repeated operations using the same criteria. For example, consider a function that takes several arguments and performs a complex calculation. What if you passed the same arguments to this function ten times; well, without caching, the same operation and complex calculation will be performed ten times. (more…)

Twitt