In a recent video discussing the “forgotten layers” of the OSI model (layers 5, 6, and 7), and my previous two videos on the OSI model, I referred to various “responsibilities” associated with each layer… Read More »The Truth about the OSI Model
Recently I’ve been working on a Practical OSPF deep dive training course on Youtube. The content of the first module is available for free on Youtube: For those of you who prefer learning by reading,… Read More »OSPF Training Course – Module 1
One of the most common Interview questions for Networking related positions involves asking a candidate what occurs in order to move data through a Network. This is a great question to ask, because it requires… Read More »“Tell me everything that happens when you type google.com into a web browser”
In an effort to continue helping CCNA candidates, I’ve taken to doing packet tracer labs on a live stream on YouTube. During the streams I will: Discuss my way through what I am configuring and… Read More »Packet Tracer labs
Supernetting is something like the inverse of Subnetting. With Subnetting, you take one Network and divide it into multiple sub-networks (subnets). With Supernetting, you are doing the opposite: you take multiple subnets and aggregating them… Read More »Supernetting, IP Aggregation, and IP Summarization
Two types of Broadcast IP addresses exist: the Local Broadcast IP address and the Directed Broadcast IP address. In the current networking world, they mostly serve the same function. But one of them contains an… Read More »Local Broadcast vs Directed Broadcast
If you’ve been doing Networking, then you are probably familiar with CIDR notation, and how it correlates to Subnet Masks and Wildcard Masks. Which means you know that a /26 correlates to a Subnet Mask… Read More »Discontiguous Wildcard Masks
If you understand Subnetting, then you probably know that the CIDR notation of /24 correlates to the Subnet Mask of 255.255.255.0. But did you also know both of those correlate to the Wildcard Mask of… Read More »Wildcard Masks