Cert Week – IPv4 Subnetting and Supernetting

I have just finished teaching a couple of CompTIA  Network+ classes.  One of the subject matter areas that most students struggle with is the concepts around Subnetting, Supernetting, Variable Length Subnet Masking (VSLM), Fixed Length Subnet Masking (FLSM), Classless Interdomain Routing (CIDR),

I recently found this collection of ten videos presented by 

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Networking Protocols for Certification

By Bob Weiss and ChatGPT

Learning about networking protocols, and their importance and uses in the communications between two computers across some sort of network media, is at the center of many IT and cybersecurity certifications.  The goal of this article is to provide a list of networking protocols that you need to know for your exam and for a future career in ...

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URL Encoding, SQL Injection, and Directory Traversal for Cybersecurity Certification – Part 1

Numbering Systems

By Bob Weiss

Many of the cybersecurity certifications that I teach have content that involves the uses of encoding, code injection, directory transversal, and scripting.  These concepts can be difficult to grasp, and the exam questions can be challenging to answer correctly.  This series of articles is designed to help you understand the basic concepts, and how these get used both securely and maliciously.  I am planning to show examples to help you identify these types of use cases or ...

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Ports and Protocols

As you know from taking my classes, computers prefer numbers and humans prefer letters or words.  Port numbers are numerical placeholders for protocol names.  The best way to learn them is through daily professional use, or memorization.  Flash cards can be helpful if you are preparing for an exam that is heavy in ports and protocols, such as the CompTIA A+ or Network+.

Here is another study aid provided by Rich Muldoon.  Click on the image to enlarge to full size ...

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Weekend Update

A quick Saturday digest of cybersecurity news articles from other sources.


NSA Releases Network Infrastructure Security Guidance

Original release date: March 3, 2022

The National Security Agency (NSA) has released a new Cybersecurity Technical Report (CTR): Network Infrastructure Security Guidance. The report captures best practices based on the depth and breadth of experience in supporting customers and responding to threats. Recommendations include perimeter and internal network ...

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