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
Continue Reading →Here is a great side by side comparison of IPv4 and IPv6. This is a handy guide for anyone taking A+ or Network+, or another networking certification such as the CCNA or CCNP.
From Rick Petrucci on Pinterest
In a local area network for a typical business network, the DNS resolvers that would be the first used by computers on the network would be placed behind a firewall inside the LAN, or in a DMZ. If necessary, DNS resolution would be passed up the hierarchy until a server is found that has the answer.
A quick Saturday digest of cybersecurity news articles from other sources.I finally figured it out. For those who are having a hard time trying to figure out the network, first/last host, broadcast, next subnet, and number of addresses in a subnet, ...
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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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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 ...
Continue Reading →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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A quick Saturday digest of cybersecurity news articles from other sources.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 ...
Continue Reading →A quick Saturday digest of cybersecurity news articles from other sources.The Social Security Administration will never threaten, scare, or pressure you to take an immediate action.
If you receive a call, text, or email that…
A quick Saturday digest of cybersecurity news articles from other sources.
Today is the 20th anniversary of a day that I will never forget. I was driving home after dropping my son off at school, and listening to the KQRS Morning Show with Tom Barnard on the radio when ...
