From the web - Chris Greer and Dont Break DNS

Dive into the often-misunderstood world of DNS with **“Don’t Break DNS!! // Lesson 2”** from networking expert Chris Greer. While many assume DNS runs exclusively over UDP, this eye-opening episode in the "How DNS Works" series reveals the critical role TCP plays when responses grow too large for UDP packets. Using real-world examples and Wireshark packet captures, Chris demonstrates exactly what happens when a UDP reply gets truncated (the infamous TC flag), forcing the client to retry over a TCP connection. Whether you're troubleshooting mysterious resolution failures or simply want to deepen your understanding of core internet protocols, this lesson delivers clear, practical insights backed by key RFCs like 1123 and 5966.

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Free Webcast = Capture the Packets That Matter and Analyze Them Like a PCAP Pro

 

Chris Greer, Chief Packet Head, Packet Pioneer 

& 

Ward Cobleigh, Sr. Product Line Manager, VIAVI Solutions

In today’s data-driven networks, the ability to capture and analyze the right packets is what separates guesswork from true operational insight. The webcast “Capture the Packets That Matter and Analyze Them Like a PCAP Pro” delivers 45 minutes of actionable techniques designed for network engineers, security analysts, and IT professionals who want to go beyond basic packet dumps and extract real value from PCAP files. Hosted on BrightTALK’s leading B2B learning platform — trusted by millions of professionals worldwide — this talk blends expert guidance with practical demonstrations you can apply immediately.

Two Top Practitioners, One High-Impact Session

This webcast brings together Chris Greer, a renowned Wireshark expert (“Chief Packet Head”), and Ward Cobleigh, Senior Product Line Manager at VIAVI Solutions, for a deep dive into packet capture best practices. Chris breaks down his systematic approach to packet analysis, including his top filters and review techniques to help you sift through large captures with confidence. Ward then complements this with insights into advanced analysis workflows, showcasing how purpose-built tools can accelerate root-cause isolation and performance troubleshooting in complex environments.

Learn Faster and Troubleshoot Smarter

Whether you’re just getting started with packet capture or you’re looking to sharpen your existing skills, this webcast delivers practical strategies and expert tips that make PCAP analysis less daunting and much more productive. Attendees will walk away with clear steps to improve their packet troubleshooting work today — and the confidence to tackle even the toughest capture files with precision.

Engage with a Growing Network of Professionals

Presented on BrightTALK — a premier destination for B2B webinars and virtual learning that connects industry professionals with trusted expertise across technology and business topics — this webcast also gives viewers access to a community of like-minded peers and additional expert talks focused on network performance, cybersecurity, and operational excellence.

. https://www.brighttalk.com/webcast/20528/642458

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from the web: Free Cyber Security Course with Certificate

Here’s a review and promotional overview of the Introduction to Cyber Security course on Great Learning Academy:

The Introduction to Cyber Security course offered by Great Learning Academy is a solid starting point for anyone curious about how digital systems stay secure in an increasingly connected world. It’s a beginner-level, self-paced online course that sits at roughly 3.75 hours of learning time and has already attracted 230,000+ learners — signaling strong interest. The curriculum introduces foundational topics like cyber security fundamentals, types of cyber attacks, cryptography, risk assessment, and secure system design, all framed in an accessible way that doesn’t assume prior professional experience. There are built-in quizzes and case studies to reinforce learning, and while the core content is free to access, you can choose to pay a certificate fee upon completion to showcase your achievement on platforms like LinkedIn or your resume. 

Master DNS Basics Fast with Chris Greer

In this engaging video, networking expert Chris Greer takes viewers on a hands-on journey through the fundamentals of DNS (Domain Name System). Starting with the basics, he explains how DNS acts as the internet's phonebook, translating user-friendly domain names like wireshark.org into machine-readable IP addresses. Using simple tools like the nslookup command and Wireshark for packet capturing, Greer demonstrates a real DNS query in action, breaking down the four key packets involved: the initial UDP query to the resolver and the response with resolved IP addresses. He dives into essential details such as transaction IDs for matching requests and responses, recursion flags, and TTL (Time to Live) values that keep resolutions fresh in a dynamic online world.