12 Essential TCP Concepts Explained Simply — A Must‑Watch Deep Dive for Networking Pros

The video breaks down the Transmission Control Protocol (TCP) into 12 clear, digestible ideas that help viewers truly understand how data reliably moves across the internet. Instead of overwhelming you with jargon, it walks through each concept—like Sequence Numbers, Acknowledgment Numbers, and Window Size—in a way that feels intuitive and practical. Whether you're a student, a network engineer, or someone brushing up on fundamentals, this guide makes TCP’s inner workings feel accessible and even enjoyable.

Why "It's Probably the Cable" Should Send You to the Field

Every network tech has said it at least once: "It's probably the cable." And every network tech has also, at least once, been dead wrong about which cable, why, or how. If you've ever spent forty-five minutes staring at a switch port graph trying to divine the future from a packet loss chart, this one's for you. Nothing — and I mean nothing — replaces walking to the actual jack, patch panel, or connector and looking at it with your own two eyeballs. Due to recent advancements in technology you can do this remotely over a video call, i do it all the time.

The Lightning‑Bolt Express: When LapLink Ruled the Earth

Long before cloud storage, Wi-Fi, and services like OneDrive made moving files between computers almost effortless, there was LapLink. For many PC users, LapLink was one of the simplest ways to connect two computers and transfer files, folders, and settings. The software became especially popular during the DOS and early Windows era, when networking two PCs could be far more complicated than it is today. What looked like a simple yellow cable and a piece of software was actually a clever solution to a very common technical problem: how do you get data from one computer to another without a network?

Nine PBS’ 50TB Data Disaster: How 70 Years of TV History Got Trapped in the Cloud

Nine PBS in St. Louis has found itself dealing with a nightmare scenario for anyone responsible for long-term data storage: the data apparently still exists, but the organization can't access it. The public television station is fighting to recover more than 50 terabytes of archival material representing roughly 70 years of programming and regional history. The archive includes coverage of major events such as the Great Flood of 1993, the COVID-19 pandemic and the history of East St. Louis. The problem began when Nine PBS's cloud-storage provider, Open Source Storage (OSS), apparently ceased operations and stopped responding to the station. (link)

How to Configure Port Mirroring on a Ubiquiti EdgeSwitch Using a Simple Trick

Port mirroring is one of those networking features that sounds simple in theory but can be maddening to actually locate on a Ubiquiti EdgeSwitch. If you've ever opened the modern web GUI looking for a mirroring option and come up empty, you're not imagining things — the feature is tucked away behind the "Legacy Interface" toggle rather than sitting in the main dashboard where you'd expect it. Once you know to make that 'switch', configuring a mirrored port takes just a couple of minutes, but without that knowledge you can spend a frustrating amount of time clicking through menus that simply don't have what you need.

Connected to Wi-Fi But No Internet? How a Simple Cable Inspection and Link Test Solved the Mystery

One of the most common complaints network technicians hear is, "I can connect to the Wi-Fi, but I don't have internet access." While it's tempting to immediately start checking DHCP, DNS, VLANs, or wireless controller settings, the fastest path to the solution often begins with something much simpler: a careful physical inspection. In this troubleshooting video, I demonstrate why following a structured methodology is so important and how taking a few extra minutes to examine the hardware can save hours of unnecessary investigation.

Network Troubleshooting Quickstart

Whether you're dealing with a dropped WiFi connection, a switch that won't pass traffic, or a router that seems fine but isn't, knowing where to start is half the battle. In this fast-paced 90-second breakdown, I walk you through some ideas, layer-by-layer troubleshooting method — avoid guesswork, rebooting everything or blindly repacing equipment and hoping for the best. From the physical cable all the way up to DNS resolution, this video gives you a repeatable framework you can apply every single time your network goes down.

Your Smartphone vs. a 1985 Supercomputer: How a Cray-2 Loses to the Phone in Your Pocket

In 1985, the Cray-2 was the fastest computer on Earth — a liquid-cooled, room-sized beast that cost as much as a small hospital and hummed away at a blistering 1.9 GFLOPS. Fast forward to 2026, and the iPhone 16 Pro in your back pocket casually clears 2,000+ GFLOPS of FP32 compute. That's not a typo — your phone is roughly 1,000 times faster than what NASA and top research labs once fought over allocation time for. The Galaxy S25 Ultra pushes even further, hitting 2,500–3,500+ GFLOPS, making it up to 1,800 times faster than Seymour Cray's masterpiece. The supercomputer that once simulated nuclear tests and weather patterns for entire governments now loses a flat-out compute race to a device you use to scroll memes at breakfast.

Using Wireshark to Analyze PowerShell Test-Connection

If you’ve ever run PowerShell’s `Test-Connection` command and wondered what is actually happening on the network, Wireshark is the perfect tool to answer that question. Test-Connection looks simple from the command line, but does it generate ICMP echo requests, use TCP or UDP to figure out latency, packet timing, routing, and connectivity. In my video, I walk through the exact process of capturing this traffic with Wireshark and using a capture filter to isolate only the packets from the target device, making the analysis much easier to follow.

Why Layer 1 Troubleshooting Matters: Using a NetAlly LinkRunner to Catch Cabling and RJ45 Connector Issues Before They Cost You Hours

When a network problem shows up, it's tempting to jump straight to software configs, IP addressing, or switch settings. But skipping the physical layer is one of the most common — and costly — mistakes in network troubleshooting. Layer 1 is the foundation everything else rides on: if a cable is damaged, a connector is loose, or a termination is faulty, no amount of software-level troubleshooting will fix the real problem. Starting at Layer 1 means you're validating the actual physical path before assuming the issue lives somewhere more complex.

Why Every Tool Deserves a Test Drive

One of the most valuable habits a technician can develop is spending time with their tools before relying on them in the field. Too often, we unbox a new tester, glance at the quick-start guide, and assume we understand what the results mean. The reality is that every diagnostic tool has its own quirks, display conventions, and interpretation methods. Taking the time to connect a tester to known-good networks, cables, and devices creates a baseline of understanding that becomes invaluable when troubleshooting real problems later.

A perfect example came while experimenting with an older NetAlly LinkRunner G2. I connected the tester to a cable and switch port that I knew were working properly and expected to see a clean, uneventful result. the additional goal for me was to see how an older tool behaved with newer equipment. Instead, the cable screen displayed information that initially looked concerning, including indications that could easily be mistaken for faults by someone unfamiliar with the tool's reporting methods. Had this been encountered for the first time during a customer outage, it could have led to unnecessary troubleshooting, confusion, or even misdiagnosis.

Think You Know Tech? Take the Quiz and Win a $50 Amazon Gift Card!

Have you ever shouted an answer at your computer screen and thought, “I should be getting paid for this!”? Well, now’s your chance. I’m hosting a fun tech quiz over at The Tech Firm Giveaway, and one lucky participant will walk away with a $50 Amazon gift card. That’s right — your random knowledge of gadgets, networking, computers, and tech trivia could actually buy you something useful… or at least something shiny. Oh yes, and the odd scavenger hunt.

AI-Designed Viruses: What Stanford's Breakthrough Really Means for Cybersecurity, Science and Biosecurity

Scientists at Stanford University, working with the Broad Institute of MIT and Harvard and the Arc Institute, have achieved what researchers call a first in synthetic biology: using generative artificial intelligence to design entire, functional viral genomes rather than just individual genes or proteins. Led by chemical engineer Brian Hie and bioengineering graduate student Samuel King, the team used a genome language model called Evo 2, which was trained on DNA the way large language models are trained on text. Genome language models are trained on large corpora of DNA comprising millions of genomes from all domains of life, which enables them to learn the evolutionary constraints that shape DNA sequences in nature. 

Until now, that ability had never been tested at the scale of a complete genome, making this the first peer-reviewed demonstration of its kind, published in the journal Science.

HTTP Gets a New Method: What You Need to Know About QUERY

 

If you’ve spent years working with web applications, APIs, and load balancers, you’re probably used to the classic HTTP verbs: GET, POST, PUT, DELETE, and a few others. In 2026, the IETF officially added a new method called QUERY, and it’s a bigger deal than it sounds. 

F5 recently published guidance explaining how BIG-IP LTM and Advanced WAF handle QUERY traffic, and it’s worth paying attention because this change affects application delivery, caching, logging, and security policies. The new method was standardized in RFC 10008 and is now part of the official HTTP specification.

CCNA Introduction to Networks: Why This Free Cisco Course Is the Best Starting Point for Your Networking Career

If you've ever wanted to break into IT but got overwhelmed by the alphabet soup of networking acronyms, Cisco's CCNA: Introduction to Networks course (via Networking Academy) is where you stop guessing and start understanding. This is the first of a three-course CCNA series, and it's built to take you from "what even is a subnet?" to actually configuring routers and switches with confidence. It introduces the architectures, models, protocols, and networking elements needed to support operations for anything from Fortune 500 companies to small retailers. No prior experience required — you just show up ready to learn.

Why Physically Inspecting Outdoor Network Connectors Can Save Hours of Troubleshooting

When it comes to network troubleshooting, nothing beats a good physical inspection. It's easy to jump straight into configuration settings, switch logs, or packet captures, but many network problems are caused by something much simpler—a damaged or deteriorating connector. In this video, I take a close look at an outdoor RJ45 female connector that initially looked acceptable from a distance. Once I examined it more closely, however, the contacts showed signs of oxidation and corrosion. That small detail can have a surprisingly large impact on network performance and reliability, especially when the connector is exposed to the elements year-round. Heres a better option

Thank You to our new sponsor - Packet Guru

I'm personally excited to welcome Packet Guru as a sponsor of LoveMyTool and Networkdatapedia, and want to take a moment to say a genuine "thank you". Packet Guru has spent decades helping organizations get the network visibility they need — from forensic packet analysis to tap and packet broker deployments as an authorized Profitap reseller — and that expertise fits right in with the kind of practical, in-the-trenches content our readers come here for. Sponsors like Packet Guru are exactly why this blog has been able to keep going strong since 2007.

For anyone wondering what a sponsorship actually gets a company like Packet Guru, the short answer is: real, sustained visibility in front of the people who make network purchasing decisions. Their logo now sits directly on our front page with a live link to their site, and they're guaranteed placement of their technical articles and videos at least twice a month — not buried among a pile of rotating banner ads, but front and center where our readers already expect to look. That kind of standing presence, rather than a one-off campaign, is a big part of what makes sponsorship here valuable.

Why Outdoor-Rated Ethernet Cable Is Essential for Reliable Outdoor Networks

When extending a network outdoors, choosing the right Ethernet cable is just as important as selecting the right switch or wireless equipment. It can be tempting to use leftover indoor Cat5e or Cat6 cable to save money, but that shortcut often leads to premature cable failure and costly repairs. In this video, I explain why outdoor-rated Ethernet cable is designed specifically to withstand harsh environmental conditions and why it's one of the smartest investments you can make for any outdoor network installation.

Can AI Really Be Trusted in Enterprise IT Operations?

If you’ve been following the AI hype in enterprise IT, you’ve probably noticed a recurring theme: lots of excitement, but not a lot of trust. A recent article from AI Magazine discussing NETSCOUT’s research highlights that many IT operations teams are still hesitant to rely on AI for day-to-day troubleshooting and network management. The biggest concern isn’t whether AI can generate answers—it’s whether those answers are accurate enough to use during a real outage or performance incident. In environments where downtime costs money, “probably correct” is not good enough.

Wireshark LLDP and CDP Capture: Use it for Network Discovery and Troubleshooting

If you're troubleshooting a network and you're not using Wireshark to look at LLDP and CDP packets, you're potentially missing some incredibly useful information. Link Layer Discovery Protocol (LLDP) and Cisco Discovery Protocol (CDP) are designed to help network devices identify their neighbors, and Wireshark lets you see exactly what those devices are advertising. Instead of relying entirely on switch management interfaces or guessing which device is connected to which port, you can capture the Layer 2 discovery traffic and inspect the information packet by packet. This can be particularly valuable when documenting an unfamiliar network or troubleshooting a connection where the switch configuration doesn't tell the whole story.