Following are free resources that I've created or collected. Articles by me Networking Web-scale: a healthy choice for healthcare networks Automating Cumulus Linux with Ansible 5 Network automation tips and tricks for NetOps Top 5 tips for transitioning to 100G networking 5 big misconceptions about virtual LANs IT …

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CCNP Enterprise Certification Study Guide: Implementing and Operating Cisco Enterprise Network Core Technologies: Exam 350-401 The practical and conceptual knowledge you need to attain CCNP Enterprise certification. Click the book to view on Amazon. For errata, click here. AWS Certified Solutions Architect Study …

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You took one of the Cisco CCNP exams. You went to the exam center, sat down, and started the exam. About 2 hours later, you saw the dreaded news appear on the screen: You didn’t pass. I’ve failed certification exams in the past, so I can relate to the facepalm-worthy feeling you get when you realize you dropped a …

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January 31, 2020 update: No, you're not crazy. Cisco changed the exam number from 300-401 to 350-401. For your convenience, I've put together the following list of my Pluralsight courses that cover the new CCNP ENCOR exam. By watching and following along with the hands-on demos in these courses, you can't go wrong. …

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While playing around with AWS CloudWatch Log Insights to analyze VPC flow logs, I thought of a couple of fun ways to identify (probably) malicious traffic. Finding Vulnerability Scanners These are the guys that hammer your box looking for anything from silly SQL injection attacks (so 2005) to CSRF vulnerabilities. The …

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I recently got an email from a viewer of my Practical Networking course who asked how the TCP/IP networking terms I used mapped to the Open Systems Interconnect (OSI) model. First, a bit of background. The OSI model is a generic networking model that is supposed to describe conceptually how networks carry data. Within …

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Puzzled by networking on AWS? Check out my AWS networking deep dive series! AWS Networking Deep Dive: Route 53 DNS Configure Route 53 for any domain name, and configure health checks and routing policies.  AWS Networking Deep Dive: Virtual Private Cloud (VPC) Create secure and scalable VPCs. Implement multi-VPC …

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You probably know the popular Google DNS server IP addresses by heart: 8.8.8.8 and 8.8.4.4. Before those were around you might have even used Level3’s 4.2.2.1 and 4.2.2.2. Of course, everyone else uses these too, which means these popular servers are under a pretty heavy load. Fortunately, there are faster public DNS …

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