2022 Update: If you want a clear technical explanation of the OSI model, click on the cover of my book CCNP Enterprise Certification Study Guide: Implementing and Operating Cisco Enterprise Network Core Technologies for a free preview of Chapter 1 which explains each layer of the OSI model in intricate detail.

I …

After years of manually upgrading my self-hosted WordPress installation, I decided it was finally time to apply some devops principles (namely automation) to this process.

I decided to use AWS Systems Manager (aka SSM). I started out by creating the following Command Document (which happens to be in YAML format because …

If you’ve ever created a private hosted zone in Route 53, you may have noticed it always assigns the same name servers:

1 ns-1536.awsdns-00.co.uk.
2 ns-0.awsdns-00.com.
3 ns-1024.awsdns-00.org.
4 ns-512.awsdns-00.net.

The numbers don’t seem to be coincidental.

1536 is the RFC number for “Common DNS Implementation …

Tell them what you’ll tell them, tell them, then tell them what you told them.

This advice, although well meaning, isn't always the best approach. Although repetition has its place, repeating information three times is by no means the gold standard of teaching. I want to explore a different and perhaps more …

My latest course “Architecting for Security on AWS” is now available on Pluralsight!

You’ll learn how to secure your data and AWS services using a defense-in-depth approach, including:

• Protecting your AWS credentials using identity and access management
• Capturing and analyze logs using CloudTrail, CloudWatch, and …

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 …

Many of you have been asking for months when my Route 53 course would release. Well, it’s finally here! AWS Networking Deep Dive: Route 53 DNS is now available on Pluralsight.

Topics covered include:

• Configuring Route 53 to work with any domain name, even one registered with a different registrar
• DNS concepts and how …

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 …

In preparation for my latest course in the AWS Networking Deep Dive series, I wanted to install PowerShell Core on an Amazon Linux instance to test out cross-platform compatibility for some scripts.

Specifically, I wanted to see if I could use methods in the System.Net.Dns class to perform name resolution. The …

Most of us have tossed around the idea of restricting our social media consumption, or even giving it up altogether. It’s not that we don’t like it. We love it, sometimes too much. But inherently, something about social media just seems wrong. But what is it?

Social is Not a Neutral Tool

People often say that social …