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  • Why I Don’t Teach The OSI Model

    Mar 22, 2019 Nov 25, 2022 cisco networking osi tcp/ip 2019 2022 career

    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 …

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  • AWS Networking Deep Dive Courses

    Aug 25, 2018 amazon aws cloud networking 2018

    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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  • 101 Public DNS Servers Sorted by Speed

    Mar 4, 2018 dns networking 2018

    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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  • Video: How to Subnet in Your Head

    Feb 9, 2018 cisco networking subnetting ccnp 2018

    Learn to subnet in your head in just seconds! If you like what you see, check out Cisco Enterprise Networks: Basic Networking and IP Fundamentals.

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  • Cisco CCNA Routing and Switching

    Jan 20, 2018 cisco ccnp ccna networking

    Cisco CCNA Routing and Switching learning path on Pluralsight

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  • Blockchain is a Passing Fad

    Oct 4, 2017 security blockchain networking 2017 bitcoin cryptocurrency

    Whenever a tech fad comes to an end, it becomes so obvious why it failed. Yet during the hype, it’s easy to miss the problems lurking just below the surface. I want to explore some of the problems I see with public blockchain and why I think it’s not going to live up to the hype.

    Blockchain can’t track real things …

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  • Yes, You Need IT Certifications

    Sep 30, 2017 career ccnp cisco citrix networking 2017

    Certifications are often lambasted as “worthless pieces of paper” and “experience is more important.” But for some people, certifications are more important than experience.

    A substitute for experience

    Newcomers to the IT world face the classic problem: how do you get experience without a job? Sure, you can tinker …

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  • It’s Time to Stop Using the Term Network Function Virtualization (NFV)

    Aug 25, 2017 aws cisco cloud networking virtualization 2017

    I think it’s time to stop using the term “network function virtualization”. Why? Because it doesn’t exist, at least not in the way the term suggests. The term is a category error, and when people try to make sense of the term, confusion and frustration ensue.

    Think of it like this: what’s the difference between a …

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  • Why People Haven’t Adopted IPv6 (And Why You Should Learn It Anyway)

    Jan 1, 2017 cloud humor ipv6 nat networking 2017

    If you haven’t learned IPv6 yet, well, you’re not the only one. In December 2016, IPv6 (as we know it today) turned 18 years old. Children who were in the womb when RFC 2460 was being drafted are now old enough to vote, get married, and purchase firearms in some states.

    In honor of IPv6’s 18th birthday, allow me to …

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  • New book! Learn Cisco Network Administration in a Month of Lunches

    Mar 15, 2016 cisco networking 2016

    The pre-release of my new book, Learn Cisco Network Administration in a Month of Lunches, is available from Manning Publications’ early access program.

    The book is a tutorial designed for beginners who want to learn how to administer Cisco switches and routers. Set aside a portion of your lunch hour every day for a …

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