Practical Networking .net

The Truth about the OSI Model

Ed Harmoush — Thu, 22 Feb 2024 20:44:38 +0000

In a recent video discussing the “forgotten layers” of the OSI model (layers 5, 6, and 7), and my previous two videos on the OSI model, I referred to various “responsibilities” associated with each layer of the OSI model: The truth is, all of that was a bit of a simplification. I intentionally used this… Read More »The Truth about the OSI Model

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Openssl 3.x and Legacy Providers

Ed Harmoush — Tue, 18 Apr 2023 18:42:58 +0000

Openssl v 3.0 released in Sept 2021, and one of the major changes was this one: Provider based architecture. A replacement for the old “engine” interface that enables much more flexibility and the ability for third party authors to add new crypto algorithms into OpenSSL. https://www.openssl.org/blog/blog/2021/06/17/OpenSSL3.0ReleaseCandidate/ In simpler, practical terms, this means the “old” way,… Read More »Openssl 3.x and Legacy Providers

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OSPF Training Course – Module 1

Ed Harmoush — Tue, 26 Apr 2022 21:47:53 +0000

Recently I’ve been working on a Practical OSPF deep dive training course on Youtube. The content of the first module is available for free on Youtube: For those of you who prefer learning by reading, I thought I also provide the training series in article form. OSPF is an IGP, Link State, Dynamic Routing Protocol.… Read More »OSPF Training Course – Module 1

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TLS Handshake Deep Dive with David Bombal

Ed Harmoush — Fri, 25 Mar 2022 17:18:26 +0000

Recently, I had the honor of talking to David Bombal about the TLS Handshake. We picked apart everything that occurs in the first few milliseconds every time you browse to an HTTPS website: In the video we stepped through every message of the Handshake, and spoke in detail about what information is included in each… Read More »TLS Handshake Deep Dive with David Bombal

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Cisco 2021 IT Blog Awards – Winner =)

Ed Harmoush — Wed, 23 Mar 2022 03:40:38 +0000

Back in January, I announced that my blog was selected as a finalist for Cisco’s 2021 IT Blog Awards. I’m happy to report that because of you, Practical Networking was voted into the Top 5 to attain the prestigious honor of of being a Winner for 2021 in the IT Blog Category: I’m not sure… Read More »Cisco 2021 IT Blog Awards – Winner =)

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Cisco 2021 IT Blog Awards – Finalist

Ed Harmoush — Tue, 11 Jan 2022 20:37:19 +0000

I’ve been selected as a finalist for Cisco’s 2021 IT Blog Awards =). The award seeks to recognize blogs that provide Value, Credibility, and Consistency. When I first set out to create a blog, I set a mission statement of writing articles that bridge the gap between overly entry level (and not enough detail) and… Read More »Cisco 2021 IT Blog Awards – Finalist

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RSA, Diffie-Hellman, DSA: the pillars of asymmetric cryptography

Ed Harmoush — Fri, 03 Dec 2021 18:38:45 +0000

The world of modern cryptography is built upon the concept of Asymmetric Encryption, and the pillars of Asymmetric Encryption are these three algorithms: RSA, Diffie-Hellman, and DSA (Digital Signature Algorithm). But unfortunately, there are many misconceptions about these algorithms, and about Asymmetric Cryptography itself. In this article, we’re going to look at each of these… Read More »RSA, Diffie-Hellman, DSA: the pillars of asymmetric cryptography

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“Tell me everything that happens when you type google.com into a web browser”

Ed Harmoush — Wed, 15 Sep 2021 16:05:03 +0000

One of the most common Interview questions for Networking related positions involves asking a candidate what occurs in order to move data through a Network. This is a great question to ask, because it requires understanding all the fundamental working parts of how data moves through the Internet. I’ve interviewed hundreds of candidates. And I’ve… Read More »“Tell me everything that happens when you type google.com into a web browser”

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Packet Tracer labs

Ed Harmoush — Fri, 06 Aug 2021 00:02:53 +0000

In an effort to continue helping CCNA candidates, I’ve taken to doing packet tracer labs on a live stream on YouTube. During the streams I will: Discuss my way through what I am configuring and why Show you how to use show commands to quickly troubleshoot Validate the device configuration as well as it’s operation… Read More »Packet Tracer labs

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Practical TLS – Free SSL Training – Module 1

Ed Harmoush — Thu, 08 Jul 2021 22:00:46 +0000

Recently, I published a full SSL training course which is a comprehensive, deep dive into SSL and TLS — the protocols which secure the Internet. I want people to see the quality of the content within the course, so I’m planning to release free previews of some of the lessons. Over the next few weeks,… Read More »Practical TLS – Free SSL Training – Module 1

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