In Part 1 of Redundancy vs. High Availability, we said that sometimes high availability and redundancy are considered to be the same thing, but we disagree. Holly and Ethan do agree that high availability can be considered a network design goal, and that redundancy is just one technique that can be used to help make... Read more »

In today’s chat, Holly and Ethan consider a question from listener Douglas who asks, “How do you approach designing a network for high availability and redundancy?” They start by defining differences between redundancy and high availability, and talk about Holly’s experience with her own customers. Then they share examples of how to achieve redundancy in... Read more »

MACsec is a protocol for encrypting Ethernet frames on a local (though not always local) network. Ethan Banks and Holly Metlitzky have an ELI5 (explain like I’m 5) discussion as to what exactly is MACsec and how it differs from IPsec. They talk about when and whether you need to implement MACsec with all the... Read more »

If you’ve ever wondered what the difference is between a Switched Virtual Interface (SVI) and Integrated Routing and Bridging (IRB), today’s show is for you! Ethan Banks and Holly Metlitzky start with some history and the basics of communication between layer 2 and layer 3 and then explain how the concepts of SVI and IRB... Read more »

The job interview is an inescapable part of a career journey. Today on N Is For Networking, we conduct a mock interview with a candidate who’s applying for a junior network administration role. The goal is to give Toni Mrowetz, our candidate, feedback. At the same time, we hope this helps anyone listening who might... Read more »

We dive back into the world of IPsec with an episode dedicated to configuring IPsec tunnels. After discussing a listener comment regarding transport mode in IPsec tunnels, Ethan Banks and Holly Metlitzky work through topics such as multi-vendor IPsec configuration, licensing, and the details of configuration and routing. Bonus material: MTU size and NAT-T. Episode... Read more »

We got some interesting listener feedback from our series on OSPF, so today’s N Is for Networking is another “Well actually” episode where we dig into that feedback. In particular, we’ll cover a defense of OSPF multi-area deployments, and dig into OSPF LSA types. Episode Links: OSPF Basics – N Is For Networking Episode 38... Read more »

We got some interesting listener feedback from our series on OSPF, so today’s N Is for Networking is another “Well actually” episode where we dig into that feedback. In particular, we’ll cover a defense of OSPF multi-area deployments, and dig into OSPF LSA types. Episode Links: N4N032 – OSPF Basics – Packet Pushers Episode Transcript:... Read more »

It’s time to talk crypto. No, not the Bitcoin kind. Ethan and Holly introduce the basics of IPsec, the protocol that authenticates and encrypts traffic between endpoints. They discuss what it is, how it provides trustworthiness and secrecy to IP traffic, and common use cases. They review the different types of IPsec protocols and modes,... Read more »

Ethan and Holly bring you the last installment of the OSPF series discussing OSPF area types. They discuss why OSPF areas exist, do a quick recap of what OSPF areas actually are, and then introduce the different types of OSPF areas.  Lastly, see if you can answer Ethan’s rapid-fire OSPF questions. Episode Transcript: This episode... Read more »