N Is For Networking - Packet Pushers

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N4N037: IPsec Basics

Épisode 37

jeudi 28 août 2025 • Durée 58:11

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 »

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N4N036: OSPF Area Types

Épisode 36

jeudi 14 août 2025 • Durée 01:08:51

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 »

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N4N035: Well Actually . . . Listener Comments and Corrections

Épisode 35

jeudi 31 juillet 2025 • Durée 46:35

We ask listeners for follow up and you’ve sent it in. On today’s show we respond to listener comments and corrections on tunneling, the link aggregation control protocol, link aggregation in general, and DHCP options. We also talk about the network engineering certification journey. If you’ve got a “Well, actually” or any other follow up,... Read more »

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N4N034: OSPF Network Types

Épisode 34

jeudi 24 juillet 2025 • Durée 43:10

Ethan and Holly continue their OSPF journey this week with OSPF Network Types. They discuss the two main OSPF network types used today: the broadcast and point to point networks. They also explain designated routers, backup designated routers, and when those are used and why. Lastly they discuss some soft skills – knowing your vendor... Read more »

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N4N033: OSPF Neighbor Formation and Timers

Épisode 33

jeudi 17 juillet 2025 • Durée 56:52

Our OSPF series continues with a look at OSPF neighbor formation and related timers. We talk about the five major packet types that carry information among OSPF routers, how OSPF routers become neighbors, how they negotiate link-state database exchanges, keep-alive messages, and how they negotiate designated and backup routers when multiple devices are on the... Read more »

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N4N032: OSPF Basics

Épisode 32

jeudi 26 juin 2025 • Durée 56:47

By popular request (and now that we have some other background topics covered) we start our series on the Open Shortest Path First (OSPF) routing protocol. We kick off the series with OSPF basics including Link State Advertisements, Link State Database, and other related essentials. We’ll explore additional OSPF topics over subsequent episodes. This week’s... Read more »

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N4N031: When Is It Time For a Routing Protocol?

Épisode 31

jeudi 19 juin 2025 • Durée 54:39

If you need to route in your network, you can program static routes into all your routing-capable devices. And this can work. But at some point, you’re probably going to want to switch to a dynamic routing protocol. On today’s N Is For Networking, Ethan and Holly discuss the differences between static and dynamic routes,... Read more »

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N4N030: Network Shapes and Sizes

Épisode 30

jeudi 12 juin 2025 • Durée 01:03:06

What shape is your network? In other words, what is its topology? On today’s episode, we discover the different types of network topologies and designs used in the enterprise, data center, and service provider networks. We cover leaf/spine, hub and spoke, point to point, mesh, and others. We also talk about how topologies affect traffic... Read more »

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N4N029: Four Goals of Network Design

Épisode 29

jeudi 5 juin 2025 • Durée 01:04:17

Let’s explore four goals of network design: stability, speed, scalability, and security. These goals are based on Ethan’s experience designing, building, and operating networks. Network architects and design experts might have other objectives, and that’s fine, but these four goals are the basis of today’s episode. Ethan and Holly discuss why these four goals are... Read more »

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N4N028: The Wide World of WANs

Épisode 28

jeudi 29 mai 2025 • Durée 01:01:13

We wanted to do an episode on SD-WAN, but realized we needed to set the stage for how wide-area networking developed. That’s why today’s episode is a history lesson of the Wide Area Network (WAN). We talk about how WANs emerged, public and private WANs, how WANs connect to LANs and data centers, the care... Read more »

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