CCNA Recap: Wide Area Networks

(More like CCENT Recap)

point to point
* can be physical
* can be logical
* typically layer 2
* connect lans to service providers

hub and spoke

spoke
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hub ———— spoke
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spoke

- cost effective
- could have suboptimal paths
- hub is a single point of failure
- make sure they never become DR or BDR
- reduce priority to zero

Full Mesh

* redundancy
* everyone is connected to everyone else
* does not scale well
* optimal pathing
* higher expense
* you could make it partial mesh!

Single homed
- connection to a single ISP

Dual Homed
- you are connected to a single ISP with more than one link

Split Horizon
If you receive information in one interface, don’t send it out that same one.

EMPLOYERS: This is me reviewing information I have been tested on and passed in the ... past.

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Securing Terraform and You Part 1 -- rego, Tfsec, and Terrascan

9/20: The open source version of Terraform is now OpenTofu Sometimes, I write articles even when things don't work. It's about showing a learning process. Using IaC means consistency, and one thing you don't want to do is have 5 open S3 buckets on AWS that anyone on the internet can reach. That's where tools such as Terrascan and Tfsec come in, where we can make our own policies and rules to be checked against our code before we init. As this was contract work, I can't show you the exact code used, but I can tell you that this blog post by Cesar Rodriguez of Cloud Security Musings was quite helpful, as well as this one by Chris Ayers . The issue is using Rego; I found a cool VS Code Extension; Terrascan Rego Editor , as well as several courses on Styra Academy; Policy Authoring and Policy Essentials . The big issue was figuring out how to tell Terrascan to follow a certain policy; I made it, put it in a directory, and ran the program while in that ...

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