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Microsoft AZ-700 completed

I just passed the Microsoft AZ-700 exam, Designing and Implementing Microsoft Azure Networking Solutions, which means I am now certified in the two major clouds (AWS and Azure) when it comes to networking. As always after an exam, I write

ddib December 29, 2022December 29, 2022 Uncategorized 4 Comments Read more

Is VLAN 1 Special in Cisco Networks?

I got asked why we change from VLAN 1 to another VLAN in Cisco networks. What is bad with the default setup? Is VLAN 1 really magical in a Cisco network? When Cisco ships a Catalyst switch to you, there

ddib September 5, 2022September 5, 2022 Layer 2 3 Comments Read more

Internet Edge IP SLA Deep Dive

It is a common design to have an internet Edge router connected to two different internet service providers to protect against the failure of an ISP bringing the office down. The topology may look something like this: The two ISPs

ddib August 22, 2022 IP services 8 Comments Read more

Modifying Maximum Throughput of Catalyst8000v

The Catalyst8000v is Cisco’s virtual version of the Catalyst 8000 platform. It is the go to platform and a replacement of previous products such as CSR1000v, vEdge cloud, and ISRV. When installing a Catalyst8000v, it comes with a builtin shaper

ddib July 5, 2022July 5, 2022 Licensing 1 Comment Read more

Modifying Administrative Distance of Specific BGP Route

In one of the Discords that I’m in there was a user with a complex network consisting of a mix of DMVPN, BGP over MPLS VPN circuits, and SD-WAN. For some prefixes, the path via the private MPLS is preferred,

ddib July 4, 2022July 4, 2022 BGP 3 Comments Read more

Using Python to Calculate Cisco SD-WAN Tunnel Numbers – Part 2

In the first post I shared with you my code to calculate tunnel numbers in Cisco SD-WAN. I’m a beginner in Python so I thought it would be a great learning experience to have someone experienced in Python, such as

ddib May 17, 2022May 17, 2022 Python 3 Comments Read more

Using Python to Calculate Cisco SD-WAN Tunnel Numbers – Part 1

When using Cisco SD-WAN on IOS-XE, it uses tunnel interfaces to configure parameters of the implementation. There is a mapping between what interface the tunnel is sourcing from and the name of the tunnel interface. For example, if the tunnel

ddib May 14, 2022May 14, 2022 Python 3 Comments Read more

Viewing a Certificate Using OpenSSL

I have started taking Ed Harmoush’s Practical TLS course to learn more about TLS and certificates. When learning about TLS, you want to inspect different certificates to see the various fields and see how different organizations use certificates differently. As

ddib April 25, 2022April 25, 2022 TLS 1 Comment Read more

My Journey to Getting AWS Certified Advanced Networking – Specialty Certified

Last week I took and passed the AWS Certified Advanced Networking – Specialty exam on my first attempt. In this post I will describe the study materials that I used and talk about my experience of taking this test. What

ddib January 31, 2022 AWS, Certification 8 Comments Read more

Getting Experience with Public Cloud

Someone reached out to me and asked how you get experience with public cloud. That’s an excellent question so I thought I would give some perspective on it. There are three ways that immediately come to mind: Studying for a

ddib December 11, 2021December 11, 2021 Uncategorized 3 Comments Read more
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Recent Posts

  • Microsoft AZ-700 completed
  • Is VLAN 1 Special in Cisco Networks?
  • Internet Edge IP SLA Deep Dive
  • Modifying Maximum Throughput of Catalyst8000v
  • Modifying Administrative Distance of Specific BGP Route

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