This lab session I will be configuring and reviewing all aspects of Site to Site VPN configuration! Will be going through a refresher on pretty basic VPN Configuration including the following topics: Define and configure the Phase 1 and Phase 2 settings for IPSec VPNCrypto Map configuration to define correct "interesting traffic"Configure different NAT statements … Continue reading Cisco ASA Lab – Site to Site IPSec VPN Tunnel Configuration, with explanation of all configs, common VPN Issues / Troubleshooting tips!
This side is long overdue for an ASA "quick reference guide" for configurations, so here it is! Before diving head first into brand new studies I wanted to create a bottom up config demo of ASA firewalls for reference when needing to configure or troubleshoot ASA issues, I will give some brief explanations of concepts … Continue reading Cisco ASA lab – Configuring the ASA at Site B with Security Zones / DHCP / ACLs / PAT / Static NAT with explanation along the way!
After assessing how big a leap I had taken forward going into ACI, I am reeling it back to NX When digging into ACI further it became apparent that I had taken a huge leap over some foundations that comes before it like just learning to work with API Configuration on Nexus switches in general, … Continue reading CCNP Data Center – Setting up a Nexus / ASA CML 2.0 Lab, review of API Documentation in CML, and how to use it to work within Postman!
DevNet Sandboxes are an amazing resource, I really encourage you to check them out if you haven't! What is shown above is a "Reserved" Sandbox for ACI in which there are a few things in the Topology: ACI_Simulator - This is the APIC, 1 Spine Switch, and 2 Leaf Switches in a single pod / … Continue reading CCNP Data Center – ACI Lab in DevNet Sandbox (great resource!), ACI Fabric Configuration via APIC Web GUI – Will be adding different config methods (API, CLI) soon!
Putting Multicast labbing on pause to hit Nexus 9K series / ACI / SDN studies and lab it up! After a slight hiccup in continuing on with Multicast studies, I've decided to table that to learn the Cisco Nexus 9000 Data Center switching hardware platform and ACI Software that runs on it, as going back … Continue reading CCNP Data Center – Intro to Nexus 9K Switches and ACI Fundamentals and Design concepts, terminology, then on to DevNet Sandbox labbing!
The "Breakout Tool" in CML allows you to use Putty and VNC to control lab devices, but it is risky to config! The CML 2 VM labbing environment opens devices in a rather rigid and difficult to work with embedded console window like you would see in a DevNet learning lab on developer.cisco.com, fortunately they … Continue reading CML 2 Breakout Tool Configuration for Windows 10 – Step by step guide on how to enable using Putty / VNC outside of CML 2 (hooray for Putty)!
Why does this Topology not look like it was made in MS Paint? Because I am using CML to lab! After trying to NAT, NAT, and then NAT traffic in and out of GNS3 to generate Multicast traffic into my previous Topology the time I spent troubleshooting the lab outweighed the study time - So … Continue reading Multicast Routing – IGMP, PIM, Multicast Trees, PIM Sparse-Mode, PIM Dense-Mode, Multicast Discovery methods to wrap it up!
Above is a Topology I created for Multicast Routing, however I've found in digging into Multicast that I will need to add some LAN segments to really demonstrate behaviors of different Multicast configuration, so this will cover the fundamentals of Multicast before hitting the lab to get our hands dirty! Why we need Multicast Routing … Continue reading Multicast Fundamentals – What Multicast routing achieves, IGMP Versions, Layer 2 mechanisms, and Multicast Address blocks to know!
I haven't got my score confirmation email yet, but I'm not waiting to celebrate! I will replace the #devnet2020 logo with a passing score to add to the wall of exam passes once I get the official email, but I did indeed pass with a score of 930/1000 today, and I must say that being … Continue reading DEVASC crushed today (12/18/20) with a score of 930 / 1000 – What a feeling of accomplishment and unique skillset to be recognized for!
First DEVASC exam attempt is a swing and a miss THIS attempt! I regret to POST that my first attempt at the DEVASC fell short of the passing grade, the questions were very fair and spread out evenly I felt across all domains, there was just some domains I couldn't cover as much as I'd … Continue reading DEVASC Attempt #1 – A swing and a miss! Came very close, feel good about how much I had down, and know what I need for attempt #2!
(This is not my official DevNet Associate exam results, at least not quite yet!) This practice exam included with the DevNet OCG is amazing for last minute review! 900/1000 was the score of my 2nd practice exam attempt today, I don't mean to misrepresent my initial score of 750/1000 on my first attempt out of … Continue reading DevNet OCG – Includes a practice exam that is worth its weight in gold for exam day preparation!
Time to pull out all the stops and make some online DEVASC Flash Cards! 🙂 After enough review I have concluded that small details get lost in putting together the entire picture of DEVASC Topics, and if I get asked some obscure Status Code Response # on exam day that are easy points, these flash … Continue reading DEVASC Online Flash Cards – All Topics that have glaring details begging to be asked on exam day will be posted here! More to come!
This will cover most things REST API at the fundamental level needed for the DEVASC, some items / tools not entirely clear here should be independently reviewed, as this article is long enough with me doing a full screenshot walkthrough of Postman REST API Tool 🙂 With that, lets get this party started! What an … Continue reading DEVASC REST API Deep Dive – API Types / Methods / Status Codes / Headers / Pagination / Rate-Limit / Tools / Python Scripted REST API Calls – Easy points on exam day!
Kaboom - And then there was APIs! Lets get right into it and get this DEVASC passed!!! 🙂 Northbound vs Southbound APIs, Synchronous vs Asynchronous, Authentication types! API (Application Programming Interfaces) allow Applications to talk to software to perform various tasks (configure / read / delete resources), the most common of these for DevNet exam … Continue reading DEVASC Quick Notes – Northbound vs Southbound API, Async vs Sync, REST API Basics, HTTP and CRUD Verbs, SOAP API, RPC reviewed!
This will be the finishing "Python" focused article, and I will keep it brief! Above is a jump all the way to the bottom of this post for "Unit Testing" which will be gotten to quick, but I kind of stumbled around trying to understand how to do it from Bash Shell, but eventually just … Continue reading DEVASC Python – Error Handling in Python, Test Driven Development (TDD), and Unit Testing reviewed!