Day16 - Linux Shell Scripting Day

Hello All!

Okay, I know shell scripting is NOT part of CCNA. So you are wondering why Day 16 I'm covering shell scripting. Well, truth to be told, having CCNA cert alone is probably going to be just the starting point of a very long journey. And if you don't know yet, there are more than just one operating system, floating around in the industry. Knowing your way around Linux and shell scripting for Linux is going to be essential for job hunting. I was highly recommended by my friends and mentors to pick up shell scripting. So on my off time away from cisco training. I'm focusing on learning the basics of linux shell scripting and hopes to be fluent in it and use them on my next job!

Before I start, I'd like to thank Madhur Bhatia and his youtube channel, which can be found HERE. He is a pretty smart guy and has various programming/scripting languages skills in which he creates tutorials for. So if you don't want to end up learning from me, go watch his videos!!!

As always, learning a new language is a long and arduous process. But knowing the steps that it takes to become fluent in it can increase the productivity of your learning. I grew up being a bilingual child and so I understand the meaning of learning a second (actual) language and what it takes to build my way to a conversational level. It will be the same for programming languages. I think Madhur nailed it when he said that the structure of the learning should be as follows:

Words
Sentences
Syntax
Paragraphs
Essays

Mastering each prerequisites will ensure the success of the next step. As I begin my journey onto Linux shell scripting, I will be documenting my learning process, compiling ppt presentations of all the commands to centralize all of my knowledge, and share it with the rest of you. Thank you all for reading my blog,

Here is the Shell Script 101 Presentation!

Day15 - Port Security

Hello! On this festive day, I'll be covering what I've learned so far about port security. This was a topic that I felt extremely weak at during my ICND 1 exam. I'm hoping to use this chance to strengthen my understanding of the types of port security and violation rules and recovery methods. Enjoy!

Day14 - OSPF Virtual Links and Authentication (Not sure what happened to day 13)

Hello! Welcome to the last day of my video training on OSPF. Today's video will cover OSPF virtual links, and also authentication. Remember that authentication errors, whether it be mis-match in password, or lack of authentication (on either side) or even the wrong type of authentication can cause neighbor relationship to break in your OSPF.

In my previous videos, I discussed the concept of an ABR. In today's video, we will talk about how to turn non ABR routers into ABR like routers by using virtual link. Virtual link is a method that we can use to connect and virtually extend Area 0. This way, if we have multiple areas that are not physically adjacent to Area 0 can have a way to connect to Area 0.

Please enjoy!

Day12 - Workflow + OSPF Multi Area Lab

Starting the day with a workflow video. Also I'll attach the follow up video talking about OSPF multi area and why it's important to setup multi- area OSPF Networks.

Thanks for watching!

Day11 - OSPF Basics - Multi-Router Single Area Network - Final part

This final video will conclude the OSPF Basics with multi-router single area setup. In this video, I've actually spent quiet a bit of time backtracking and troubleshooting an issue that was fairly obvious as well. Please comment on it if you guys think how I can make this better! Thanks!

Day11 - OSPF Basics- Multi-Router Single Area Network

Welcome back! In today's video(s), we will go into a 2 Area....actually, I can't even finish that statement. What actually is going in this lab is that we have a multi-router setup under the Area 0. Defined by and constrained to OSPF process 1. And our fifth router, BB1, is actually routed with a static path. 

I'd like to think this was a real good exercise in troubleshooting, I actually made some erroneous mistakes that, at the end of the day, I actually had to make a second, albeit short follow up videos. So enjoy!

Finally the OSPF Video(s) that I wanted to make are uploaded!

Hello!

Today I will share my first set of OSPF configuration videos (Basic configs really). The process and creation of these videos has helped me in fortifying the troubleshooting logic behind ospf troubleshoots.

Today is all about OSPF

Hello Everyone!

No videos today, but an ongoing OSPF - Open Shortest Path First video + Presentation is in the works. I'm going to link the presentation on here so others can comment on. So here it is! Video on the first section of OSPF will come tomorrow!

OSPF - All you need to know...

Day8 - Explanation of how Mac/IP addresses change when the packet's cross various devices

Hello Everyone,

So the topic on how our packet's encapsulate and de/re- encapsulates L2 and L3 headers always confuses me. It wasn't until the last blog post, where I asked myself that question and then asked the reddit/r/ccna community, where I actually got a really solid answer! Please be sure to watch my explanation and also check out the Micro CBT Nugget (the source of my learnings). I look forward to moving on with more labs!

And here is the video from the source!

Day7 - Short trip down memory lane

Hello Everyone!

No labs today, but just a short story. Also I have some complaints and questions when it comes to the exams. But here it is!

Day6 - ACL and NAT/PAT

Hello Everyone!

Day 6 video is all about creating an ACL to filter our NAT/PAT requests. I did try to do this a few times, and finally got NAT to work with ACL! I'm trying out some new IP scheme that's more friendly to what I'm doing. Also initially, I tried doing this lab without any study materials. However, I ended up forgetting that during NAT, you have to assign ports for inside and outside. So lesson learned! Here goes today's video!

Day 5 - Project DHCP server and DHCP relay

Hello Everyone!

Today's project revolves around a quick DHCP server setup on our router. From there, I looked into what would happen and how do I obtain DHCP IP releases if I'm not directly connected to the router with DHCP server setup. This is quiet an interesting and also common case i the real world. Please watch the video and let me know what you guys think of this quick project. Perhaps in the future, I will expand this topic to the IPv6 world.

Day4 - Ipv6 dualstacked with IPv4, Routing IPv6 with EIGRP

Hello Everyone, today is an exciting day. I am wrapping the IPv6 Dual Stacking over IPv4 Setup series. Well, I did run into a bit a trouble when I was setting up IPv6 on the routers. I guess I should of checked to make sure that the router I was using in Cisco packet tracer supports IPv6. It turns out that it did not! So what did I do? well, I had no choice but to start from a new set of routers and reconfigure them for IPv6.

It's a blessing in disguise really, because it gave me another opportunity to go over some configuration on the fly. Because I don't plan my recordings and configurations ahead of time, instead I do them on the fly, scenarios like that will occur fairly often. Also scenarios like this happens in the real world as well. Anyways. here goes the final set of videos!

Day3- Video 2: IPv6 Subnetting

Okay, this is definitely not my strong suit. Looks like I need to spend a little bit more time in trying to explain the conversions between Hex, and Deci and Binary. I'll most likely do another re-take on IPv6 subnetting in the very near future.

Day3 - Video 1 about Rip and No Auto Summary

Day 3 started awesome!

This video is about Rip v2 and a little information on No Auto Summary command. I've actually been done with this video for quiet a while.

We're moving onto IPv6 next, and the subnetting is giving me a very hard time in explanation. In fact, it's so difficult that I've re-recorded the explanation video twice. I will have the video up soon, hopefully.

For now, the conclusion of my IPv4 setup.

Day2 Video 2! This video quickly covers the topics we discussed previously, which is vlan/trunk setup. I also gone ahead and discussed the process of setting up router on a stick. Interestingly enough, I did not know that once subinterfaces are setup, the router will actually route packets between the vlans. I double checked the certification guide, and the official answer is as follows:

"Now that the router has a working interface, with IPv4 addresses configured, the router can route IPv4 packets on these subinterfaces. That is, the router treats these subinterfaces like any physical interface in term of adding connected routes, matching those routes and forwarding packets to/from those connected subnets" - Pg 442, Official Cert Guide, CCNA/CCENT ICND1 100-101

Okay, so after typing that out, it makes much more sense that once subterfaces are in, we can ping cross vlans!

Here goes Day2-1 video, Thanks for stopping by!

Day 2! I had quiet a bit of time to think over what I was doing yesterday, and I wanted to improve the quality and speed in which I'm making these videos. I think it's best if I try to talk about each small concept and practice video within 20 minute range. Leaving some room for questions/and ideas in the last 10 minutes. So hoping to keep each feature videos 30 minutes tops!

I ran into an issue in video 2 as you can see. While using the show interface trunk command, if your physical layer is down or the layer 2 is down. The command will respond with no answer. This was a bit troubling, but I guess it's one of the things to remember during the actual exam or out on the real world. I included a few minutes of me troubleshooting this issue, hopefully everyone doesn't get bored.

This was a real good reflection on troubleshooting techniques. You should always remember to look down the layers, making sure each protocol and it's supporting layers are working before examining the issue up the chain. In this case, my physical connections were no set, and my l2 protocol was offline. Which I guess IOS knew, and decided to tell me that if there are no connections, it won't form trunking. Well lesson learned!

Coming up, router on a stick, sub-interfaces quick video!

Here we go! Had some trouble using the correct recording software, and I had to do multiple takes. But hopefully this covers the basics!

Hello and welcome to my personal journal on the topics of basic networking. Through this series of journals I hope to record my learning and experimentation/practices towards the Cisco Certification ICND1, and eventually towards CCNA (which is what you get once you have completed both ICND1 and ICND2).

Let the journey begin...