I'm studying for my CCNA certification and am finding myself knee deep in subnetting again - my Network+ subnetting method must've fallen out of my brain, so I'm making myself write the method down for my own future reference.
These methods are taught by Jeremy Cioara and makes the most sense to me compared to the other methods I've seen.
I highly recommend Cioara's materials on the CBTNuggets training site if you are willing to shell out the money - I'm watching all of the CCNA content in an effort to hammer the networking fundamentals into my head.
Anyways - this assumes you know how to represent base-10 numbers in base-2/binary - if not, this is probably going to make absolutely no sense. Here's my best attempt at a brief explanation:
128 64 32 16 8 4 2 1 0 0 1 1 0 0 1 050 expressed as a binary number is 110010, so we'll need 6 bits to represent it.
11111111.11111111.11111111.XXXXXX00This means that we have 2 bits left over for host addressing. Now, for the increment - this value is determined by the last network bit in the mask we just created. Our last bit lands in the 4 spot in the final octet, so our increment is 4.
Not too bad, right? I think the stockholm syndrome must be kicking in...
128 64 32 16 8 4 2 1 0 0 0 1 1 0 0 125 expressed in binary is 11001, so we need 5 bits.
11111111.11111111.11111111.000XXXXXSince we only needed 5 bits to represent our hosts, we can fill the remaining 3 bits with 1s for the network portion. This will give us a subnet mask of /27. Our increment is on the bit representing 32 in the last octet, so that's our increment.
Anyway, that's it. I'm sure I will forget subnetting again after I pass my CCNA, but at least now I have something I can look back at. In that case - hopefully I got it right!
I have the bulk of my unedited notes on this uploaded here for your reading displeasure: subnetting.txt
This weekend, Northfield hosted an Earth Day event and I, along with three other EV owners, were invited out to talk about our cars. Despite the rain, turnout was pretty good! We got to talk to a few dozen people who were curious about our experiences, and answered any questions they may have had for us.
I personally love attending these events - the people we talk to are often on the fence about purchasing an EV for their next vehicle, so letting them sit inside and interact with the car helps them to make an informed decision. Getting "butts-in-seats" is the ticket to getting people to make the switch. It certainly was for me, anyway! Once you get to floor the accelerator there's no going back.
These events are always a lot of fun - getting to meet new people and share our experiences always puts a smile on our faces!
Whew, this was a tough one. I just completed my CompTIA Security+ certification exam! I am writing this post to document my journey towards earning my bachelor's degree from WGU. I tried to cram for this exam early on and ended up almost burning myself out, so I have definitely learned to slow down and make time for leisure between multiple days of study. Shout out to Professor Messer again for the awesome free and paid content! I would not have been able to understand some concepts covered on the exam if it weren't for your videos.
This exam was a bit more difficult for me compared to either of the A+ or the Network+ exams. I understood the core concepts - but only to the level at which I taught myself during my career up to this point. There were a lot of terms that I needed to hammer the definition of into my head.
The hardest part of this exam was memorizing all of the different acronyms. I had a a modicum of experience in most of the topics the exam covers... but I had never seen some of the defintions used in the way that they were. I had seen a lot of the actual definitions, but never shorthand.
I went over every section of the CertMaster Learn and CertMaster Practice that WGU includes with this class and I was still having trouble retaining all of the information, so I bought Professor Messer's Security+ Practice Exams to ascertain my knowledge level. After I scored pretty well on the three included exams, I scheduled my certification exam.
I passed my exam and earned my certification with a score of 782/900. This was bittersweet for me - I am glad I was able to pass, but I think I will continue to study the concepts covered in this certification though since there are still some concepts I am not 100% comfortable with.
Next up, CCNA. Wish me luck!