Network+ book review pt. 2

It’s a great Friday afternoon and I’m sitting at my desk with a load of questions. It’s the same questions that I normally have to ask throughout my life but this time I’m mostly worried about passing this test and hoping to get that sys admin job. I’m not too worried about much else. Any way, sitting here at my desk killing time before I meet with my trainer at 7. I irresponsibly forgot my gym bag on Wednesday. Not sure if that cost me one of my 4 sessions this month but I would assume. Regardless, lets talk about some of this stuff from the book that I didn’t know about before I started studying.

 photo collision domains pt 1_zpskmtbrwhm.png

As previously mentioned this one is a bit confusing. Either because the question was confusing or because it is actually confusing. The thing about this is it defines a word I already understood while having no clue what a collision domain actually is. The thing about this is, studying independently, I never know if its just me or if its actually confusing. I guess I should go to YouTube:

I’m still kind of unclear but I guess I’ll move on. Honestly, the video was helpful though.

 photo broadcast domains 2_zpsejldtrhn.png

These two concepts are often lumped together and I still have no idea what’s going on here. I basically understand that its a mass sent signal but im reminded of unicast and broadcast in image deployment. You know, I realize that I could probably pass the test without really learning this stuff but if I am given the opportunity to learn CCNA stuff it might be good to have a strong baseline. So lets go to YouTube again:

Oh man, there is all sorts of stuff:

Ok, now I’m maybe starting to figure this out. I mean honestly, probably not and there’s a guy that sits behind me at work that could possibly explain this but he might also fail to verbalize it. Thats the thing about some of this stuff.

 photo csma-cd-ca 3_zpswrr8lfy4.png

Yeah, ok that’s helpful and straight forward.

 photo pdu - osi movement part 4_zps7ckafafg.png

At this point the only thing helpful here is the first definition. I have no idea how stuff moves through layers, which is asked on the test. I’m also starting to realize I like this method of independent learning using test questions and then looking back through the book to kind of hone my understand of the book and what I’m actually studying. Maybe that’s interesting. Ok, its not interesting but it is interesting to me haha

 photo vlan part 5_zpsomaszpq1.png

Conceptually, I understand VLANs but I have many questions. The questions are all based around exactly how they work but vaguely get the concept. To be honest, with server stuff, I’m fully aware of how far the rabbit hole goes and I’m willing to kind of call a stopping place. However, with VLANs, its like ‘its a logical network segment’ but clearing up the exact differences between subnets and VLANs is confusing.

This is mostly helpful but I’m not entirely sure what exactly is going on but we are getting close to a comfort zone.

 photo spanning tree part 6_zpsjwoornd7.png

I should have highlighted this one because the definition was right under the photo. I think I get the idea in that its sort of like preventing packets from being routed in a circle that goes on and on. There are also different kinds of this with newer features. That is covered in the book but I didn’t take a photo of that for some reason.

 photo DMZ part 7_zpso3dzefhs.png

This seems to be a somewhat antiquated term these days as every one is using ‘web application proxy’ to mean a DMZ. It’s for sure testable but simply making the note.

 photo ARP table part 9_zpsckcdhkwe.png

This is true but generally it has DHCP information and basically all network configuration information for a server. At least, when I’ve tried to use it. This is also helpfulARP table

 photo RIP part 10_zpsichfipc8.png

Pretty much all of this is important and I’ve seen it on the test prep questions. Given that I’ve never really seen or had to use it I’m kind of limited to how much I am aware of its existence, so its time to hit YouTube.

That’s all for now. I may go back to and do the last two sets of slides as while this is helpful it get’s tiring. Who knows. May get in the mood to do more of this type of review.

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