This is going pretty good, learning some new stuff. Realizing that I should probably re-read some of the stuff I read while understanding that the last post was mostly just slightly different Network+ material and that I’m expecting this to be much harder. I never really thought that I would be able to get any Cisco cert when I got my first cert on Windows Vista about 6 months to a year after it was released. I don’t remember it being exceptionally challenging as I was able to go to class and pass the test right away. I did leave the class early though. This may have been the best decision I have ever made in my entire life as I had some credit with a boot camp company that helped me to get my MCSA and if I had not gotten that, I honestly don’t know where I would be today. However, I can say I would be much more unhappy. Anyway, excited to learn this stuff and I’m pretty sure I can do it but I’ll take my time. You know, back to that MCSA on Server thing, I was shocked at how fucking hard it was. I mean, dang, I didn’t know any of this stuff and had no idea how anyone learned any of it. Please do support CED Solutions though. Obviously, I’m not in a position to go to boot camps for certs and my employment opportunities don’t usually entail jumping at the chance to make me more employable to a competitor.
Again, I don’t even know what the hell an HDLC header is so lets start there
Ok, good to know! But I’m not finding any info on whats normally in the header. And, the article mentions something about a protocol type.
This is different from the WIKI but who knows.
I’ve heard of MPLS but I’m not exactly sure what it is, so I’m going to have to check on that.
Multiprotocol Label Switching (MPLS) is a routing technique in telecommunications networks that directs data from one node to the next based on short path labels rather than long network addresses, thus avoiding complex lookups in a routing table and speeding traffic flows. The labels identify virtual links (paths) between distant nodes rather than endpoints. MPLS can encapsulate packets of various network protocols, hence the “multiprotocol” reference on its name. MPLS supports a range of access technologies, including T1/E1, ATM, Frame Relay, and DSL.
The second part of B is confusing because it seems like it should be a p2p local connection but this says WAN so who knows. Maybe I’m confused about the concept. D makes sense to me but I suppose I have to drop the assumption that R1 to R2 doesn’t include other hops.
This is like way outside of my comfort zone with understanding networking but I suppose its good to learn this stuff. So, the first step here is to see if I can find any YouTube videos about HDLC because I really don’t know anything about it. This is really painful to have to really study like this for some reason because I’m used to having a vague idea of a tech but it turns out there are lots of videos about this. Its just coming to that conclusion that I know “data goes, there’s like packets and capsules or something” and im certified on this! hahaha but as you can see below, this time last year i started working with a personal trainer and couldn’t do squats with any weight at all and was like holding on to these rope things and this weekend im expecting to set another personal record and do it 8 times after hitting a personal record I set 2 weeks ago 30 times. This is absolutely reasonable knowing my body and how I’ve geared up to press my legs, anyway. I’m sure ill post pics on twitter. Anyway, I listened to this and learned that the Cisco devices that use this add a type field and will not send using this protocol to non Cisco routers and its time to head home. Save a draft and keep going later tonight.
Well that wasnt really enough info
This gave me every thing i needed to know and honestly didn’t even finish it because i’m not sure how much of this ill need to know. I’ve done a few of this and know generally its best not to waste time on some of this stuff but you really have to get a feel for the learning curve. Anyway, ill probably end up coming back to it. I did this with Sec+, which is a real bugger, and it worked great. Also, i have no idea how that IP packets vary from HDLC packets and I should probably get into that at some point. Here is one more video that covers FCS but says nothing about the added Cisco Type field, which isnt surprising given this is just general networking knowledge.
ok, lets move on to question 4
My gut is C as when i look in routing tables I dont think ive ever seen a MAC listed and DNS does not normally use MAC addresses for anything.
I’m pretty sure this is C as well but its possible it’s A. in Azure its probably A lol
Turns out I was right!
I want to say C&D
Ok, that makes sense and D probably should be another protcol rather than “network discovery” not being included in this as A is a basic function. Its not really DNS though, right? I dont often look at whats in routers but im assuming its a routing table which does not provide name resolution, as I understand it? who am I asking this to lol
it says learn and PCs can keep local copies of DNS so im going with C as ARP tables are configured manually and ping isnt “learning” but I could be fucking this up lol
ok, i was right! I was thinking I would do two of these chapters per post but this is a really long post. I might get started on another tonight but after a 3 mile run, cleaning the house and generally acting like Thor which consists of dealing with problems that im good at dealing with that are extremely unique to my life situation, im kind of exhausted lol and my laundry is buzzing. that i have no intention of folding tonight. I hate doing laundry.