Wireless – A forgotten topic on BCMSN.
I have a sneaking suspecion that I better pay alot of attention towards the wireless section of the BCMSN. It seems like its “out-of-scope” of the BCMSN, but Im quite confident that Cisco will really smack me on it for some reason.
Lack of the right equipment.
Lately I have been in the need of the right equipment for quite a few labs. What I really need is some equipment that is able to do both Dynamic Arp Inspection (DAI) and IP Source Guard (IPSG). The dynamic arp part is supported on 3550’s as far as I can see, but IPSG is not.
Been reading the study guide about L2 security. You can really mess up a whole network very simply, and you can basically take down the whole thing pretty easily if your switches are not configured correctly. There was also alot of things about IP spoofing and ARP spoofing.
The need for redundancy becomes clear…
Well, I broke the spanning-tree topology at work today. It was not one of my proudest moments 🙂 I was playing around with the very delicate portfast command, which states in all its glory: “%Warning: portfast should only be enabled on ports connected to a single
Gateway Redundancy.. Awesome
So im studying redundancy features, especially gateway redundancy features. I think this is some impressing technology. Basically there are three versions, HSRP (cisco proprietary), VRRP (IEEE Standard) and GLBP (cisco proprietary). HSRP was introduced in 1994, and VRRP in 1999, GLBP is alot newer, introduced in 2005.
CEF – A topic in disguise
Been reading about CEF yesterday. It doesnt take up much of the exam blueprint, nor CBT nuggets coverage of it. However, it seems that theres more to this than what meets the eye. I also need to figure out what CEF is doing in routers.
Inter-Vlan connectivity and enhancing switch features.
Today I have spent about 2,5 hours studying different features that enhances the switched network. This includes labbing up BPDU guard, Loop guard, UDLD Aggressive mode, BPDU filtering. Also I find the automatic error recovery feature very interesting. You can set certain causes to put an interface into the errdisabled state.
I have been working my a** off trying to understand STP just fairly well. Its a hard topic, especially with Rapid STP. I have struggled with the synchronisation/proposal/agreement thing. It has helped seeing it on the equipment though. An alternate port can be switched to immediately.
Server has been down, and BSCI is down.
Sorry about the lack of posting/progress reports. Also the server has been down for a while. In the meantime, I’ve passed the BSCI exam with an 833 score. Really got my ass kicked on some topics I didnt expect (IS-IS), and ofcourse multicasting which has turned out to be my arch-enemy.
IS-IS is very confusing..
Well, at least some of it. Adjacencies and how IS’s update other IS’s is the thing that nobody can give me an answer to. According to all the material IS’s maintain adjacencies to all others, but still elect a DIS.
(3) EIGRP – Labs
So yesterday, I started with all the lab exercises that has to do with EIGRP. I did the one in the self-study guide, and one (2.7.1) in the lab portfolio. I also started on 2.7.2. So far, the labs in the labportfolio are far better written than the ones in the self-study guide.
(3) EIGRP – Note taking
Alright, I am done with reading about EIGRP. I am now skimming through the chapter, and taking notes. I have an okay understanding of how EIGRP works, and I am looking forward to the labs to nail out unknowns. I am not 100% convinced about taking notes, or rather doing it in the order im doing (reading first, then skimming and taking notes, then going to the lab).
(3) EIGRP reading – continued
Today, I am continuing reading about EIGRP. My goal for today is to get at least 40 pages of EIGRP reading done. Lots of nitty gritty details such as unequal-load balancing and route authentication. To understand and process the material, 10 pages takes up 30 minutes of reading time.
(3) EIGRP Reading
Chapter 3, EIGRP. Started reading about the inner workings of EIGRP today. EIGRP is an improved distance vector protocol provided by Cisco themselves. It is an improved distance vector protocol, because it passes updates directly to its neighbours. It is more advanced than traditional distance vector protocols, because it supports VLSM and it does not use periodic updates.
(2) Routing principles – BSCI selfstudy
Okay. I will try and document some information regarding my study to attain the BSCI (Building Scalable Cisco Internetworks) exam. This is by many considered the hardest exam on the CCNP track (1 of 4 exams). I will tackle this one first, and then continue forward to the other exams knowing they will be easier.
Long time since last post
Okay, so its been a while since my last post. Been having some issues to deal with, which has taken quite alot of energy. I am going for the CCNP, starting with the BSCI exam. Ive got the books for it, and started studying.
CCNA completed :)
I am happy to report that I managed to pass the CCNA exam yesterday. What a relief.
Here it is:
Hopefully Maibrith passes her exam today as well!!
Update: She did pass it!
Bought a rack.
I just purchased a Rack from Dantrak UK. I need some sort of solution to mount the gear I have and will be getting. I cant have it all lay around the floor. They (Dantrak UK) is basically a reseller of Dantraknet.
rettighedsportalen.dk – a place for all things copyrighted
I was checking piratgruppen.org (A place in favor of sharing things online) the other day, and found that a new site, rettighedsportalen.dk had been started by a former spokesperson of piratgruppen.org. The site aims to shed some light on immaterial “rights”.
HP, stop making bad laptops!
Im writing this on my 3rd HP laptop in 2 years. This is a company owned laptop, because if not, I would never have purchased another laptop from Hewlett Packard. My first HP laptop was a so called NC8430, which is in their line of business laptops.
What I was thinking a while back..
This is cool, a p2p program based on real life trust. Alliance is a program that everyone has seen before, but with a twist. Instead of searching everybody and their uncle’s stash of bits, you only search a much smaller circle of people whom you already trust.
iPhone + dent
I watched an iPhone get a dent yesterday. Not a pretty sight. It was my girlfriends iPhone. She dropped it on the floor, and unfortunally it landed on the edge of a doorstep, causing it to get a dent. Nothing wrong with the glass surface or function of the phone at all.
12.000.000 is a very large number
But it is still the number of peers The Piratebay had sometime during the past week.A peer is defined in the bittorrent world as one who connects to download/upload some part of a file. The number 12.000.000 is also about twice the amount of people living in Denmark at the moment.
The proposed legislation for criminalizing internet users has been twarted — This time at least.
But it was a close one: “The vote was close, with 314 MEPs (Members of the European Parliament) voting in favor of an amendment to scrap what many consider draconian and disproportionate measures to protect copyright over the internet, and 297 voting against the amendment.
Filesharing: Filesharing as a technology.
Filesharing, as I define it, is a way for people to share files with one and another. Filesharing programs, are programs that enable people to do so. The programming instructions which perform the transfer of bits from one computer to another is a technology.
Creative's Crappy (C)oundcards and support
A fellow by the name of Daniel K has been supplying Windows Vista users with a usable Audio Driver on his own accord. He has been doing this work because Creative has been unable to support this platform which, apparently, quite alot of people are using.
I was right.
There was no Internet connection at my second hotel, that actually worked. I really do think its a necessity to have a good and reliable Internet connection for your visitors. Watching TV and reading books used to be what you could do in a hotel-room, now however, the Internet is the main source of information for many people, so why not give your hotel an edge and use it as a selling point?
Arthur C. Clarke has begun his journey toward the stars
Arthur C. Clarke passed away today at his retreat in Sri Lanka. Besides fighting the nazi’s by helping develop radar facilities, he is also behind many of the conceptual ideas behind space travel and sci-fi in general. He was always very philosophical about mans role in the universe, advocating space splunking whenever possible, and was of the belief that we would reach Mars by 2000.
Quote to ponder about!
“we think a life without internet may be worse than one without money.” — Gizmodo
What you dont want to see when you come to work as a sysadmin!
This really sums it up in my book
Macbook Air is really really thin.. And summary of my weekend.
Yesterday I went into a Humac apple store in Aalborg (Denmark… Its in Europe… Across the water.. anyways), to see the new Apple Macbook Air.Â Oh dear, thats a sweet little laptop. It really is as thin as you hoped it would be.