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CompTIA Network+ (2009 Objectives) Tutorials
Ethernet Basics / What is Ethernet?
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Subtitles of the Movie (CompTIA Network+ (2009 Objectives) / Ethernet Basics / What is Ethernet?)
In this video let's tackle the question: just what exactly is Ethernet? You're going to hear a lot about Ethernet in any kind of networking conversation, any kind of technology read about networks. Our networks that we use predominantly from our Local Area Networks and the Internet and so forth is using Ethernet. Now what's interesting is the Ether portion of Ethernet came from that scientific understanding of the ether, the cloud, if you will. That space that's out there in outer space, and they were kind of pulling in from that. So they've been doing the Star Trek stuff longer than we have. But anyway, the bottom line, the simple fewest word definition of what is Ethernet is it is a family of frame-based networking technologies and we'll do a separate video on the frame so look for that one a little bit later on. But the bottom line on this is, is it simply defines the wiring standards, how things connect, and then more importantly or just as important, I guess, is the signaling standards - how do we pass the electronic pulses across the wire? Instead of zeros and ones we really are talking about electric pulses, electronic pulses on the wire and so we determine standards on how to read these pulses on the wire. Now, most of the Ethernet standards that were created by the IEEE correspond, or take place if you will, in those first two levels of the OSI model - the Physical layer and the Data Link layer. Now the standards for Ethernet as set by the IEEE are out there in the Project 802.3 and I would strongly advise you, if you're brand new to this or if you've never read this, to just go out there and kind of read about Ethernet, the whole frame-based technology idea. It will actually help you in troubleshooting at some point down the road. Now you can easily get to this and see it out on the Web and I hope by the time you get this video that this link is still good, but this has the different sections of the 802 standard, 802.3 standard, that you can read, and you can read the actual documents that they use to set the standards and so forth. It can be kind of interesting and again, it can help you get to sleep on those nights when you just can't drop off. But there are some Ethernet project standards that you need to be aware of and you need to know these for the exam, so just memorize these. First of all, 802.3 is the project standard as set forth by the IEEE for Ethernet functionality. And when I'm talking about Ethernet functionality here I'm talking about CSMA slash CD, and we will talk about that in a separate video as well. Don't worry about it right now. 802.3u, you can see what these nerds do, they set a standard 802.3 and when they want to add anything to it, enhance it, change it, they just simply start tacking letters on the end. So 802.3u has to do with fast Ethernet which is 100 megabits per second. It started out at 10. 802.3z has to do with gigabit Ethernet, and this is gigabits, which is 1,000 megabits per second. But 802.3z specifically pertains to non Unshielded Twisted Pair cable mediums that gigabit Ethernet is being passed over. 802.3ab has to do with Unshielded Twisted Pair utilization of gigabit Ethernet. And then the last one, 802.3ac, has to do with 10 gigabit Ethernet. And as you can see, the stages keep going, but to keep milking more and more data efficiency and speed out of our networks the IEEE continues to tweak the standard and talk about how we do it in new and improved ways. So the Ethernet is really just a collection of standards laid out by the IEEE. Everybody agrees with them, everybody sticks to them. Manufacturers build their devices based on this and everybody's cool and Ethernet functions and it's a really cool thing to see.
Tutorial Information
| Course: | CompTIA Network+ (2009 Objectives) |
| Author: | Mark Long |
| SKU: | 34216 |
| ISBN: | 1-936334-90-9 |
| Release Date: | 2011-04-29 |
| Duration: | 6 hrs / 91 lessons |
| Work Files: |
Yes |
| Captions: | No |
| Compatibility: |
Vista/XP/2000, OS X, Linux QuickTime 7, Flash 8 |
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