CompTIA Network+ Certification (2005 Objectives) Tutorials
Network Connectivity / Network Addressing
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Subtitles of the Movie (CompTIA Network+ Certification (2005 Objectives) / Network Connectivity / Network Addressing)
Network connectivity is an essential portion of our networks today. Network connectivity rely on many things to be operating just right and more effort to work properly. Some of the aspects of network connectivity that will be covering include network addressing and network addressing is very important because we have to know who to send data to and what network they are located on. Next we cover segments and subnets. This is a very commonly confused pair and is important to understand the differences between them. As data passes over the network it takes a very specific form called the frame or a packet. So we are going to take a look at this specific form and the different components and sizes that go on with it .There are many different types of connections. You can have a simple point to point connection or it can be as complicated as a multi point or multicast connection. As our data passes over a network we definitely want to make sure that data is the same when they comes on the recipients side as it was when it left . A good example of this is if you want to send a package to some one you definitely would want the content of that package to be the same when it was received on the other side. So let's take a look at network addressing. Some of the sections we will be covering here include NetBIOS names. These are very simple names that make our jobs as network administrator easy as long as our network stays at a relatively small size. Next we cover Media Access Control or MAC addresses. These are extremely important numbers that are actually hardwired into our network cards and other network devices. These are commonly referred to as a GUID or globally unique identifier. Finally we cover the network node id. When your networks become very large you must have several sub networks and you need to be able to uniquely identify those sub networks as well as the node or computers that are on them. NetBIOS names allow administrators to name our computers and use those names to communicate .Now NetBIOS stands for network Basic Input Output System. So you can get a pretty good idea that this is going to be a very primitive method of communication. So let us take a look at how these works. At the start of a data transmission computer one needs to find out where computer two is located and how they are going to communicate with computer two. So we will start out by sending a broadcast to our central connecting device .Now as we discussed earlier in those logical bus scenarios much like we have here that information is going to be heard by all computers in that area or attached to that central connecting device. So hopefully computer two would be somewhere around the central connecting device and if so computer two hear that and respond "hey, I'm computer two and here is how you can communicate with me" .Now one of the major problems with NetBIOS names and the way in which NetBIOS works is the broadcast that we mentioned at the very beginning of the data communication. Because it is a broadcast it generates a lot of traffic. Now to mention routers if used as the central connecting device don't tolerate broadcast at all. So as you networks become larger NetBIOS becomes more obsolete .When referring to media access control numbers or MAC addresses these are twelve digit the hexadecimal numbers that are actually burned into network cards and network devices .You should also know that the first six digits of a media access control number or the manufacture id. The last six digits is a unique identifier used by that manufacturer so they can track all the network cards that they sell and you can look up your media access control number by using a simple command. We are going to open up our command prompt and with in that command prompt we will run the command IP config\all .You will notice in your output here 0003ff is our manufacture id which happens to be an Intel card. A unique identifier for Intel is the 369c45.So all traffic coming from this media access control number is linked back to me. So let's take a look at how network and nod id's function on larger networks. In this example we have two networks, we got the one hundred network and we got the two hundred network. Now one of the requirements of data transmission is that all computers that will communicate must have the same network id. So in this example only computer 7 of network 100 and computer 8 of network 100 would be able to communicate and of course all the computers with the 200 network address will communicate as well. So the basic rules consists of this, you have to have a unique identifier or node id and you have to have a common network number with all the computers considered to be on your network . So this should give you a pretty good idea of how our networks feel when combined with network addressing. Next we will talk about subnets and segments and how they are different from each other.
Tutorial Information
| Course: | CompTIA Network+ Certification (2005 Objectives) |
| Author: | Brad Causey |
| SKU: | 33608 |
| ISBN: | 1-932808-53-1 |
| Release Date: | 2005-03-22 |
| Duration: | 7 hrs / 97 lessons |
| Captions: | No |
| Compatibility: |
Vista/XP/2000, OS X, Linux QuickTime 7, Flash 8 |
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