CompTIA Network+ Certification (2005 Objectives) Tutorials
Network Connectivity / Types of Connections
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Subtitles of the Movie (CompTIA Network+ Certification (2005 Objectives) / Network Connectivity / Types of Connections)
As data moves across the network it takes the form of several different transmission methods .So we take a look at these three methods which once would provide benefits for us in a network environment .Next we cover connection types .You can make a simple point to point connection or a complex multipoint or broadcast connection. So we cover these different connection types and finally in this section we talk about connection hand shakes .In order to have a true connection there is process that you have to follow before you are considered connected .There are three different forms of transmission on a data network. First we talk about a simplex mode. Simplex is very much like the radio you listen to in your car .You have a broadcast center and all the data transmits only in one direction. We don't actually use this type of transmission method in networking. However, the most common mode of data transmission is called half duplex. With half duplex our data lines carry data in both directions. The only restriction is that they can only go one direction at a time. So if computer one wants to communicate with computer two they would send its information and as soon as it was finished computer two would then send its information back to computer one. Now if it is available to us the full duplex mode of communication is buy for the best and this allows us to send information in both directions at the same time. Now often times in order to get full duplex to work on your network we have to spend quite a bit of money. Your network cards and all your network devices have to support the full duplex data transmission modes. When establishing connections across the networks they can take on several forms. The first and most common type is our point to point connection .So let's take a look at what will happen here. Let's say that this computer wanted to communicate with this computer .In this example this computer would send what is called the unicast and a unicast can be renewed easily by unicycle .There is only one wheel on a unicycle and there is only one point of connection after the recipient in a point to point connection .So we would send our information back and forth between this point to point connection. So we will all be communicating with each other .In our next type of connection we have multipoint. This is also called a multicast. So in this example one computer might send the data signal to several computers .Now couple of things to be aware of about multipoint connections is multipoint connections requires special software such as imaging software that is the most common example that you see at this in a network. Also if you have routers those routers must support multipoint connections. They actually have to have the ability to read a data packet that is going to several recipients. Another common form of data transmission is the broad cast and actually in a broad cast depending on our central connecting device this computer when sending one out all the computers that were connected to the same central connecting device or the same broadcast domain would hear its data signal. Now hubs and switches don't mind affording broadcast out of ports. But if you are using a router it will stop your broadcast. The process of establishing a connection is a three step very simple process. So in this example computer one is going to send its information to computer two. So we send a synchronized packet. Assuming that the recipient computer agrees with the communication should take place it will return with both an acknowledgement and another synchronized packet so synchronizing in both directions. Now once the initiating computer receives the act and the sign they will return an acknowledgement finalizing the hand shake process .So let us actually look at this in action. We will open up our network analyzer go and get our setting ready to go. Now we go ahead and initiate a point to point connection using remote desktop .So let's see if we can find the sign act process and here it is. You can see we will start out and in this example scroll down just a little bit and take a look and the send packet is turned on over the sin bit .And you have noticed on here all the flags it could be turned on the sin is set to one which means it is on. In our next one we can see both the acknowledgement and synchronize bits are set on. So this is our return back from the recipient stating that we have received your request and we are acknowledging it. And finally the last acknowledgments from the originating computer saying, "hey, let's go ahead and finish up this hand shake so we can communicate". In our next section we talk about reliable delivery.
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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