[Beginners assured course] Overcoming the weak vol.6! Essential points of the LAN

Show how to elementary assured course of many days, create a good many LAN theme.
LAN is short for Local Area Network, printer and sharing information such as documents and data, a specific range, such as homes and businesses within a sector, to connect to your computer. ( Wide Area Network WAN) means the wide area network as a keyword for this.

Various LAN and standards

There many types of LAN. Industry organization IEEE that standardizes and all standards are listed below. Suggestion to connect also do computer to computer without permission. Therefore, is because you to negotiated shape of cable and communications procedures. beforehand as a standard in the industry. The IEEE standard name or what it should remember one by one. Let us to understand the relation between type and transmission speed, access control method, and topology.

Well, here segment length (length cable to configure) and transmission speeds over Ethernet (one that contains the BASE table type) If is will have to memorize, know the standards perspective, is a resolution from 1. View of the Ethernet standard is below. Is 100 Base-TX FastEthernet, 1000Base-t is said also Gigabit Ethernet. Cable type is “T” all along 10bt and it will connect such hub concentrators in the star using wire (twisted pair cable).

Also, please note that wireless LAN. Early innovations, new standards are coming out one after another. The wireless LAN now has three effective speed not at the standards as none, at best what is about 50%. Then, aim at the effective speed of 100 Mbps is the IEEE802.11n standards may emerging recently inadvertently.

The following access control scheme and topology comes out it? > > page: h

Topology is LAN’s tie

Topology is LAN’s tie. There are three topologies.
Bus type
Is a way to connect multiple computers to one of the transmission lines. For middle of a transmission line linking each computer, connected part of one of the computer failure affected as a whole. However, it is to stroke the wiring, the change is not an easy.

Ring-type
The ring shape is a shape to connect the computers to the transmission channel. And connected part of one of the computer failure affects the whole. So, to keep dual ring of is a common configuration.

Star-
Concentrators (the hub), is a way to connect to multiple computers connected to the wiring. For separation of the wiring fault occurs connection where one of the computer’s whole is unaffected. However, the concentrators do damage will break the whole.

And access control method

Access control method, and is when the computer can interact with the data. LAN connected with great pains, even each computer began to communicate as it likes that causes the crash. Then, advance is mean decide how to control. There are three.

Spectrum
Most are now being used bus or star-mainstream scheme. And send the check or when computer start of communication, communications are not on the LAN. If luck started sending bad at the same time, the collision occurred, discarded both. And do the retransmission procedure decided. Increased retransmission increase the probability of collision also increase the computer connected to the LAN in this scheme,.

Token passing schemes
Is a method used in the ring. If you want to send to patrol the token on the transmission path called the token came when caught, pass the data. So good and aware of even a token, the collision does not occur.

CSMA
Are the methods used by the wireless LAN. Others verify whether being sent before sending the data to like CSMA/CD, CSMA/CA is. But it sends a signal which shows not the wireless LAN to detect the collision itself, receiving successful sender. Also waiting for a period of time this signal does not come sender resends recourse and failed.
CSMA/CD CD “Collision Detection”, while CSMA/CA CA “Collision Avoidance” is. That is, detects a collision and avoid collision, CD is because is CA.

Next is equipment between LAN and easily confused! > > Page: h

Connecting the LAN and LAN equipment

Router functions? including the exam well in examinations at. There is many Repeater, router and bridge are similar features also guides even by mistake carelessly, occasionally drop count. How it understood it?

Repeater
Electrical signals to ( weak ) attenuation in the LAN of bus types, such as 10BASE-5 and 10BASE-2, described in the Ethernet standard, limited cable length. Therefore, it over long want to amplify the electrical signal using this equipment ( strongly ) and to extend the distance of the LAN.
( the repeat repeat “iteration.” In other words, let repeated electrical signals received from the original LAN to LAN ahead of the extended the transmission range.

Bridge
To amplify the signals between the LAN and the simple were repeaters. Bridge does not relay communications which ends in the same LAN in addition to its function at the other LAN we have packet filtering features. ( Bridge ) is “bridge.” That is, is to determine whether the communication is the bridge between the LAN and the gatekeepers are there, look up the destination LAN.

Router
Router with the routing functionality to select the best relay route for transmission to the destination in addition to the features of the bridge. When you connect your LAN and LAN, and WAN connections use. Same protocol need to use network address to select the best route. ( router) router’s Guide on the “road”. In other words, to determine the way forward should be based on the address.

More like the image guide is in English, and was seeking to understand why.
LAN is better early innovations, computer magazines, such as strikes, reading I had read the latest technical information. Also, recommended links for beginners will be studied more in detail, in the “LAN” and encouraged.
Next beginner assured course Vol.7 is scheduled to release 10/10.

Qualification-related links ** IT-related
-Beginner assured course Vol.1 beginner assured wax
-Beginner assured course Vol.2 computer how rudimentary elementary
-Inside out elementary assured course Vol.3 CPU and memory!
Unit of elementary assured course Vol.4 hard disks and storage capacity
-Assured passing, beginner assured course Vol.5 tick to calculate!
-Powerful Vol.8 another occupational category PC qualification Guide! IT promotion reader IT qualifications
System / elementary administrator

AllAbout related links **
-LAN
-Mobile & wireless LAN