How does a LAN work?

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A LAN network is local area network . LAN is used at a smaller level . LAN is used in small organizations.
LANs
  • A Local Area Network is a small network which is usually contained within one building or campus. It is usually a private network, unlike the public internet. An Administrator in charge controlls file sharing, access and many other factors. LANs can be connected to public networks like the Internet, with some precautions (against hackers, viruses etc). Usually a firewall/proxy server/router acts as the gateway between the LAN and the Public Network. A popular wired LAN technology is the Ethernet (Sometimes called IEEE 802.3). These days Wireless LANs are becoming popular. They are collectively known as IEEE 802.11 LANs.
  • I could spend hours going into detail about this question, but I won't. Basically the proxy server will go to internet to pull a webpage for the client requesting it. It also will store a copy of this page (cache) for future requests. Another function of the proxy is that is hides the clients IP address from the "outside world", and uses its own. Therefore, the webmaster of the webpage cant see the IP of the client requesting the page because in actuallity the proxy is requesting the page.



LAN
lan stands for the local area network .ie if you are connecting you comouter or devices (printer ) in a specific limited area ie locally .
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A LAN allows certain computers on the network to offer their resources (hard disks, floppy disks, CD-ROMs, Printers, Modems, etc.) for use by other computers on the network as if they were their own. Computers that offer resources are called Servers.

Computers called Workstations can attach the resources (typically hard disks and printers) offered by servers as if they were their own. For instance, at AA Company, computer #1 has a C: hard disk and a D: CD-ROM. Computer #2 has a C: hard disk and a D: CD-ROM, but computer #2 also attaches computer #1's C: drive as it's own F: drive. To the user of computer #2 it looks as if drive F: is in his own computer. He can use files and programs from the F: drive just as he can from his own C: drive. The network software module that performs this slight of hand is called the redirector.

A computer can be both a Server and Workstations at the same time, in which case it is called a Peer. Networks without dedicated servers are called peer-to-peer networks. Networks with one or more dedicated servers are called server based networks even though they may also have peers on them.

Back to our example. The network computers #1 and #2 are on has a server, computer #3. Computers #1 and #2 each have a copy of an accounting program on them, but both read and write accounting data to their G: drive, which is actually C: on computer #3. The tape backup unit is on computer #3 and backs up all the accounting data for all the computers every night by backing up its own C: drive.

When computers #1 and #2 are using the accounting software that software is running in their own memories. The server is not involved at all except to offer its hard disk for data storage. This server is called a file server.

Since this is a Windows accounting package it is big and slow and swaps to disk a lot, so each computer has it installed on its own hard disk to get decent performance. In the days of small fast DOS programs, workstations would also load the program from the server, so it only had to be installed once in one place.

When computers #1 and #2 do sorted reports, every record has to be read from the server and sorted in the memory of the workstation and written back to temporary files on the server. This causes a lot of network traffic on a larger network.

Lets say AA Company grows a lot and now still has computers #1, #2 and server #3 but has added additional workstations #4 through #29 - and lots of users of the accounting software. all that network traffic causes the network to get really bogged down and users start to complain.

What AA Company does now is ditch that Windows accounting package and install a new multiprocesor Compaq server running Windows NT. The new accounting package uses the Oracle database program to store its data at the server. This new package actually runs on the server (which is now called an application server because it has applications programs running on it). The workstations just have a client program that asks for records and has input and viewing screens. If a client asks for a sorted report all the work is done at the server, cutting network traffic way down. This is called a Client Server network.

Meanwhile, across town, BX Company started with its accounting on a Xenix host computer with some "green screen" terminals wired to it (instead of PCs like AA Company used). There was no network at all, just a lot of serial cables connecting dumb terminals and printers to the host computer.

As it grew, BX upgraded to a Unix host computer and added some PCs that were also wired back to the host and ran terminal emulation software so they could act as terminals to use the accounting. Some of the PCs also got their own printers, which also act as slave printers to the Unix box. Still no network.

Finally, BX Company needed to exchange marketing and project files among the PCs, so they installed a peer-to-peer network connecting all the PCs, and included their big honk'n Sun Enterprise Unix box in the network too. The PCs dumped the terminal emulation package and use telnet which allows them to act as terminals over the network - no more serial cables. Later they add a Linux box to the network to act as a file server, as an Intranet Web server and as a firewall for their DSL connection to the Internet.


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ANSWER


LAN is a Huge topic and to know how it works you need to understand what it features are and in what ways a LAN can work like it can work in a Ring Network,Bus Network...It can be used With WAN from a larger to cover a small area,The transmission can be provided by the Token Passing Technique or the Carrier Sense Multiple Access/Collision Detection Technique...The OSI Layers...The hardwire and the software Required...and so On.
I think you can start from the basics to have a better understanding and don't miss out anything.Search in Google or better buy a Book on Networking.
269 people found this useful

Why would unplugging and then reconnecting a LAN to a DSL modem make an Internet connection work again?

Answer . It's not that it makes the Internet respond, it makes your DSL modem respond. Occasionally DSL and Cable modems will become unresponsive for whatever reason. Disconnecting and reconnting the Internet connection cable is one way to "wake up" the modem. Often that doesn't work and you ha (MORE)

What is a LAN card?

A LAN (Local Area Network) card is an electronic card that isplaced in an expansion slot on the motherboard. This will allow youto connect your computer to a cable or DSL modem. Nowadays, theseLAN ports are built right into the motherboard themselves. It wasthe older models that required the LAN car (MORE)

How does LAN work?

A LAN is a Local Area Network...First you have a computer which links to a network which links to an Internet Service Provider(ISP) like DSL or Cable or something Answer A LAN doesn't have to be connected to the Internet. Any group of computers in the same location that are networked together is (MORE)

How does wireless LAN work?

Answer . Wireless equipment transmits the data using radio waves. The frequencies vary depending on the specific equipment being used. Most modern wireless routers and cards are capable of 10mb+ speeds.

What is a LAN?

LAN is a Local Area Network A LAN is the short abbreviation forLocal Area Network. In a LAN you usually have many computersconnected together using ehternet, Wifi, etc. The computers in Lanhave the ability to share resources such as printers, scanners,hard drive space, and an internet connection. Th (MORE)

What does a LAN do?

it allows for many local computers say in an office to share information on 1 server, 1 internet connection, 1 printer/fax/copier etc.... instead of supling all data to all pc's and a printer for each machine.... hope this helps a little

Advantages of LAN?

LAN Advantages: -Workstations can share peripheral devices like printers. This is cheaper than buying a printer for every workstations. - Workstations do not necessarily need their own hard disk or CD-ROM drives, which makes them cheaper to buy than stand-alone PCs. - User can save their work cent (MORE)

How does a LAN switch work?

http://www.cisco.com/warp/public/473/lan-switch-transparent.swf. http://www.cisco.com/en/US/tech/tk389/tk689/technologies_tech_note09186a00800a7af3.shtml. Go through this link to understand them better.. This will answer all your questions and let me know if you have any other question

How lan works?

Also know about LAN Surveyor... IT automatically discovers your network and produces comprehensive, easy-to-view network maps that that integrate OSI Layer 2 and Layer 3 topology data.

How does wirless lan work?

A wireless LAN or WLAN is a wireless local area network, which is the linking of two or more computers without using wires. WLAN utilizes spread-spectrum or OFDM modulation technology based on radio waves to enable communication between devices in a limited area, also known as the basic service set. (MORE)

Use of lan?

LAN refers to a Local Area Network. The LAN is used to networkcomputers within a limited area like school, building or computerlaboratory by using the network media.

How do you troubleshoot LAN?

You have to be more specific than that. There are hundreds off different things that can go wrong with a lan. You can have problems because of faulty hardware, you can have problems because of lack of privileges, you can have problems because of badly configured firewalls, you can have problems with (MORE)

Why Wireless Internet is not working when Ethernet LAN enable?

If your Wireless Internet is not working on your computer and your router (HUB) is connected to the internet, there are two possible causes for this dilemma. Either you cannot connect to your wireless network, or you are connected to your router(network) and your computers network settings are causi (MORE)

What are LANs?

LAN stands for Local Area Network. A computing term for a method of connecting computers, generally using wires, and generally in the one building.

How do you creat a LAN?

If you dont know anything about LAN's I would suggest you get this book. Computer Networks by Andrew S. Tanenbaum Its a bit pricey but this book is the ultimate when it comes to networks. Even check the reviews on amazon. You wont beat this book.

How to build a LAN?

That's not a question that anybody can really answer without some additional info. Whats the budget? Whats the purpose of this LAN? How many computers are going to be on this LAN? Does it require internet access? Is it to be a wireless lan, or is it to be wired? How big of a priority is security? Do (MORE)

What does a lan does?

A "LAN" stands for Local Area Network. It's just what it sounds like. A group of private computers that are connected by a common private network. If you have 2 computers in your home, and they are both connected to each other, either by cable or Wi-Fi, it is considered a LAN. The World Wide Web is (MORE)

What is LAN tester?

A LAN tester is a circuit used to check the LAN cables. They runfor approximately $41.00 in most electronic stores.

What is a lan fax?

This is different from traditional faxing. LAN faxing is routed through the Internet instead of analog phone lines. Using your Internet connected PC, you can sens and receive faxes directly to your inbox. This is commonly known as Internet fax, online fax, fax by mail or email faxing.

What is v lan?

It's an ID tag that's applied to a switch port (or other network equipment) that allows devices to be segrigated to v (virtual) LANs. It can be setup so that devices think they're on a completely indendant network, even though they're part of the same infrastructure.

How do you hide lan ip address from monitoring at office work while downloading?

1. Open Internet Explorer and click the "Tools" option at the top of the page. . 2. Select "Internet Options," then select "Connections." Finally, click "LAN Settings." . 3. Check both boxes under the "Proxy Server" section. . 4. Type "relay.testproxy.org" in the Address box, then type "8231" (MORE)

What is hyper lan?

( HI gh PER formance R adio LAN ) A wireless LAN protocol developed by the European Telecommunications Standards Institute (ETSI) that is similar in function to Wi-Fi in the U.S. HIPERLAN/1 and HIPERLAN/2 offer 20 and 54 Mbps data rates respectively in the 5 GHz band. Unlike 802.11a, HIPERLAN pro (MORE)

Why wont your 802.11g LAN work with a secured wireless network?

What do you mean working with each other? 802.11g is the wireless protocol, which you can secure with WAP or WEP encryption and it would be called a secured wireless network. Also, it would be called a WLAN for wireless local area network. They're the same thing.

What can LANs do?

LAN means Local Area Network. It can connect computers within buildings and a limited area and can also share resources like printers.

What are the porposes of lan?

To enable aquatic mammals to communicate with each other? Sorry. I couldn't resist playing on the typo, 'porposes'. A local area network (lan) is used to connect two or more computers in close proximity to each other -- usually in the same building or campus -- so that they can share files, applic (MORE)

What is the range of LAN?

It depends on which type of cable you are using. For UTP and STP it's 100m, for fiber optics it can be as far as 40 km (single mode), for coax is 175 m for thinnet and so on.

How do you transfer files from lan to lan?

To transfer files from two disconnected local area networks, you would need to use an external connection. You could use manual transfer through media such as disc, cd, dvd, flash drive, or other ways such as through the internet.

What is the uses of LAN?

Local area networks allow computers to be connected together to share services, peripherals and to allow control of groups of machines.

What are the LAN peripherals?

The LAN peripherals are any additional devices added to the computer to give extra functionality e.g. Printers, Scanners. Barry =)

Is wireless lan built in laptop capable to connect and work in a car?

Not yet. Most wireless devices like the iPod, and other MP3 players use Bluetooth wireless to connect to some of the newest car radio's. The wireless Network card in the computer is a different form of wireless. If the laptop had Bluetooth built in I don't think it could then either? Not set up th (MORE)

How make lan?

It depends under which context you intend to create a Lan connection. If you want to have a "Lan party" where you and a bunch of friend all play the same game, then there is no definite answer. You will have to Google "Lan connection ". If you are talking about Lan in just a general, networking, lik (MORE)

What airline is lan?

LAN, formerly known as Lan Chile is the national airline of Chile. It is part of the OneWorld Alliance and has a large number of dedicated passengers. It's base is in Santiago.

How do LAN switches work exactly?

LAN stands for Local Area Network. LAN switches work when switches are configured to limit broadcast levels. LAN switches are produced by the company Cisco.

How is a LAN used?

A LAN, as in Local Area Networks , is used to connect a group of computers together to share resources and exchange information.

How do i get minecraft lan to work in 1.10?

If you are trying to play with friends over the internet, LAN isnot an option. Look for server hosting websites such as server.proor aternos.me. LAN is for playing with others connected to the samerouter. In game, simply pause the game and press 'open to LAN' andthe rest will be sorted.