A look at local area network lan and how it works

LANs can maintain connections with other LANs via leased lines, leased services, or across the Internet using virtual private network technologies. You've probably heard of hacking, which, in one sense of the word, means gaining unauthorized access to a computer network by cracking passwords or defeating other security checks.

local area network pdf

All you need is an Android phone. Not so long ago, computers were all made by different companies, worked in different ways, and couldn't communicate with one another.

Metropolitan area network

Popular topologies include:. Permissions and security Just because a machine is on a network, it doesn't automatically follow that every other machine and device has access to it or can be accessed by it. A LAN network administrator's job responsibilities include: installing LAN network components, tracking and renewing licenses for software and equipment, monitoring LAN performance, upgrading LAN network software and hardware, creating network redundancy and backups to ensure continuity in the event of network failure, and installing software and hardware to ensure local area network security. In this article, we break it down for you. Or what if a bank is sending an electronic payment to someone and the data it transmits across its network is corrupted so the account number or the amount to be paid gets scrambled? Can you make your Windows computer run like a WiFi router? Fortunately, since a book is analog information, a bit of damage to the cover doesn't stop you appreciating the story the book tells or the information it contains. Typically, each vendor would have its own type of network card, cabling, protocol, and network operating system. At the top, in the Application layer, you sit at your computer using an email program an application that uses all the layers below. However it is also used for developing internet connections and for distributing cable channels. Application: The top level of the model and the one closest to the user.

Artwork: The basic concept of a computer network: a collection of computers and related equipment hooked up with wired or wireless links so any machine can exchange information with any other.

The Internet is an obvious example. The physical layer isn't concerned in any way with the data the network carries and, as far as most human users of a network are concerned, is uninteresting and irrelevant.

First, computers would connect through the "ether" a semi-serious, semi-scientific name for the void of emptiness that separates them using standard coaxial cable wires like the ones used in a television antenna connection, made up of concentric metal layers.

In the last decade or so, wireless connections have become one of the most popular ways of doing this, especially in homes.

Lan network range

Every time you send seven bits, you add up the number of ones you've sent. Does that mean it's all over for Ethernet? Increasingly, though, we're shifting to mobile devices that need to improvise networks as they move around the world. Modern LAN-connected machines can talk to each other as well as external computers such as the web servers housing awesome sites like MakeUseOf. Application: The top level of the model and the one closest to the user. The point is a simple one: when we send data over computer networks, we need to be absolutely certain that the information received is identical to the information transmitted. During the s and s, everything became much more standardized and it's now possible to connect virtually any machine to any other and get them exchanging data without too much effort. You can connect them in a star shape with the various machines radiating out from a central controller known as the network server. The network I'm using to link this laptop to my wireless router, printer, and other equipment is the smallest imaginable. A popular and technology phrase is the LAN adapter. Deploying a Wireless LAN Wireless networks are relatively easy to implement these days, especially when compared to the prospect of having to route wires when deploying a new wired network or overhauling an existing one. What if all the network devices are using slightly different versions of Wi-Fi or Bluetooth; will they still be able to connect? To make a network, you need nodes and connections sometimes called links between them. Apart from computers, peripherals, and the connections between them, what else do you need? Keep in mind that the standard you need to accommodate your network access points and routers as well as the entire collection of wireless network interface cards NICs for your computers and other network resources.

Deploying a Wireless LAN Wireless networks are relatively easy to implement these days, especially when compared to the prospect of having to route wires when deploying a new wired network or overhauling an existing one.

The IPv4 standard dictates that members of private local networks use a particular range of addresses, as follows: And while Ethernet is still a key element in most LANs both at home and at the office, they are not one and the same.

Presentation: This effectively translates data produced by user-friendly applications into computer-friendly formats that are sent over the network. If communication is entirely wireless, how can it be properly secured?

Wide area network

If they'd never been invented, you wouldn't be reading this now using the Internet and I wouldn't be writing it either using a wireless home network to link up my computer equipment. Wi-Fi wireless Ethernet is one example of how smartphones, tablets, and other mobile computers can join and leave fixed networks based around "hotspots," or access points in a very ad-hoc way. Networks on the fly Like highways or railroad lines that connect towns and cities, computer networks are often very elaborate, well-planned things. Otherwise, your computer will need to venture into the internet to contact it. If you set them up with addresses from different ranges e. Backbone - The backbone is the main cabling of a network that all of the segments connect to. Keep in mind that the standard you need to accommodate your network access points and routers as well as the entire collection of wireless network interface cards NICs for your computers and other network resources. LAN Local Area Network was developed with a view to establish better interconnections within the individual computer units. Things that happen at the higher levels could be carried out in many different ways at the lower levels; for example, you can use a web browser like Firefox an application on many different operating systems, and you can run various operating systems on a particular laptop, even though the hardware doesn't change at all. The risk of data loss is reduced due to the effective physical backup system.

In this article, we break it down for you.

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Local area network