LAN Vs. WAN: Differences Between LAN and WAN You Didn't Know About

LAN vs. WAN - Difference Between LAN and WAN
The two most popular network types today are LAN (Local Area Network) and WAN (Wide Area Network). These two networks are generally classified on the basis of their coverage area. Given below are few points that differentiate these two networks.
Typically, a local area network exists in a house or a university campus, while a wide area network exists over many office buildings separated by a vast distance. The office buildings in a WAN may be in different countries or even continents. For example, the headquarters may be in USA, the regional office may be in the UK, and the branch office may be in India. The workers in these three buildings use a Wide Area Network to collaborate with each other. The Internet can also be considered as a WAN, with the Ethernet being a classic example of WAN. Let us have a look at the two structures and their differences.

The Differences

Speed1000 Mbps150 Mbps
Bandwidth for TransmissionHighLow
Data Transfer RateHighLow
Geographical CoverageSmallLarge
Connecting Hardware10Base-T CableLeased Line or Satellite
Technology UsedToken Ring & EthernetATM, Frame Relay, X.25
Transmission ErrorsFewMore
Setup CostLowHigh
Maintenance CostsLessMore
Network TopologyPeer to PeerClient Server Model
SecurityMore Secure than WANOpen to Threats
Signal DeteriorationNoYes
Equipment NeededHub, SwitchRouter, Modem
ExpansionUsing a NICUsing an Extra Router
Range1 kmUp to 10000 kms
Printer SharingYes, if in the same LANNo

The Structure

Local Area Network

Local Area Network

In a LAN setup, devices are connected to a switch or a hub. Shared devices are also connected to a switch that is centrally located. In case the devices need to be connected to the Internet, the switch is then connected to the ISP and thus, to the Internet. The data that is shared amongst these devices is stored in servers. If more devices need to be added, an extra hub or switch can be added.

Local Area Network (LAN) has higher bandwidth, thus is faster when compared to a WAN. The maximum speed of a LAN can be 1000 megabits per second. As LAN is faster, it is widely preferred for sharing computers in a network. The network is easy to set up, most computers and laptops manufactured today come with the RJ45 port built-in on the motherboard, which is used to connect to the network. In case of older machines that do not have this port, a separate NIC (Network Interface Card) will be required to be installed. This card fits in the PCI slot on desktops, and the PCMCIA slot on laptops.

The main advantage of using LAN is the ease of sharing. Computers, if connected to the same LAN, can even share a printer. The biggest hurdle that a firm faces while connecting computers in a LAN is the monitoring of traffic for the Internet. If there is too much load put on only one computer or on a shared device, the network speed may reduce. This can be circumvented by using a LAN traffic monitor, whose function is to keep a track of the bandwidth used. On the basis of setup and maintenance cost breakup, LAN is considered to be cheaper as compared to a WAN setup.

Wide Area Network

Wide Area Network

In a WAN setup, computers that are present at different locations are interconnected. The devices are connected to the router and the routers are interconnected via T1 standards. This makes it difficult to expand a WAN network.

Wide Area Network (WAN) has a lower bandwidth, thus slowing the network. The speed of a WAN can go up to 150 megabits per second. This means the speed of a WAN is one-tenth the speed of a LAN. Though WAN is slower, it is used widely to share data. The best example of WAN is the Internet. The data on the Internet is accessible across continents. However, a WAN cannot share computer peripherals, so a computer in one country cannot use a printer in another country. To set up a WAN, a modem and a router is needed. Thus, if an additional device needs to be added to the network, a router needs to be configured and connected to the others in the network. As the number of devices in a WAN are greater than those connected in a LAN, there is a greater need for a monitoring device. A special-purpose computer is used, whose only purpose is to send and receive data from the Internet. Leased lines or satellites are used to connect devices in a WAN.

While each of the two have their own advantages and disadvantages, there is also a distinct factor that helps one choose between a LAN and a WAN setup, and that is distance. If the locations to be connected are far apart, there is no point considering a LAN setup, as in spite of whatever advantages it may offer, it is not possible.