The issue of WiFi network in Bangladesh prospective.

If we want to make digital our country we need Wifi network.One day public WiFi is everywhere we go, such as at coffee shops, airport, rail station, park, libraries, print shops and even some fast food restaurants.We have already WiFi in some university like university of Dhaka. We can easily connect our laptop to it and we will be surfing the web in no time at all. Although it is convenient, it may not be safe. Hackers and scammers can tap into our unsecured connections and easily steal your personal information. We can protect your computer if you take a couple of precautions.

Help from:http://www.wisegeek.com/is-public-wifi-safe.htm

When we are using public WiFi, we have to sure to use a firewall. Firewalls give us extra protection, though not foolproof, from people trying to scam your information. Windows XP and Vista operating systems have built in firewalls.We can set up a firewall on computer by visiting some website as Microsoft website.

Public WiFi locations are not the place to conduct business that involves the use of private information. If a scammer hacks into a computer, all of us -- or our friend's -- personal information will be obtained. Even if we have a firewall, there is no guarantee that our information won't be stolen. Save business-related work, valuable data by using private network.

It may seem like a public WiFi location is the perfect place to do a little online shopping. It is, in fact, the worst place. While online shopping, we are likely to use our credit card to pay for our purchases. This places our credit card information out in cyberspace for dishonest people to use.

The suggestion is Feel free to browse your favorite online stores, but save the actual purchase until you have a secure connection.Never balance your checking account, or use any other online banking service, when accessing the Internet at a public WiFi location. Besides the stranger that may be looking over your shoulder, there are other people that may be tapping into your network connection. They can acquire your username and password as well as all your personal information.

We have to sure when using public WiFi that we disconnect any networked computers and file sharing. If a hacker does manage to access this computer, they will also be able to access any computers linked to that network. All the information stored on the computers will be accessible.

We should be aware of using digital network that doesn't mean I do not like WiFi network or I am opposing "Digital Bangladesh". I want to say our student should use it or the person have less valuable data to loss he should use it and important data must be used by taking above precaution.
source:http://www.wisegeek.com/

WiFi network may be best communication in a campus.

A Wi-Fi® or WiFi network is the most popular type of wireless network used to connect computers and share online access at home or at the office now-a-dys. It broadcasts network traffic over radio waves so does not require cable. It does this using a central device that is often three components in one: a network hub, router, and high-speed Internet modem. For simplicity we'll refer to this device as a router, though in some cases the router, which has a built-in hub, is purchased separately from the modem.

Each machine on a WiFi network must have an installed WiFi card or an external WiFi adapter. These devices incorporate a receiver and transmitter to send and receive data over the network to the router. Broadcast range varies up to 300 feet (~100m) or more, but is fairly centralized, creating what is termed a local area network (LAN). The WiFi router, cards and adapters use a common language or protocol to communicate that is compliant with a standard known as IEEE 802.11.

Within the 802.11 standard there are different generations of protocols, each designated by an additional letter. Generations to date include 802.11a, 802.11b, 802.11g and 802.11n. The first two flavors are now legacy, but as of spring 2009, 802.11g is still in widespread use with the newer and faster 802.11n on the road to replacing it.

All WiFi components in the network must support the same flavor or generation of 802.11 standards to communicate. If the router only supports 802.11g, the WiFi cards and adapters must also support 802.11g. If the router supports 802.11n, the cards and adapters must also support 802.11n.

Some routers, cards and adapters manufactured during transitional periods between changing standards will be designed to support both the current and the new protocol for maximum flexibility. These devices will be more expensive since the “g” and “n” networks utilize different frequency bands, requiring two radios instead of just one.

Components made for a WiFi network might be certified by the Wi-Fi Alliance. Certification ensures the product is fully compliant with the standard(s) it supports. Only a wireless network that has certified components is a true Wi-Fi network by technical standards, as Wi-Fi is a trademark of the Wi-Fi Alliance. However, “WiFi” or “wifi” has been generalized to mean any wireless network that complies with 802.11 whether components are officially certified or simply marketed as compatible.

When setting up a WiFi network it’s best to use the newest technology available in order to future-proof the investment. For home use, non-certified WiFi components might save a little money and will more than likely do the job just fine. If setting up a wireless network for a business, a true Wi-Fi network with certified components that have been fully tested and are known to be fully compliant might be a more prudent choice.

The 802.11 standards used in a WiFi network differentiate it from other types of wireless communications that use radio waves, such as Bluetooth® networks. Bluetooth uses a weaker, less robust radio band that travels a much shorter distance of up to about 30 feet (~10m). Bluetooth is primarily designed to connect battery-operated personal devices to one another for interoperability, creating a personal area network (PAN). Bluetooth might be used to pass files from a cell phone to a computer, to synchronize a personal digital assistant with a laptop, or to connect a wireless headset with a cell phone or MP3 player.

source: http://www.wisegeek.com/what-is-a-wifi-network.htm