To protect your network is possible, for this there are means of protection of Wi-Fi, it is based on encryption of traffic between the access point and the device that is connected to it.
What is Wi-Fi?
Wifi stands for Wi- Fi . WiFiIt is based on the IEEE 802.11 family of standards and is primarily a local area network (LAN) technology designed to provide in-building coverage.
Today's WiFi systems support a peak physical data rate of 54 Mbps and typically provide indoor coverage up to 100 feet away.
WiFi has become the standard de facto for broadband connectivity at the last mile in homes, offices and public hotspots. Systems can typically provide coverage of only about 1,000 feet from an access point.
Wi-Fi offers significantly higher peak data rates than 3G systems, primarily because it operates in a bandwidth of more than 20 MHz, but Wi-Fi systems are not designed to support high-speed mobility.
One significant advantage of WiFi over WiMAX and 3G is the wide availability of terminal devices. The vast majority of laptops shipping today have a built-in WiFi interface. WiFi interfaces are now also built into a variety of devices, including personal information devices (PDAs), cordless phones, cell phones, cameras, and media players.
Channel bandwidth
WiFi standards define a fixed channel bandwidth of 25 MHz for 802.11b and 20 MHz for 802.11a or g networks.
Radio signals are the keys that make a WiFi network possible. These radio signals, transmitted from WiFi antennas, are picked up by WiFi receivers, such as computers and cell phones, which are equipped with WiFi cards. Whenever the computer receives any of the signals within the range of the WiFi network, which is usually 300 to 500 feet for antennas, the WiFi card reads the signals and thus creates an Internet connection between the user and the network without using a cord.
Access points, consisting of antennas and routers, are the primary source of radio wave transmission and reception. Antennas are stronger and have a longer radio range of 300-500 feet, which are used in public places, while a weaker but more efficient router is more suitable for homes with a radio range of 100-150 feet.
History of the origin of Wi-Fi
You can hardly meet a person who doesn't know what Wi-Fi is, but not everyone knows when the name and the technology itself appeared.
Originally it was thought that wi-fi appeared in the early 90's. But this is far from it, it begins its history in 1985 in America, when a federal agency allowed the use of a certain radio frequency without a license, soon a large number of companies decided to start developing devices for wireless networks.
The Wi-Fi as we know it today comes of course later, in 1997 they released the 802.11 standard which was the starting point for our future.
A little later in 1999, the Wi-Fi Alliance launched the first routers on the market, the data rates were of course very low compared to the modern routers but it was a breakthrough at the time. After all, the transmission speed was up to 11 Mbit / s, with a range of 2.4 GHz.
The originator of the Wi-Fi protocol was engineer John O'Sullivan.and he created something that almost every other person on earth uses.
What are the Wi-Fi standards
During the existence of wireless data transfer, there have been many standards that are used in digital electronics, tablets, smartphones, laptops.
We will give only the basic standards of wi-fi, and consider how they differ from each other.
Wi-Fi
The very first wi-fi standard did not have a high speed, the data transfer was only 1 Mbit/sec which is very low to today's standards.
Wi-Fi 802.11a
The first protocol from the Wi-Fi Alliance was 802.11a, a breakthrough in the world of wireless Internet. This brought the data rate up to 54Mbps and allowed for a 5GHz band.
Wi-Fi 802.11B.
With this protocol engineers managed to make cell phones transmit data up to 11 Mbps, also the right decision was to revert to the previous 2.4 GHz frequency as it has a wide coverage area.
Wi-Fi 802.11G
The release of this standard was in 2003. The speed of the protocol was up to 54 Mbit / s for receiving and transmitting data, it was mainly used for laptops. Cell phones and smartphones did not need such high speeds.
802.11N Wi-Fi
In 2009, 802.11n was released, digital technology had made a leap forward and everyone was excited about the high speed standard.
It created MIMO technology, thanks to which it was possible to transmit data in two channels and the speed was 600 Mbps, while the average speed was considered to be 150 Mbps.
This standard is considered to be popular nowadays.
Wi-Fi 802.11AC
The newest 802.11AC protocol standard differs from the previous one in that it is available only at 5GHz. It has less coverage than 2.4GHz, but thanks to enhanced MIMO technology and directional antennas the data transfer rate is up to 6.93Gbps which is a record high today.
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