Next talk about wireless basics-Wi-Fi wireless technology

Can we differentiate many wireless technologies? Wi-Fi wireless technology is widely used. As one of short-distance wireless transmission technologies, it has many advantages such as low cost and low power consumption. The following is a brief introduction.

Wireless Network basics: Wi-Fi wireless technology

The concept of wireless includes many aspects, such as mobile phones, cordless phones, Global Positioning System GPS), AM/FM radio, LAN wireless systems, and WAN wireless systems. This article will discuss the IEEE 802.11 LAN Wireless System and Wi-Fi. Wireless Fidelity is a user-friendly name for the Wireless Fidelity, Wi-Fi) Wireless network protocol 802.11 family, the purpose is to give users a name closer to market requirements, without pure technology name 802.11. These protocols are developed by IEEE.

IEEE is also responsible for maintaining the wired Ethernet version, such as 802.3. On the terminal device, the wireless consumption is similar to the wired device. The biggest difference between them is that wireless networks do not require physical wiring. Physical wiring is the basic structure of a wired network. Therefore, wireless network applications can be performed on a new or existing wiring interface, without the overhead that is commonly required for LAN scaling users. Although wireless has such advantages, you still need to consider some issues before deciding whether the wireless network can be used as the best connection solution. These problems include:

◆ Wired Ethernet is usually faster than most Wireless Networks

◆ The blocking and interference modes of wired and wireless networks are different.

◆ As long as the maximum cabling length is not exceeded, the performance of wired Ethernet will not decrease as distance increases

◆ Wired Ethernet is safer than wireless networks, because the attacker of wired Ethernet must obtain the connection of physical lines before launching attacks. Denial-of-service attacks on wired network systems are also more difficult.

Because wireless networks transmit data through public radio waves, rather than network cables. If you want to intercept wired LAN data, the intruder must first establish a physical connection to the network, either through a local Ethernet physical connection or through a logical connection to the Internet. For wireless systems, attackers may only need to receive signals in the parking lot on the street. Even if you encrypt your wireless network data, attackers can still sniff it. Before we discuss in depth how wireless networks are attacked, we should first discuss some basic wireless concepts, and then continue wireless attacks, hacking tools, and some methods to protect the security of wireless networks.

Wi-Fi wireless technology, like bluetooth technology, is short-distance wireless technology used in offices and homes. This technology uses a 2-4 GHz band, which is currently not licensed as a wireless band. Currently, two standards are available: IEEE802.11a and IEEE802.11b. This technology has its own advantages, so it is favored by manufacturers.

Wi-Fi wireless technology highlights the following advantages:

First, radio waves cover a wide range. Bluetooth-based radio waves cover a very small area with a radius of about 50 feet or about 15 meters, the Wi-Fi radius can reach about 300 feet or about 100 meters. Needless to say, the Office can also be used in the whole building. A new vswitch launched by Vivato recently. It is reported that this product can extend the current Wi-Fi wireless network distance of 300 feet close to 100 meters to 4 English Rio 6.5 kilometers.

Second, although the wireless communication quality transmitted by Wi-Fi wireless technology is not very good, the data security performance is worse than Bluetooth, and the transmission quality needs to be improved, but the transmission speed is very fast, it can reach 11 mbps, meeting personal and social informatization needs.

Third, vendors have a low entry threshold. Manufacturers only need to set up "hot spots" in areas with intensive personnel such as airports, stations, coffee shops and libraries, and connect the Internet to the above sites through express lines. In this way, because the electric waves emitted by "hot spots" can reach a distance from the Access Point radius of dozens of meters to 100 meters, users only need to take the laptop or PDA that Supports Wireless LAN to the area, you can access the Internet at high speed. That is to say, manufacturers do not have to spend money to connect to the network wiring, thus saving a lot of costs.