In the context of wireless communications, a hotspot (“hot spot”) is a place that provides access to the Internet through a wireless network and a router connected to an Internet service provider .
Usually, hotspots are areas with high traffic demand, and therefore the dimensioning of their coverage is conditioned to cover this demand by one access point or several, and thus provide network services through a provider Wireless Internet Service ( WISP ). The hotspots are in public places such as airports , libraries , convention centers, cafes , hotels , schools, and so on . This service can be covered by Wi-Fi and allows you to stay connected to the InternetIn public places. It can be provided for free or for a fee that depends on the provider.
Devices compatible with Wi-Fi and wireless access allow connecting PDAs , computers, mobile phones and routers , among others.
Summary
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- 1 Frequencies
- 2 Safety
- 3 WPA with hotspotfunctionality
- 4 Android
- 5 Nintendo
- 6 References
- 7 See also
- 8 External links
Frequencies
A Wi-Fi network uses a radio frequency to communicate between the device, the client and the access point, it uses dual-band (or two-way) transmitters that work at 2.4 Ghz ( 802.11b and / or 802.11g ) or 5 Ghz ( 802.11ac ). In general, the range of the antenna varies between 30 and 300 meters between the emitting point and the receiver, depending on the type of antennas used and the power emitted. Despite this, there are many factors that reduce the effective range, such as interference and the physical conditions of the room or in case of outdoors the physical elements.
Security
Because communication is established by electromagnetic waves , the possibility of being cracked or a stranger taking over the network are significant. However, there is WEP and WPA security to prevent data theft. Regardless of the security applied on the wireless link, in a public hotspot it is not important to make a connection. If an encrypted wireless network is used in a hotspot and its code is known, the ease of decrypting the data is the same. A peer-to-peer configuration must be applied in a public hotspot(P2P) in all cases in layer 2 and thus avoid multicast or broadcast between clients. No encryption should be applied to the wireless link and the use of VPNs should be made possible .
WPA with hotspot functionality
Some WPA models can be used as a hotspot and support one level of authentication using RADIUS and other authentication servers.
The latest models use second and third generation levels of encryption, since the first generation of WEP encryption was quite easy to crack.
These new levels of encryption, both WPA and WPA2 , are considered secure if the password is strong enough or if “passphrase” is used.
Android
The Android operating system supports this feature since version 2.2 Froyo . [1] Previously it could be used in devices Rooted using application iptables of Linux .
