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Frequently Asked Questions
WiFi
Glossary?
Access point - a device that connects other WiFi devices (computers) together to create WiFi network, acts as a network arbitrator (such as wired switch or hub), allows building larger WiFi networks, can be connected to wired LAN
AES (Advanced Encryption Standard) - DES successor, uses symmetric key ciphering operating on group of bits of a plaintext
Bandwidth - the amount of data that can be transmitted in a fixed amount of time
CCK (Complementary Code Keying) - works only with DSSS, takes advantage of sophisticated mathematical formulas and involves them in DSSS coding, improves security
Connectivity - allow transport of packets between two end points
CSMA/CA (Carrier Sense Multiple Access with Collision Avoidance) - this is a network control protocol in which carrier sensing scheme is used, enables path sharing
DHCP (Dynamic Host Configuration Protocol) - network protocol providing LAN configuration parameters
DSSS (Direct Sequence Spread Spectrum) - a technology of spread spectrum with a direct bits' ranking, while sending data streams are switched over several frequencies and special bits are used
Dual band - combination of two frequency bands, for example 2.4 GHz and 5 GHz, that a device can use simultaneously
FHSS (Frequency Hoping Spread Spectrum) - a technology of spread spectrum with a changeable frequency, data streams are switched over several frequencies
Frequency - number of waves that pass a fixed point in a given unit of time, describes the speed of connection
IR (Infrared) - invisible electromagnetic radiation that enables wireless data sending, its wave's length is about 0.76-2000 microns, discovered in 1800 by F. W. Herschel
MAC filtering - allows to reject network frames sent from given MAC address
MAC layer (Media Access Control Layer) - network layer that recognizes the begin and the end of the bit-stream frames, it inserts the source and the destination (MAC) address to every frame, controls data transfer
Modulation - a way of communication that blends data into carrier signal
OFDM (Orthogonal Frequency Division Multiplexing) - a way of radio data transmitting
Omni-Directional antenna - an antenna that provides sending or receiving radio waves all around
PBCC (Packet Binary Convolutional Coding) - a modulation technology that takes advantage of binary coding sent packets
PSK (phase-shift keying) - phase modulation for digital signals, allows to change electromagnetic carrier to bits (or quaternary digits)
QoS (Quality of Service) - refers the probability of packet passing between two different points in network
Radio band - all radio waves are divided into bands (for example 2.4 GHz or 5 GHz band), each radio device uses one or few band as a connection way to transfer data with other
RadiusAA (Remote Authentication Dial In User Service) - authentication and authorization protocol
Spectrum - the pattern gained from division of sended signal to frequency bands
SSID (Service Set Identifier) - a code describing a part of a WiFi network, all wireless devices must share the same SSID to communicate with each other
TKIP (Temporal Key Integrity Protocol) - security protocol (IEEE 802.11i) replacing WEP, uses a key scheme based on stream-ciphering and encrypts every data packet sent with its own unique encryption key
VPN (Virtual Private Network) - private network communicating over public networks (such as Internet), uses cryptographic tunnelling protocols
WEP (Wired Equivalent Privacy) - a scheme used to secure WiFi, allows wireless connection only after passing a correct key which encryption of the connectivity is
based on
WPA (WiFi Protected Access) - wireless security system distributing different 128-bit key to each user, provides improved payload integrity and security
