What is IEEE 802.11 and how does it work?
IEEE 802.11 refers to the set of standards that define communication for wireless LANs (wireless local area networks, or WLANs). The technology behind 802.11 is branded to consumers as Wi-Fi. As the name implies, IEEE 802.11 is overseen by the IEEE, specifically the IEEE LAN/MAN Standards Committee (IEEE 802).
What is the IEEE 802.11 standard used for?
IEEE 802.11 is used in most home and office networks to allow laptops, printers, smartphones, and other devices to communicate with each other and access the Internet without connecting wires.
What are the features of IEEE 802.11 standard?
802.11a Protocol Features
- 802.11a uses 5GHz frequency band which is less crowded and hence has relatively smaller interference problem.
- 802.11a supports up to 54Mbps of bandwidth, which is much faster than the 11Mbps bandwidth provided by 802.11b standard devices.
- 802.11a offers as many as 12 non-overlapping channels.
What are two characteristics of 802.11 wireless networks?
What are two characteristics of 802.11 wireless networks? (Choose…
- Stations can transmit at any time.
- They use CSMA/CA technology.
- They are collision-free networks.
- They use CSMA/CD technology.
- Collisions can exist in the networks.
What is the frequency range of IEEE 802.11 a standard?
Operates in the 5 GHz frequency range (5.125 to 5.85 GHz) with a maximum 54 Mbps signaling rate.
What is PHY in Wi-Fi?
The physical layer (PHY) rate. It is the maximum speed that data can move across a wireless link between a wireless client and a wireless router.
How many channels does 802.11 have?
802.11a Channels As I mentioned previously, 802.11b (and 802.11g) networks offer 11 channels, but only three channels (1,6, and 11) do not overlap with each other.
What is maximum link rate?
Link Rates: The most common 11n maximum link rates are 150 Mbps and 300 Mbps. In some new 11n products, more antennas are added so they can support up to 450 Mbps. The link rate is directly related to wireless signal strength.
What is the basic access mechanism used in IEEE 802.11 WLAN?
DCF is the fundamental MAC protocol of the IEEE 802.11 based WLAN standard. It adopts the CSMA/CA with Binary Exponential Backoff (BEB) algorithm, along with two access mechanisms, a two-way handshaking scheme called basic access and a four-way handshaking scheme called request- to-send/clear-to-send (RTS/CTS) access.
What is the IEEE standard for WLAN?
†In 1997, the IEEE adopted the first standard for WLANs and revised in 1999. †IEEE defines a MAC sublayer, MAC management protocols and services, and three physical (PHY) layers. †PHY Layers: 1. IR at baseband with 1-2 Mbps, 2.
What is the IEEE 802 PHY extension?
In October 1997 the IEEE 802 Executive Committee approved two projects to for higher rate physical layer (PHY) extensions to IEEE 802.11. The first extension, IEEE 802.11a, defines requirements for a PHY operating in the 5.0 GHz U-NII frequency and data rates ranging from 6 Mbps to 54 Mbps.
How many PHYs are there in the 80211 protocol?
As any 802.x protocol, the 802.11 protocol covers the MAC and Physical Layer. The Standard currently defines a single MAC which interacts with three PHYs (all of them running at 1 and 2 Mbit/s) as follows: n Frequency Hopping Spread Spectrum in the 2.4 GHz Band n Direct Sequence Spread Spectrum in the 2.4 GHz Band, and n InfraRed
Which encryption algorithm is used in IEEE 802 1111?
The encryption algorithm used in IEEE 802.11 is RC4 developed by Ron Rivest of RSA Data Security, Inc. RC4 is a symmetric stream cipher that supports a variable key length (IEEE 802.11 chosen 40 bit key length). It is symmetric since the same key and algorithm are used for both encryption and decryption. Unlike 26