12 Questions
What is channel saturation and how can it be mitigated?
Channel saturation occurs when the demand for a specific wireless channel is too high, degrading the quality of communication. It can be mitigated using techniques that use the channels more efficiently.
Explain the purpose of Direct-Sequence Spread Spectrum (DSSS) in wireless communication.
DSSS is a modulation technique designed to spread a signal over a larger frequency band, used by 802.11b devices to avoid interference from other devices using the same 2.4 GHz frequency.
What is the role of Frequency-Hopping Spread Spectrum (FHSS) in wireless communication?
FHSS transmits radio signals by rapidly switching a carrier signal among many frequency channels. The sender and receiver must be synchronized to 'know' which channel to jump to.
How does Orthogonal Frequency-Division Multiplexing (OFDM) contribute to communication systems?
OFDM is a subset of frequency division multiplexing in which a single channel uses multiple sub-channels on adjacent frequencies. It is used by a number of communication systems including 802.11a/g/n/ac.
What are the non-overlapping channels for 2.4GHz WLANs?
1, 6, 11
How many non-overlapping channels are there for the 5GHz standards 802.11a/n/ac?
3
What factors determine the number of users supported by a WLAN?
geographical layout, number of bodies and devices, data rates, use of non-overlapping channels, and transmit power settings
Why is the approximate circular coverage area important when planning the location of APs?
It helps to determine the effective coverage and placement of access points.
What are the threats covered in the WLAN Threats video?
Interception of Data, Wireless Intruders, Denial of Service (DoS) Attacks, Rogue APs
Who are wireless networks specifically susceptible to in terms of generating attacks?
outsiders, disgruntled employees, and even unintentionally by employees
What is the primary vulnerability of a WLAN in terms of access?
It is open to anyone within range of an AP and the appropriate credentials to associate to it.
What are the 5GHz channels separated by?
20 MHz
Learn about wireless channel management and techniques to mitigate channel saturation. This includes understanding the impact of high demand on communication quality and how to use channels more efficiently.
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