Wireless Channel Management Techniques

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Questions and Answers

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. Signup and view all the answers

What are the non-overlapping channels for 2.4GHz WLANs?

1, 6, 11 Signup and view all the answers

How many non-overlapping channels are there for the 5GHz standards 802.11a/n/ac?

3 Signup and view all the answers

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 Signup and view all the answers

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. Signup and view all the answers

What are the threats covered in the WLAN Threats video?

Interception of Data, Wireless Intruders, Denial of Service (DoS) Attacks, Rogue APs Signup and view all the answers

Who are wireless networks specifically susceptible to in terms of generating attacks?

outsiders, disgruntled employees, and even unintentionally by employees Signup and view all the answers

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. Signup and view all the answers

What are the 5GHz channels separated by?

20 MHz Signup and view all the answers

Study Notes

Channel Saturation

Occurs when too many devices try to use the same wireless channel, leading to congestion and slow network performance.
Can be mitigated by using multiple non-overlapping channels, adjusting channel width, and using a different frequency band.

Direct-Sequence Spread Spectrum (DSSS)

Spreads the signal over a wider frequency band, improving resistance to interference and fading.
Used in 802.11b/g standards for WLANs.

Frequency-Hopping Spread Spectrum (FHSS)

Jumps the signal between different frequencies rapidly, reducing interference and making it difficult to jam.
Used in the early 802.11 standard.

Orthogonal Frequency-Division Multiplexing (OFDM)

Divides the signal into multiple sub-carriers, transmitting data simultaneously on each sub-carrier.
Enhances data transmission efficiency by allowing high data rates and mitigating multipath fading.
Used in modern high-speed WLAN standards (802.11a/n/ac).

WLAN Non-Overlapping Channels

2.4 GHz WLANs have 3 non-overlapping channels (1, 6, and 11).
5 GHz 802.11a/n/ac standards have 23 non-overlapping channels.

WLAN User Capacity Factors

Factors affecting the number of users supported by a WLAN include:
- Network bandwidth
- Access point capacity
- Client device capabilities
- Data usage patterns

Circular Coverage Area

The approximate circular coverage area of access points is important for:
- Optimal placement and spacing to ensure good signal coverage.

WLAN Threats

WLANs are vulnerable to attacks such as:
- Unauthorized access
- Eavesdropping
- Denial of service
- Man-in-the-middle attacks

Wireless Network Attackers

Wireless networks are specifically susceptible to attacks by:
- Individuals seeking to exploit vulnerabilities for personal gain.
- Hackers who target wireless networks for malicious purposes.

Primary Vulnerability of WLANs

Primary WLAN vulnerability in terms of access is:
- Lack of network isolation and security mechanisms.

5GHz Channel Separation

5 GHz channels are separated by 20MHz.

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Description

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.