Wireless Frequencies (obj 2.3)

Question 1

What are Wireless Frequencies?

Answer 1

Different frequency bands used to transmit and receive radio waves in wireless networks

Each frequency band has specific characteristics related to speed, coverage, and regulations to prevent interference.

Question 2

What is the frequency range of the 2.4 GHz Band?

Answer 2

2.400 GHz to 2.495 GHz

Widely used since 1997, it offers long-range and better penetration through solid objects.

Question 3

What is a major issue with channels in the 2.4 GHz Band?

Answer 3

Channels overlap, causing interference

Up to channel 11 to 14 are affected.

Question 4

What are the characteristics of the 5 GHz Band?

Answer 4

Faster data transfer speeds with shorter range compared to 2.4 GHz

Contains frequencies from 5.7 GHz to 5.875 GHz, providing up to 24 non-overlapping channels.

Question 5

Which channels in the 5 GHz Band do not overlap and are advisable for use?

Answer 5

• Channel 1
• Channel 6
• Channel 11

These channels help avoid interference.

Question 6

What is Channel Bonding?

Answer 6

Creates a wider channel by merging two or more neighboring channels into a single wider channel

Increases bandwidth but becomes more susceptible to interference.

Question 7

What is the frequency range of the 6 GHz Band?

Answer 7

5.925 GHz to 7.125 GHz

Offers faster connections with less congestion and accommodates up to 59 channels.

Question 8

What does the 802.11h Standard include?

Answer 8

• Dynamic Frequency Selection (DFS)
• Transmit Power Control (TPC)

Developed to comply with European regulations.

Question 9

What is Dynamic Frequency Selection (DFS)?

Answer 9

Requires devices to actively monitor the environment for radar signals

This helps avoid interference with radar systems.

Question 10

What is Transmit Power Control (TPC)?

Answer 10

Allows devices to adjust their transmitting power to the minimum required for maintaining a good quality connection

This optimizes energy usage and minimizes interference.

Question 11

What is Band Steering?

Answer 11

Technology that optimizes the distribution of client devices across different frequency bands

Relevant for environments where two or more frequency bands are being utilized.

Question 12

What are the comparative speeds and coverage of the frequency bands?

Answer 12

• 2.4 GHz – slower speeds but greater coverage
• 5 GHz – faster speeds with shorter range
• 6 GHz – fastest speeds but shortest distances

6 GHz also has less solid object penetration.