11.5.1 Wireless Networking

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Questions and Answers

Which frequency band is utilized by the WiMax long-range wireless standard?

3.65 GHz (correct)

2.4 GHz

5 GHz

900 MHz

What is a potential consequence of excessively increasing an access point's power?

Interference with other wireless devices (correct)

Extended wireless range with no issues

Reduction in power consumption

Improved connection speed

What is the primary characteristic of unbounded media used in wireless networks?

Signals travel further compared to bounded media.

Signals are sent through the air without physical confinement. (correct)

Signals have a higher likelihood of interference.

Signals are encased in a protective sheath.

What are the two most common frequency ranges used in wireless networks in the United States?

2.4 GHz and 5 GHz Signup and view all the answers

How does the wave frequency affect the data transfer rate in wireless networks?

Lower frequencies can provide a longer range but have slower data transfer rates. Signup and view all the answers

What issue might arise if a wireless network is operating at 2.4 GHz while a microwave is in use?

The network signal may be disrupted. Signup and view all the answers

What does changing the channel in a wireless network accomplish?

It allows for adjustment of the frequency to avoid interference. Signup and view all the answers

What limitation exists with the 2.4 GHz frequency channels?

Channels overlap significantly, limiting effective usage. Signup and view all the answers

What is a consequence of using unlicensed frequency ranges for wireless networks?

Multiple devices can cause interference on these frequencies. Signup and view all the answers

Which feature of wireless routers helps mitigate the issue of interference?

Channel selection settings. Signup and view all the answers

What are the only non-overlapping channels in the 2.4 GHz range?

1, 6, 11 Signup and view all the answers

Which standard operates in the 5 GHz range and provides a maximum data rate of 54 Mbps?

802.11a Signup and view all the answers

What is one advantage of the 802.11n standard over its predecessors?

It can use both the 2.4 GHz and 5 GHz frequencies. Signup and view all the answers

Which of the following features is introduced with the 802.11n standard?

Multiple Input, Multiple Output (MIMO) Signup and view all the answers

What does MU-MIMO enable compared to traditional MIMO?

Simultaneous data transmission to multiple devices. Signup and view all the answers

Which standard achieves a theoretical maximum speed of 14 Gbps?

802.11ax Signup and view all the answers

Which technology involves combining two non-overlapping channels to increase data transfer rates?

Channel bonding Signup and view all the answers

How many non-overlapping channels are available in the 5 GHz range?

24 Signup and view all the answers

What does beamforming accomplish in wireless networking?

Focuses transmissions to specific receivers. Signup and view all the answers

What is the maximum theoretical speed of the 802.11ac standard?

2.6 Gbps Signup and view all the answers

What is a significant limitation that affects the range of wireless signals indoors?

Barriers like walls Signup and view all the answers

Which standard utilizes both MIMO and channel bonding to enhance performance?

802.11ac Signup and view all the answers

To connect two buildings that are a short distance apart using wireless technology, which option is recommended?

High-end wireless access point with a special antenna Signup and view all the answers

Study Notes

Wireless Networking Overview

Wireless networks use radio waves to transmit data.
Radio waves are an unbounded medium, allowing for more flexibility compared to cables.
Common radio frequencies used in the United States are regulated by the FCC.
2.4 GHz: Wider waves, longer range, slower data transfer.
5 GHz: Thinner waves, shorter range, faster data transfer.
These frequencies are unlicensed, allowing for interference from other devices (e.g., microwaves operating at 2.45 GHz).
Changing channels allows for tuning the frequency to reduce interference.

Wireless Standards

IEEE 802.11 standards define how wireless frequencies are used.
802.11a: Operates at 5 GHz, transmits data at 54 Mbps, range up to 100 feet.
802.11b: Operates at 2.4 GHz, transmits data at 11 Mbps, range up to 150 feet.
802.11g: Operates at 2.4 GHz, combines the best of 802.11a and 802.11b, transmits data at 54 Mbps, range up to 150 feet.
802.11n: Transmits data at 600 Mbps, range up to 300 feet, supports both 2.4 GHz and 5 GHz frequencies, introduces MIMO.
MIMO (Multiple Input, Multiple Output): Uses additional transmit and receive radios for faster data transfer.
MU-MIMO (Multi-User MIMO): Allows antennas to divide streams between multiple devices, using beamforming to focus transmissions.
Channel Bonding: Combining non-overlapping channels to increase speed.
802.11ac (Wi-Fi 5): Uses MIMO and channel bonding to achieve speeds up to 2.6 Gbps, range up to 300 feet.
802.11ax (Wi-Fi 6): Operates at 5 GHz, further enhances MIMO, channel bonding, and other technologies to achieve theoretical speeds up to 14 Gbps, range up to 300 feet.

Long Range Wireless Networks

For short distances, high-end wireless access points with special antennas can be used.
For longer distances, licensed frequencies like 900 MHz or 3.65 GHz are required.
WiMax operates at 3.65 GHz.
Increasing the power of the access point can extend range but requires following FCC guidelines to avoid interference.

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Description

This quiz covers the fundamentals of wireless networking, including how radio waves transmit data and the impacts of frequency on performance. It also explores the various IEEE 802.11 standards that govern wireless communication. Test your knowledge on these crucial aspects of wireless technology.