Wi-Fi 6E

What WiFi standard could possibly use 6 Ghz in the US?

Wi-Fi 6E is the WiFi standard that could possibly use 6 GHz in the US. The document mentions that 802.11ax (Wi-Fi 6) has preliminary support for additional frequency bands in the 6-7 GHz range, pending final FCC approval in the US. This indicates that Wi-Fi 6E, which operates in the 6 GHz frequency band, could be the standard that utilizes the 6 GHz spectrum in the US.

  1. 112

The hidden node problem has been addressed by using special WiFi access points., True or False?

Answer:

False.

The given document does not mention that the hidden node problem has been addressed by using special WiFi access points. It only mentions that the hidden-node problem can occur in scenarios where nodes cannot receive each other’s transmissions due to physical obstructions or other factors. It also mentions that one of the rationales for the RTS/CTS protocol is the prevention of hidden-node collisions. However, there is no mention of special WiFi access points being used to address the hidden node problem.

 

Band Width is the same as Bandwidth

  1. True b. False

Answer: False

Band Width is not the same as Bandwidth. In the context of computer networks, “band width” refers to the frequency range used by a signal, while “bandwidth” refers to the data transmission rate. Bandwidth is proportional to the channel width, which is the frequency range used by the signal. Therefore, the terms “band width” and “bandwidth” have different meanings in the context of computer networks.

  1. 106

The hidden node problem has been addressed by using special WiFi access points.

  1. True
  2. False

Answer:

False

The given document does not mention that the hidden node problem has been addressed by using special WiFi access points. It only mentions that the hidden-node problem can occur in wireless networks when nodes cannot receive each other’s transmissions due to physical obstructions or other factors. It does not provide any information about special WiFi access points being used to address this problem.

  1. 115

What channels can be used to avoid overlapping interference in the 2.4 Ghz band?

Channels to Avoid Overlapping Interference in the 2.4 GHz Band

In the 2.4 GHz band, Wi-Fi use is often restricted to official channels 1, 6, and 11 to avoid signal overlap and interference. These channels are designated by international agreement and are about 5 MHz wide each. By limiting Wi-Fi use to these channels, it helps reduce the chances of overlapping interference from other Wi-Fi transmitters. Therefore, to avoid signal overlap and interference in the 2.4 GHz band, it is recommended to use channels 1, 6, or 11.

  1. 111 (28-43)p. 111 (1-27)

From the list below, put the WiFi standards in chronological order…

802.11n

802.11b

802.11ax

802.11ac

802.11g

802.11a

WiFi Standards in Chronological Order:

  1. 802.11a: This was the first WiFi standard introduced, operating in the 5 GHz frequency band and offering a maximum bit rate of 54 Mbps.
  2. 802.11b: This standard came after 802.11a and operated in the 2.4 GHz frequency band. It offered a maximum bit rate of 11 Mbps.
  3. 802.11g: Introduced after 802.11b, this standard also operated in the 2.4 GHz frequency band and provided a maximum bit rate of 54 Mbps.
  4. 802.11n: This standard brought significant improvements in terms of speed and range. It operated in both the 2.4 GHz and 5 GHz frequency bands and offered a maximum bit rate of 65-150 Mbps.
  5. 802.11ac: This standard operates exclusively in the 5 GHz frequency band and provides faster speeds compared to previous standards. It offers a maximum bit rate of 78-867 Mbps.
  6. 802.11ax: This is the latest WiFi standard, also known as WiFi 6. It operates in both the 2.4 GHz and 5 GHz frequency bands and offers improved performance and efficiency. It can provide speeds of up to 1200 Mbps.

So, the chronological order of the WiFi standards is: 802.11a, 802.11b, 802.11g, 802.11n, 802.11ac, 802.11ax.

  1. 111 (1-27)p. 112p. 111 (28-43)

Match the WiFi standard to the maximum channel width

802.11ax

802.11a

802.11g

802.11ac

802.11b

802.11n

802.11ax: The maximum channel width for 802.11ax is 20-160 MHz.

802.11a: The maximum channel width for 802.11a is 20 MHz.

802.11g: The maximum channel width for 802.11g is 20 MHz.

802.11ac: The maximum channel width for 802.11ac is 20-160 MHz.

802.11b: The maximum channel width for 802.11b is 20 MHz.

802.11n: The maximum channel width for 802.11n is 20-40 MHz.

  1. 112p. 111

Are Collisions are a part of WiFi?

Collisions in Wi-Fi

Collisions are indeed a part of Wi-Fi networks. Unlike Ethernet, where collisions are rapidly becoming a thing of the past with the use of switches and full-duplex links, Wi-Fi has brought collisions back into the picture. Wi-Fi transmitting stations cannot detect collisions in progress, which means that if another station transmits at the same time, a Wi-Fi sender will not be able to detect it. However, collisions in Wi-Fi are a local phenomenon and occur at the receiver. This means that two stations can transmit at the same time without a collision if each receiver is only in range of one of the transmitting stations.

  1. 106p. 105

Put the stages in the correct order corresponding to the process a WiFi client goes through in joining a network…

Scanning

Open-authentication and association

True authentication

DHCP

Stages in the process a WiFi client goes through in joining a network:

  1. Scanning: The WiFi client scans for available networks by listening for beacon packets that are periodically broadcasted by access points. This allows the client to discover nearby networks and their SSIDs.
  2. Open-authentication and association: Once the client has identified the desired network, it initiates an open-authentication process by sending an authentication request to the access point. The access point responds with an association response, establishing a connection between the client and the access point.
  3. True authentication: After the open-authentication and association, the client proceeds with true authentication. This involves a challenge-response exchange between the client and the access point to verify the client’s identity and establish secure communication.
  4. DHCP (Dynamic Host Configuration Protocol): Once the client has successfully authenticated, it uses DHCP to obtain an IP address from the network. This allows the client to join the network and communicate with other devices.

So, the correct order of stages in the process a WiFi client goes through in joining a network is:

  1. Scanning
  2. Open-authentication and association
  3. True authentication
  4. DHCP
  1. 120p. 122

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