Wireless Technologies Questions and Answers

Q: For the IEEE 802.11 MAC protocol for wireless communication, which of the following statements is/are TRUE?I. At least three non-overlapping channels are available for transmissions.II. The RTS-CTS mechanism is used for collision detection.III. Unicast frames are ACKed.

The true statements are I and III only.I is true: in the 2.4 GHz band, channels 1, 6 and 11 do not overlap, so at least three non-overlapping channels are available (and many more at 5 GHz).III is true: 802.11 uses a stop-and-wait acknowledgement at the MAC layer, so every unicast data frame received correctly is ACKed; broadcast frames are not.II is false: a wireless station cannot reliably detect collisions while transmitting, so 802.11 uses CSMA/CA, collision avoidance. The RTS-CTS exchange reserves the medium to avoid collisions, notably from hidden terminals; it does not detect them. That rules out every option containing II.

Q: In wireless networks CDPD stands for ................. .

CDPD stands for Cellular Digital Packet Data.CDPD was a wireless data service that sent digital packets over idle channels of the AMPS analogue cellular network, letting mobile users connect to IP networks.The other expansions are invented; in particular CDPD involves no collision detection, and its last word is 'Data', not 'Distribution'.

Q: Bluetooth is an example of :

Bluetooth is an example of a personal area network.A personal area network connects devices around one person, over distances of roughly 10 m: a phone with headphones, a watch, a keyboard or a car system. Bluetooth (originally IEEE 802.15.1) is the best-known wireless PAN technology, operating in the 2.4 GHz band.A local area network covers a building or campus, as Wi-Fi and Ethernet do. A wide area network spans cities or countries. A virtual private network is a secure tunnel over another network such as the internet, not a type of short-range link.

Q: Which of the following is most commonly used IOT standards for Medium Access Control (MAC) ?

The most commonly used IoT MAC standard is IEEE 802.15.4.IEEE 802.15.4 defines the physical and medium access control layers for low-rate, low-power wireless personal area networks. It is the foundation of Zigbee, 6LoWPAN, Thread and WirelessHART, which makes it the most widely used MAC standard in IoT sensor networks.IEEE 802.11ah (Wi-Fi HaLow) is a newer, sub-1 GHz Wi-Fi standard for IoT with far less deployment. IEEE 2413 is an architectural framework for IoT, not a MAC standard. IEEE 11073 is a family of standards for communication between personal health devices.

Q: How many non-overlapping channels are available with 802.11g?

Correct answer: 3802.11g shares the 2.4 GHz band with 802.11b and so shares its channel plan: eleven overlapping channels of which only 1, 6 and 11 can be used together. The higher data rate changes nothing about the spectrum available, which is why 802.11a’s twelve channels remain its principal advantage.

Q: What is the maximum data rate for the 802.11a standard?

Correct answer: 54Mbps802.11a reaches 54 Mbps, the same headline rate as 802.11g. The two differ in band rather than in speed - 5 GHz against 2.4 - which is why 802.11a offers more non-overlapping channels and less interference but a shorter range.

Q: What is the maximum distance with maximum data rate for 802.11a?

Correct answer: About 65-75 feet802.11a reaches only about 65 to 75 feet at its full 54 Mbps. It is the shortest range of the three standards here, because 5 GHz signals attenuate more rapidly in air and are absorbed more readily by walls and furnishings than 2.4 GHz. That is the price paid for the extra channels and the quieter band.

Q: How many non-overlapping channels are available with 802.11a?

Correct answer: 12802.11a has twelve non-overlapping channels in the 5 GHz U-NII bands, four times what 2.4 GHz offers. The channels there are spaced so they do not overlap at all, which makes the channel plan for a dense deployment far easier and is the main practical reason for choosing 5 GHz.

Which of the given options best describes the truthfulness of the following statements? i) Service Set Identification (SSID) is human readable text string with a maximum length of 2000 bytes. ii) Service Set Identification (SSID) acts as a single shared identifier between the access points and clients.

A.i-True, ii-True
B.i-False, ii-True
C.i-True, ii-False
D.i-False, ii-False

Exam Year(s)

DSSSB TGT - 2023,

Answer: B

Statement i is false and statement ii is true. An SSID is a human-readable text string, but its maximum length is 32 bytes, not 2000 bytes. The SSID acts as a single shared identifier between the access points and the clients of a wireless network. So the second option, i-False and ii-True, is correct, and the options that call i true are wrong. The 32-byte limit is the same figure that is given for the SSID in the standard for wireless networks.

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For the IEEE 802.11 MAC protocol for wireless communication, which of the following statements is/are TRUE?

I. At least three non-overlapping channels are available for transmissions.
II. The RTS-CTS mechanism is used for collision detection.
III. Unicast frames are ACKed.

A.All I, II, and III
B.I and III only
C.II and III only
D.II only

Exam Year(s)

GATE CS - 2016,

Answer: B

The true statements are I and III only.

I is true: in the 2.4 GHz band, channels 1, 6 and 11 do not overlap, so at least three non-overlapping channels are available (and many more at 5 GHz).

III is true: 802.11 uses a stop-and-wait acknowledgement at the MAC layer, so every unicast data frame received correctly is ACKed; broadcast frames are not.

II is false: a wireless station cannot reliably detect collisions while transmitting, so 802.11 uses CSMA/CA, collision avoidance. The RTS-CTS exchange reserves the medium to avoid collisions, notably from hidden terminals; it does not detect them. That rules out every option containing II.

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In wireless networks CDPD stands for ................. .

A.Carrier Data Packet Data
B.Collision Detection in Packet Data
C.Cellular Digital Packet Distribution
D.Cellular Digital Packet Data

Exam Year(s)

MH SET - 2024, SET Exam - 2024,

Answer: D

CDPD stands for Cellular Digital Packet Data.

CDPD was a wireless data service that sent digital packets over idle channels of the AMPS analogue cellular network, letting mobile users connect to IP networks.

The other expansions are invented; in particular CDPD involves no collision detection, and its last word is 'Data', not 'Distribution'.

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Bluetooth is an example of :

A.Wide area network
B.Virtual private network
C.Local area network
D.Personal area network

Exam Year(s)

MH SET - 2025, SET Exam - 2025,

Answer: D

Bluetooth is an example of a personal area network.

A personal area network connects devices around one person, over distances of roughly 10 m: a phone with headphones, a watch, a keyboard or a car system. Bluetooth (originally IEEE 802.15.1) is the best-known wireless PAN technology, operating in the 2.4 GHz band.

A local area network covers a building or campus, as Wi-Fi and Ethernet do. A wide area network spans cities or countries. A virtual private network is a secure tunnel over another network such as the internet, not a type of short-range link.

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Which of the following is most commonly used IOT standards for Medium Access Control (MAC) ?

A.IEEE802.15.4
B.IEEE802.11ah
C.IEEE 2413
D.IEEE11073

Exam Year(s)

MH SET - 2025, SET Exam - 2025,

Answer: A

The most commonly used IoT MAC standard is IEEE 802.15.4.

IEEE 802.15.4 defines the physical and medium access control layers for low-rate, low-power wireless personal area networks. It is the foundation of Zigbee, 6LoWPAN, Thread and WirelessHART, which makes it the most widely used MAC standard in IoT sensor networks.

IEEE 802.11ah (Wi-Fi HaLow) is a newer, sub-1 GHz Wi-Fi standard for IoT with far less deployment. IEEE 2413 is an architectural framework for IoT, not a MAC standard. IEEE 11073 is a family of standards for communication between personal health devices.

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How many non-overlapping channels are available with 802.11g?

A.3
B.12
C.23
D.40

Answer: A

Correct answer: 3

802.11g shares the 2.4 GHz band with 802.11b and so shares its channel plan: eleven overlapping channels of which only 1, 6 and 11 can be used together. The higher data rate changes nothing about the spectrum available, which is why 802.11a’s twelve channels remain its principal advantage.

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Cisco's Unified Wireless Solution provides a mesh solution. What devices do you absolutely need to purchase to run a Cisco solution?

1.WCS

2.Controller

3.Access point

4.Bridge

A.1 and 2
B.2 and 3
C.1 and 4 only
D.4 only

Answer: B

The Cisco Unified Wireless Solution is a great product, but you must purchase specialized devices. Cisco managed access points and a controller are the devices you need to purchase to run the Unified Wireless Solution.

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What is the maximum data rate for the 802.11a standard?

A.6Mbps
B.11Mbps
C.22Mbps
D.54Mbps

Answer: D

Correct answer: 54Mbps

802.11a reaches 54 Mbps, the same headline rate as 802.11g. The two differ in band rather than in speed - 5 GHz against 2.4 - which is why 802.11a offers more non-overlapping channels and less interference but a shorter range.

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What is the maximum distance with maximum data rate for 802.11a?

A.About 65-75 feet
B.About 90-100 feet
C.About 150 feet
D.Over 200 feet

Answer: A

Correct answer: About 65-75 feet

802.11a reaches only about 65 to 75 feet at its full 54 Mbps. It is the shortest range of the three standards here, because 5 GHz signals attenuate more rapidly in air and are absorbed more readily by walls and furnishings than 2.4 GHz. That is the price paid for the extra channels and the quieter band.

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10.

How many non-overlapping channels are available with 802.11a?

A.3
B.12
C.23
D.40

Answer: B

Correct answer: 12

802.11a has twelve non-overlapping channels in the 5 GHz U-NII bands, four times what 2.4 GHz offers. The channels there are spaced so they do not overlap at all, which makes the channel plan for a dense deployment far easier and is the main practical reason for choosing 5 GHz.

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