Wireless Technologies Questions and Answers

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

Correct answer: 23802.11h extends 802.11a with dynamic frequency selection and transmit power control, which allow the additional 5 GHz channels reserved for radar to be used safely. That takes the count from twelve to twenty-three. The amendment was written for European regulatory requirements and is what made the extended band usable at all.

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

Correct answer: About 175 feetAt its lowest rate 802.11a reaches about 175 feet - half the 350 feet of 802.11b at its lowest rate. The pattern holds at every rate: for the same modulation, the 5 GHz signal covers roughly half the distance of the 2.4 GHz one.

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

Correct answer: 3The 2.4 GHz band holds eleven channels in North America but each is 22 MHz wide against a 5 MHz spacing, so adjacent channels overlap heavily. Only channels 1, 6 and 11 are far enough apart not to interfere. That figure of three is the fundamental constraint on 2.4 GHz deployment: cells must be laid out so that no two neighbours share a channel.

Q: What is the frequency range of the IEEE 802.11b standard?

Correct answer: 2.4GHz802.11b uses the 2.4 GHz ISM band, which it shares with 802.11g, Bluetooth, cordless telephones and microwave ovens - the source of most of the interference that band suffers. As with the 802.11a item, the two options quoted in Gbps are rates rather than frequencies and can be discarded on units.

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

Correct answer: About 150 feet802.11b reaches about 150 feet at its maximum 11 Mbps. It has the longest full-rate range of the three, because its low data rate uses a robust modulation that tolerates a weaker signal - and because 2.4 GHz penetrates obstacles better than 5 GHz.

Q: What is the maximum distance running the lowest data rate for 802.11b?

Correct answer: About 350 feetAt its lowest rate of 1 Mbps, 802.11b reaches about 350 feet. Range and rate trade against each other continuously: as a client moves away the signal weakens, the radio falls back to a more robust modulation, and the throughput drops. The 150 feet quoted elsewhere in this topic is the distance at the full 11 Mbps.

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

Correct answer: About 90-100 feet802.11g reaches about 90 to 100 feet at 54 Mbps. It sits between the other two: better than 802.11a’s 65 to 75 feet because 2.4 GHz propagates further, but well short of 802.11b’s 150 feet because holding 54 Mbps demands a much stronger signal than holding 11.

Q: What is the maximum distance running the lowest data rate for 802.11g?

Correct answer: About 300 feetAt its lowest rate 802.11g reaches about 300 feet, a little short of 802.11b’s 350. The two share a band, so the difference lies in the modulation each falls back to rather than in propagation, and the ordering of the three standards is the same at every rate: b furthest, g next, a shortest.

11.

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

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

Answer: C

Correct answer: 23

802.11h extends 802.11a with dynamic frequency selection and transmit power control, which allow the additional 5 GHz channels reserved for radar to be used safely. That takes the count from twelve to twenty-three. The amendment was written for European regulatory requirements and is what made the extended band usable at all.

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12.

What is the maximum distance running the lowest data rate for 802.11a?

A.About 100 feet
B.About 175 feet
C.About 300 feet
D.About 350 feet

Answer: B

Correct answer: About 175 feet

At its lowest rate 802.11a reaches about 175 feet - half the 350 feet of 802.11b at its lowest rate. The pattern holds at every rate: for the same modulation, the 5 GHz signal covers roughly half the distance of the 2.4 GHz one.

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13.

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

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

Answer: A

Correct answer: 3

The 2.4 GHz band holds eleven channels in North America but each is 22 MHz wide against a 5 MHz spacing, so adjacent channels overlap heavily. Only channels 1, 6 and 11 are far enough apart not to interfere. That figure of three is the fundamental constraint on 2.4 GHz deployment: cells must be laid out so that no two neighbours share a channel.

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14.

What is the frequency range of the IEEE 802.11b standard?

A.2.4Gbps
B.5Gbps
C.2.4GHz
D.5GHz

Answer: C

Correct answer: 2.4GHz

802.11b uses the 2.4 GHz ISM band, which it shares with 802.11g, Bluetooth, cordless telephones and microwave ovens - the source of most of the interference that band suffers. As with the 802.11a item, the two options quoted in Gbps are rates rather than frequencies and can be discarded on units.

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15.

In Cisco's Unified Wireless Solution, what is the split-MAC architecture?

A.The split-MAC architecture uses MAC addresses to create a forward/filter table and break up collision domains.
B.The split-MAC architecture allows the splitting of 802.11 protocol packets between the AP and the controller to allow processing by both devices.
C.The split-MAC architecture uses MAC addresses on the wireless network and IP addresses on the wired network.
D.The split-MAC architecture uses MAC addresses to create a forward/filter table and break up broadcast domains.

Answer: B

The split-MAC architecture allows the splitting of 802.11 protocol packets between the Cisco LWAPP-based AP, which handles real-time portions of the protocol, and the WLAN controller, which handles those items that are not time sensitive.

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16.

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

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

Answer: C

Correct answer: About 150 feet

802.11b reaches about 150 feet at its maximum 11 Mbps. It has the longest full-rate range of the three, because its low data rate uses a robust modulation that tolerates a weaker signal - and because 2.4 GHz penetrates obstacles better than 5 GHz.

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17.

What is the maximum distance running the lowest data rate for 802.11b?

A.About 100 feet
B.About 175 feet
C.About 300 feet
D.About 350 feet

Answer: D

Correct answer: About 350 feet

At its lowest rate of 1 Mbps, 802.11b reaches about 350 feet. Range and rate trade against each other continuously: as a client moves away the signal weakens, the radio falls back to a more robust modulation, and the throughput drops. The 150 feet quoted elsewhere in this topic is the distance at the full 11 Mbps.

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18.

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

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

Answer: B

Correct answer: About 90-100 feet

802.11g reaches about 90 to 100 feet at 54 Mbps. It sits between the other two: better than 802.11a’s 65 to 75 feet because 2.4 GHz propagates further, but well short of 802.11b’s 150 feet because holding 54 Mbps demands a much stronger signal than holding 11.

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19.

What is the maximum distance running the lowest data rate for 802.11g?

A.About 100 feet
B.About 175 feet
C.About 300 feet
D.About 350 feet

Answer: C

Correct answer: About 300 feet

At its lowest rate 802.11g reaches about 300 feet, a little short of 802.11b’s 350. The two share a band, so the difference lies in the modulation each falls back to rather than in propagation, and the ordering of the three standards is the same at every rate: b furthest, g next, a shortest.

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20.

You are connecting your access point and it is set to root. What does Extended Service Set ID mean?

A.That you have more than one access point and they are in the same SSID connected by a distribution system.
B.That you have more than one access point and they are in separate SSIDs connected by a distribution system.
C.That you have multiple access points, but they are placed physically in different buildings.
D.That you have multiple access points, but one is a repeater access point.

Answer: A

Correct answer: That you have more than one access point and they are in the same SSID connected by a distribution system.

An Extended Service Set joins two or more basic service sets under one SSID, linked by a distribution system - usually the wired network. Because the SSID is shared, a client can roam between the access points without reassociating to a different network. Separate SSIDs would be separate networks, and the physical placement of the access points is not what defines the term.

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