Wireless Technologies Questions and Answers

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

Correct answer: 5GHz802.11a operates in the 5 GHz U-NII bands. Note that two of the options are given in Gbps - a data rate, not a frequency - so they can be eliminated on units alone before any knowledge of the standard is applied. The move to 5 GHz is what gives 802.11a its twelve non-overlapping channels and its shorter range, since higher frequencies attenuate faster.

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

Correct answer: 11Mbps802.11b reaches 11 Mbps, with fallback rates of 5.5, 2 and 1 Mbps as the signal weakens. It is the slowest of the three standards here and the longest ranging, which is the same trade-off seen throughout this topic - a more robust modulation carries less data but survives a weaker signal.

Q: You have a Cisco mesh network. What protocol allows multiple APs to connect with many redundant connections between nodes?

Correct answer: AWPPThe Adaptive Wireless Path Protocol is Cisco’s proprietary mesh routing protocol. Each mesh access point uses it to discover its neighbours and choose the best path back to the rooted access point, taking signal quality and the number of hops into account, and to reroute automatically when a link degrades. LWAPP is the protocol between a lightweight access point and its controller, and STP is a wired Layer 2 protocol.

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.

21.

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

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

Answer: D

Correct answer: 5GHz

802.11a operates in the 5 GHz U-NII bands. Note that two of the options are given in Gbps - a data rate, not a frequency - so they can be eliminated on units alone before any knowledge of the standard is applied. The move to 5 GHz is what gives 802.11a its twelve non-overlapping channels and its shorter range, since higher frequencies attenuate faster.

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22.

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

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

Answer: B

Correct answer: 11Mbps

802.11b reaches 11 Mbps, with fallback rates of 5.5, 2 and 1 Mbps as the signal weakens. It is the slowest of the three standards here and the longest ranging, which is the same trade-off seen throughout this topic - a more robust modulation carries less data but survives a weaker signal.

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23.

You have a Cisco mesh network. What protocol allows multiple APs to connect with many redundant connections between nodes?

A.LWAPP
B.AWPP
C.STP
D.IEEE

Answer: B

Correct answer: AWPP

The Adaptive Wireless Path Protocol is Cisco’s proprietary mesh routing protocol. Each mesh access point uses it to discover its neighbours and choose the best path back to the rooted access point, taking signal quality and the number of hops into account, and to reroute automatically when a link degrades. LWAPP is the protocol between a lightweight access point and its controller, and STP is a wired Layer 2 protocol.

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24.

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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25.

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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26.

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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27.

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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28.

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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29.

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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30.

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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