What is the maximum data rate for the 802.11b standard?
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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You have a Cisco mesh network. What protocol allows multiple APs to connect with many redundant connections between nodes?
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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How many non-overlapping channels are available with 802.11h?
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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What is the maximum distance running the lowest data rate for 802.11a?
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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How many non-overlapping channels are available with 802.11b?
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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What is the frequency range of the IEEE 802.11b standard?
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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In Cisco's Unified Wireless Solution, what is the split-MAC architecture?
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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What is the maximum distance with maximum data rate for 802.11b?
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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What is the maximum distance running the lowest data rate for 802.11b?
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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What is the maximum distance with maximum data rate for 802.11g?
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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