Wireless Technologies Questions and Answers

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

Correct answer: 2.4GHz802.11g operates at 2.4 GHz, the same band as 802.11b, which is precisely what allows the two to interoperate in one cell. It therefore inherits the band’s limitations as well - three non-overlapping channels and interference from every other device in the ISM band. Two of the options here are again rates rather than frequencies.

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 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.

31.

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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32.

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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33.

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

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

Answer: C

Correct answer: 2.4GHz

802.11g operates at 2.4 GHz, the same band as 802.11b, which is precisely what allows the two to interoperate in one cell. It therefore inherits the band’s limitations as well - three non-overlapping channels and interference from every other device in the ISM band. Two of the options here are again rates rather than frequencies.

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34.

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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35.

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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