Term
802.11 technology is typically deployed at which fundamental layer of network
architecture? |
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Definition
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C. 802.11 wireless networking is typically used to connect client stations to the network
via an access point. Autonomous and lightweight access points are deployed at
the access layer, not the core or distribution layer. The Physical layer is a layer of the
OSI model, not a network architecture layer. |
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Term
Which organization is responsible for enforcing maximum transmit power rules in an
unlicensed frequency band? |
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Definition
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. E. RF communications are regulated differently in many regions and countries. The
local regulatory domain authorities of individual countries or regions define the spectrum
policies and transmit power rules. |
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Term
| 802.11 wireless bridge links are typically associated with which network architecture layer? |
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Definition
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B. 802.11 wireless bridge links are typically used to perform distribution layer services.
Core layer devices are usually much faster than 802.11 wireless devices, and bridges
are not used to provide access layer services. The Network layer is a layer of the OSI
model, not a network architecture layer. |
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Term
| The 802.11-2012 standard was created by which organization? |
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Definition
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A. The Institute of Electrical and Electronics Engineers (IEEE) is responsible for the
creation of all of the 802 standards. |
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Term
| What organization ensures interoperability of WLAN products? |
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Definition
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. D. The Wi-Fi Alliance provides certification testing, and when a product passes the
test, it receives a Wi-Fi Interoperability Certificate. |
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Term
| What type of signal is required to carry data? |
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Definition
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C. A carrier signal is a modulated signal that is used to transmit binary data. |
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Term
| Which keying method is most susceptible to interference from noise? |
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Definition
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B. Because of the effects of noise on the amplitude of a signal, amplitude-shift keying
(ASK) has to be used cautiously. |
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Term
Which sublayer of the OSI model’s Data-Link layer is used for communication between
802.11 radios? |
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Definition
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C. The IEEE 802.11-2012 standard defines communication mechanisms at only the
Physical layer and MAC sublayer of the Data-Link layer of the OSI model. The Logical
Link Control (LLC) sublayer of the Data-Link layer is not defined by the 802.11-2012
standard. WPA is a security certification. FSK is a modulation method. |
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Term
While performing some research, Janie comes across a reference to a document titled RFC
3935. Which of the following organization’s website would be best to further research this
document? |
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Definition
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E. The IETF is responsible for creation of RFC documents. The IEEE is responsible for
the 802 standards. The Wi-Fi Alliance is responsible for certification tests. The Wi-Fi
Alliance used to be known as WECA but changed its name to Wi-Fi Alliance in 2002.
The FCC is responsible for RF regulatory rules in the United States. |
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Term
| The Wi-Fi Alliance is responsible for which of the following certification programs? |
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Definition
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D. Wi-Fi Multimedia (WMM) is a Wi-Fi Alliance certification program that enables
Wi-Fi networks to prioritize traffic generated by different applications. 802.11-2012 is the IEEE standard, and WEP (Wired Equivalent Privacy) is defined as part of the IEEE
802.11-2012 standard. 802.11i was the IEEE amendment that defined robust security
network (RSN) and is also part of the 802.11-2012 standard. PSK is not a standard; it
is an encoding technique. |
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Term
| Which wave properties can be modulated to encode data? (Choose all that apply.) |
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Definition
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A, B and C. The three keying methods that can be used to encode data are amplitude-shift
keying (ASK), frequency-shift keying (FSK), and phase-shift keying (PSK). |
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Term
The IEEE 802.11-2012 standard defines communication mechanisms at which layers of the
OSI model? (Choose all that apply.) |
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Definition
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B and E. The IEEE 802.11-2012 standard defines communication mechanisms at only
the Physical layer and MAC sublayer of the Data-Link layer of the OSI model. |
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Term
| The height or power of a wave is known as what? |
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Definition
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C. Height and power are two terms that describe the amplitude of a wave. Frequency is
how often a wave repeats itself. Wavelength is the actual length of the wave, typically
measured from peak to peak. Phase refers to the starting point of a wave in relation to
another wave. |
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Term
Samantha received a gaming system as a gift. She would like to have it communicate with
her sister Jennifer’s gaming system so that they can play against each other. Which of the
following technologies, if deployed in the two gaming systems, should provide for the easiest
configuration of the two systems to communicate with each other? |
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Definition
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B. Wi-Fi Direct is designed to provide easy setup for communications directly between
wireless devices. Wi-Fi Personal does not exist. 802.11n will likely provide connectivity,
but setup could be easy or difficult depending on the environment. CWG-RF is designed
for Wi-Fi and cellular radios in a converged handset. Wi-Fi Protected Setup is designed to
simplify security setup. |
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Term
What other Wi-Fi Alliance certifications are required before a Wi-Fi radio can also be certified
as Voice Enterprise compliant? (Choose all that apply.) |
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Definition
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. A, C and E. Voice Enterprise offers enhanced support for voice applications in enterprise
Wi-Fi networks. Voice Enterprise equipment must also support seamless roaming between
APs, WPA2-Enterprise security, optimization of power through the WMM-Power Save
mechanism, and traffic management through WMM-Admission Control. |
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Term
Which of the following wireless communications parameters and usage are typically governed
by a local regulatory authority? (Choose all that apply.) |
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Definition
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. A, B, C, D and E. All of these are typically regulated by the local or regional RF
regulatory authority. |
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Term
The Wi-Fi Alliance is responsible for which of the following certification programs?
(Choose all that apply.) |
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Definition
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B and E. The Wi-Fi Alliance maintains certification programs to ensure vendor
interoperability. Voice Personal is a certification program that defines enhanced support
for voice applications in residential and small-business Wi-Fi networks. WMM-PS
is a certification program that defines methods to conserve battery power for devices
using Wi-Fi radios by managing the time the client device spends in sleep mode. |
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Term
| A wave is divided into degrees. How many degrees make up a complete wave? |
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Definition
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. D. A wave is divided into 360 degrees. |
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Term
What are the advantages of using unlicensed frequency bands for RF transmissions?
(Choose all that apply.) |
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Definition
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B and C. The main advantages of an unlicensed frequency are that permission to
transmit on the frequency is free and that anyone can use the unlicensed frequency.
Although there are no additional financial costs, you still must abide by transmission
regulations and other restrictions. The fact that anyone can use the frequency band is
also a disadvantage because of overcrowding. |
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Term
| The OSI model consists of how many layers? |
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Definition
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