NCTI FIELD TECH 2 TO 3 PROGRESSION FINAL
EXAM QUESTIONS AND CORRECT DETAILED
ANSWERS (VERIFIED ANSWERS) |ALREADY GRADED
A+
What uses the 2.4-GHz band and runs at 54 Mbps? - ans -802.11g
What is one reason why broadband cable operators install fiber-optic cable in
stages instead of changing the infrastructure all at once? - ans -Changing the
infrastructure all at once would cause too many service disruptions.
Bluetooth uses which spread spectrum technology? - ans -Frequency-hopping
spread spectrum (FHSS).
Bluetooth is a short range wireless personal area network (WPAN) technology
that is covered under which Institute of Electrical and Electronics Engineers (IEEE)
standard? - ans -IEEE 802.15
What technologies does the IEEE 802.11n wireless standard use to achieve data
rates as high as 600 megabits per second (Mbps)? - ans -Multiple input, multiple
output (MIMO) technology and spatial multiplexing.
What does the Institute of Electrical and Electronics Engineers (IEEE) specify as
the maximum allowable power output into the intentional radiator for IEEE
802.11a-, 802.11n-, and 802.11ac-compliant devices operating on the lower
Unlicensed National Information Infrastructure (U-NII) radio band? - ans -40
milliwatts (mW).
How wide is each of the three wireless local area network (WLAN) Unlicensed
National Information Infrastructure (U-NII) bands? - ans -100 megahertz (MHz).
When connecting to a wireless local area network (WLAN), what is the most
important point about the service set identifier (SSID)? - ans -That the clients and
all access points (AP) must be configured with matching SSIDs.
,How does a client locate a wireless local area network (WLAN) when performing
passive scanning? - ans -The client listens for beacons until it hears a beacon
listing the service set identifier (SSID) of the network it expects to join.
Why would a wireless local area network (WLAN) administrator rarely see the
"authenticated" step on the access point (AP)? - ans -Because clients pass the
authentication stage and immediately proceed into the association stage.
Why is shared key authentication considered a security risk in a wireless local area
network (WLAN)? - ans -The access point (AP) transmits the challenge text in the
clear and receives the same challenge text encrypted with the wired equivalent
privacy (WEP) key.
An independent basic service set (IBSS) is also commonly referred to as which one
of the following? - ans -Ad hoc network.
What is a wireless local area network (WLAN) service set? - ans -It describes the
basic components of a fully operational WLAN.
Which term describes the operation mode of a basic service set (BSS)? - ans -
Infrastructure mode.
In a segmented wireless local area network (WLAN) that has a different Internet
protocol (IP) address for each segment, which solution allows mobile clients to
maintain their connectivity when roaming into different segments? - ans -To
deploy all access points (AP) on a single virtual local area network (VLAN) using a
flat IP subnet for all APs so that no change of IP address for roaming clients occurs
and all traffic goes through a central controller.
Which one of the following power management modes populates a traffic
indication map (TIM) in a basic service set (BSS) or extended service set (ESS)? -
ans -Power save polling (PSP) mode.
As a subscriber enters a hotspot area, what signals their mobile wireless device of
an available Wi-Fi network? - ans -The access point (AP) advertises to the wireless
device to enable connection.
, Which is the largest IEEE 802.11 data frame that can traverse a wireless local area
network (WLAN) without fragmentation? - ans -2,346 bytes.
What is the tradeoff between the fragmenting of packets into shorter fragments
versus keeping longer packet fragments? - ans -Shorter packet fragments have
lower probability of errors from interference than longer packet fragments, but
shorter packet fragments require more error correction.
Which type of interframe space provides the highest level of priority network
function control over the medium for a short time period? - ans -Short interframe
space (SIFS).
How are interframe spaces used in an IEEE 802.11 wireless local area network
(WLAN)? - ans -They are used to defer a station's access to the medium and
provide various levels of priority.
What is a slot time in an IEEE 802.11 wireless local area network (WLAN)? - ans -A
standard period of time on a WLAN that each station multiplies by a random
number to determine the length of time to wait before performing a clear
channel assessment (CCA).
What is the purpose of the IEEE 802.11 wireless local area network (WLAN)
superframe? - ans -To allow fair coexistence between point coordination function
(PCF)-mode and distributed coordination function (DCF)-mode clients on the
network.
When should you consider enabling Request to Send/Clear to Send (RTS/CTS)
protocol on a wireless local area network (WLAN)? - ans -When large frames
experience high collision rates.
What does the "on with threshold" setting of the Request to Send/Clear to Send
(RTS/CTS) protocol allow the wireless local area network (WLAN) administrator to
control? - ans -To control which frames over a certain size are announced and
cleared to send by the stations.
EXAM QUESTIONS AND CORRECT DETAILED
ANSWERS (VERIFIED ANSWERS) |ALREADY GRADED
A+
What uses the 2.4-GHz band and runs at 54 Mbps? - ans -802.11g
What is one reason why broadband cable operators install fiber-optic cable in
stages instead of changing the infrastructure all at once? - ans -Changing the
infrastructure all at once would cause too many service disruptions.
Bluetooth uses which spread spectrum technology? - ans -Frequency-hopping
spread spectrum (FHSS).
Bluetooth is a short range wireless personal area network (WPAN) technology
that is covered under which Institute of Electrical and Electronics Engineers (IEEE)
standard? - ans -IEEE 802.15
What technologies does the IEEE 802.11n wireless standard use to achieve data
rates as high as 600 megabits per second (Mbps)? - ans -Multiple input, multiple
output (MIMO) technology and spatial multiplexing.
What does the Institute of Electrical and Electronics Engineers (IEEE) specify as
the maximum allowable power output into the intentional radiator for IEEE
802.11a-, 802.11n-, and 802.11ac-compliant devices operating on the lower
Unlicensed National Information Infrastructure (U-NII) radio band? - ans -40
milliwatts (mW).
How wide is each of the three wireless local area network (WLAN) Unlicensed
National Information Infrastructure (U-NII) bands? - ans -100 megahertz (MHz).
When connecting to a wireless local area network (WLAN), what is the most
important point about the service set identifier (SSID)? - ans -That the clients and
all access points (AP) must be configured with matching SSIDs.
,How does a client locate a wireless local area network (WLAN) when performing
passive scanning? - ans -The client listens for beacons until it hears a beacon
listing the service set identifier (SSID) of the network it expects to join.
Why would a wireless local area network (WLAN) administrator rarely see the
"authenticated" step on the access point (AP)? - ans -Because clients pass the
authentication stage and immediately proceed into the association stage.
Why is shared key authentication considered a security risk in a wireless local area
network (WLAN)? - ans -The access point (AP) transmits the challenge text in the
clear and receives the same challenge text encrypted with the wired equivalent
privacy (WEP) key.
An independent basic service set (IBSS) is also commonly referred to as which one
of the following? - ans -Ad hoc network.
What is a wireless local area network (WLAN) service set? - ans -It describes the
basic components of a fully operational WLAN.
Which term describes the operation mode of a basic service set (BSS)? - ans -
Infrastructure mode.
In a segmented wireless local area network (WLAN) that has a different Internet
protocol (IP) address for each segment, which solution allows mobile clients to
maintain their connectivity when roaming into different segments? - ans -To
deploy all access points (AP) on a single virtual local area network (VLAN) using a
flat IP subnet for all APs so that no change of IP address for roaming clients occurs
and all traffic goes through a central controller.
Which one of the following power management modes populates a traffic
indication map (TIM) in a basic service set (BSS) or extended service set (ESS)? -
ans -Power save polling (PSP) mode.
As a subscriber enters a hotspot area, what signals their mobile wireless device of
an available Wi-Fi network? - ans -The access point (AP) advertises to the wireless
device to enable connection.
, Which is the largest IEEE 802.11 data frame that can traverse a wireless local area
network (WLAN) without fragmentation? - ans -2,346 bytes.
What is the tradeoff between the fragmenting of packets into shorter fragments
versus keeping longer packet fragments? - ans -Shorter packet fragments have
lower probability of errors from interference than longer packet fragments, but
shorter packet fragments require more error correction.
Which type of interframe space provides the highest level of priority network
function control over the medium for a short time period? - ans -Short interframe
space (SIFS).
How are interframe spaces used in an IEEE 802.11 wireless local area network
(WLAN)? - ans -They are used to defer a station's access to the medium and
provide various levels of priority.
What is a slot time in an IEEE 802.11 wireless local area network (WLAN)? - ans -A
standard period of time on a WLAN that each station multiplies by a random
number to determine the length of time to wait before performing a clear
channel assessment (CCA).
What is the purpose of the IEEE 802.11 wireless local area network (WLAN)
superframe? - ans -To allow fair coexistence between point coordination function
(PCF)-mode and distributed coordination function (DCF)-mode clients on the
network.
When should you consider enabling Request to Send/Clear to Send (RTS/CTS)
protocol on a wireless local area network (WLAN)? - ans -When large frames
experience high collision rates.
What does the "on with threshold" setting of the Request to Send/Clear to Send
(RTS/CTS) protocol allow the wireless local area network (WLAN) administrator to
control? - ans -To control which frames over a certain size are announced and
cleared to send by the stations.
