wireless test 2

1

Which of the following are valid ISM bands? (Choose all that apply.)

1

Which of the following are valid UNII bands? (Choose all that apply.)

1

Which technologies are used in the 2.4 GHz ISM band? (Choose all that apply)

1

802.11n (HT clause 20 radios) can transmit in which frequency bands? (Choose all that apply)

1

In the UNII-1 band, what is the center frequency of channel 40?

1

What is the channel and band of a Wi-Fi transmission whose center frequency is 5.300 GHz?

1

The 802.11-2007 standard requires how much separation between center frequencies for HR-DSSS (clause 18) channels to be considered nonoverlapping?

1

What best describes hop time?

1

As defined by the IEEE-2007 standard, how much separation is needed between center frequencies of channels in the UNII-2 Extended band?

1

When deploying an 802.11g (ERP-OFDM) wireless network with only two access points, which of these channel groupings would be considered nonoverlapping? (Choose all that apply)

1

Which spread spectrum technology specifies data rates of 22 Mbps and 33 Mbps?

1

If data is corrupted by previous data from a reflected signal, this is known as what?

1

Assuming all channels are supported by a 5 GHz access point, how many possible channels can be configured on the access point?

1

Which of these technologies is the most resilient against the negative effects of multipath?

1

HR-DSSS (clause 18) calls for data rates of 5.5 Mbps, and 11 Mbps, What is the average amount of aggregate throughput percentage at any data rate?

1

As defined in the IEEE 802.11-2007 Standard, choose the answer that shows the number of channels in each of the UNII bands, listed in the following order: UNII-1, UNII-2, UNII-2e, UNII-3.

1

With the center frequency of channel 1 at 2.412 GHz, what is the center frequency of channel 2?

1

What are the modulation types used by OFDM technology ? (Choose all that apply)

1

The Barker code converts a bit of data into a series of bits that are referred to as what?

1

OFDM uses how many 312.5 KHz data subcarriers when transmitting?

1

An 802.11 wireless network name is known as which type of address? (Choose all that apply.)

1

Which two 802.11 topologies require the use of an access point?

1

The 802.11 standard defines which medium to be used in a distribution system (DS)?

1

4. Which option is a wireless computer topology used for communication of computer devices within close proximity of a person?

1

Which 802.11 service set may allow for client roaming?

1

What is the default configuration mode that allows an AP radio to operate in a basic service set?

1

Which terms describe an 802.11 topology involving STAs but no access points? (Choose all that apply.)

1

What factors might affect the size of a BSA coverage area of an access point? (Choose all that apply.)

1

STAs operating in infrastructure mode may communicate in which of the following scenarios? (Choose all that apply.)

1

What are the only three original topologies defined by the 802.11-2007 standard? (Choose all that apply.)

1

Which wireless topology provides citywide wireless coverage?

1

At which layer of the OSI model will a BSSID address be used?

1

The basic service set identifier address can be found in which topologies? (Choose all that apply.)

1

Which 802.11 service set defines mechanisms for mesh networking?

1

What method of dialog communications is used within an 802.11 WLAN?

1

What are some nonstandard modes in which an AP radio may be configured? (Choose all that apply.)

1

A network consisting of clients and one or more access points with the same SSID connected by an 802.3 Ethernet backbone is one example of which 802.11 topology? (Choose all that apply.)

1

What term best describes two access points communicating with each other wirelessly while also allowing clients to communicate through the access point?

1

What components make up a distribution system? (Choose all that apply.)

1

What type of wireless topology is defined by the 802.11 standard?

1

DCF is also known as what? (Choose all that apply)

1

802.11 collision detection is handled using which technology?

1

ACK and CTS-to-self frames follow which interframe space?

1

The carrier sense portion of CSMA/CA is performed by using which of the following methods? (Choose all that apply)

1

After the station has performed the carrier sense and determined that no other devices are transmitting for a period of a DIFS interval, what is the next step for the station?

1

If PCF is implemented, it can function in which of the following network environments? (Choose all that apply)

1

Which of the following terms are affiliated with the virtual carrier-sense mechanism? (Choose all that apply)

1

The goal of allocating equal time as opposed to equal opportunity is known as what?

1

CSMA/CA and DCF define which mechanisms to ensure that only one 802.11 radio can transmit on the half-duplex RF medium? (Choose all that apply)

1

The Wi-Fi Alliance certification called Wi-Fi Multimedia (WMM) is based on which media access method defined by the 802.11-2007 standard?

1

Hybrid Coordination Function (HCF) defines what allotted period of time in which a station can transmit multiple frames?

1

Currently, WMM is based on EDCA and provides for traffic prioritization via which of the following access categories? (Choose all that apply)

1

The 802.11e amendment (now part of the 802.11-2007 standard) defines which of the following medium access methods to support QoS requirements? (Choose all that apply)

1

What information that comes from the wired side network is used to assign traffic into access categories on a WLAN controller?

1

What are the two reasons that 802.11 radios use physical carrier sense? (Choose two)

1

What CSMA/CA mechanism is used for medium contention? (Choose all that apply)

1

Which field in the MAC header of an 802.11 frame reset the NAV timer for all listening 802.11 stations?

1

The EDCA medium access method provides for the prioritization of traffic via priority tags that are identical to the 802.1D priority tags. What are the EDCA priority tags known as?

1

ACKs are required for which of the following frames?

1

What QoS mechanism can be used to reduce medium contention overhead during a frame burst of low-latency traffic?

1

Which of the following contains only LLC data and the IP packet, but does not include any 802.11 data?

1

If WMM-PS is not supported, after a station sees its AID set to 1 in the TIM, what typically is the next frame that the station transmits?

1

Which of the following are true about beacon management frames? (Choose all that apply.)

1

Which of the following information is included in a probe response frame? (Choose all that apply.)

1

The presence of what type of transmissions can trigger the protection mechanism within an ERP basic service set? (Choose all that apply.)

1

Which of the following are protection mechanisms? (Choose all that apply.)

1

What is the difference between association frames and reassociation frames? (Choose all that apply.)

1

When a station sends an RTS, the Duration/ID field notifies the other stations that they must set their NAV timers to which of the following values?

1

How does a client station indicate that it is using Power Save mode?

1

What would cause an 802.11 station to retransmit a unicast frame? (Choose all that apply.)

1

If a station is in Power Save mode, how does it know that the AP has buffered unicast frames waiting for it?

1

When is an ERP (802.11g) AP required by the IEEE 802.11-2007 standard to respond to probe request frames from nearby HR-DSSS (802.11b) stations? (Choose all that apply.)

1

Which of the following are true about scanning? (Choose all that apply.)

1

What process is used by band steering to make client radios connect to the AP's 5 GHz radio?

1

When a client station is first powered on, what is the order of frames generated by the client station and AP?

1

WLAN users have recently complained about gaps in audio and problems with the push-to-talk capabilities with the ACME Company's VoWiFi phones. What could be the cause of this problem?

1

The WLAN help desk gets a call that all of the sudden, all of the HR-DSSS (802.11b) VoWiFi phones cannot connect to any of the ERP (802.11g) lightweight APs that are managed by a multiple-channel architecture WLAN controller. All the laptops with ERP (802.11g) radios can still connect. What are the possible causes of this problem? (Choose all that apply.)

1

In a multiple-channel architecture, roaming is controlled by the client station and occurs based on a set of proprietary rules determined by the manufacturer of the wireless radio. Which of the following parameters are often used when making the decision to roam? (Choose all that apply.)

1

What are some of the advantages of using U-APSD and WMM-PS power management over legacy power-management methods? (Choose all that apply.)

1

WMM-PS is based on which 802.11-2007 power-management method?

1

❌ - Data link Layer - has two sublayers
❌ - Logical link control - establish flow control
❌ - Media access control - mac address
❌ - MAC service data unit - data (layer 3-7) of MAC from LLC
❌ - MAC protocol data unit - encapsulation in MAC frame
❌ - PLCP services data unit - same frame as MPDU
❌ - PLCP protocol data unit - adds preamble and PHY header
❌ - request to send
❌ - clear to send
❌ - acknowledgement
❌ - traffic indication map
❌ - delivery traffic indication message
❌ - announcement traffic indication message

DLL

LLC

MAC

MSDU

MPDU

PSDU

PPDU

RTS

CTS

ACK

TIM

DTIM

ATIM

1

❌ - carrier sense multiple access w/ collision avoidance
❌ - carrier sense multiple access w/ collision detection
❌ - distributed coordination function - mandatory access mode of 802.11
❌ - point coordination function - optional access mode of 802.11
HCF - hybrid coordination function - combines DCF + PCF
HCF - hybrid coordination function
❌ - block acknowledgement
❌ - Wi-Fi multimedia
❌ - interframe space - time between wireless transmissions

CSMA/CA

CSMA/CD

DCF

PCF

BA

WMM

IFS

1

❌ - access points - wired hubs
IS - integration service - delivery of MSDUS between DS via portal (AP)
❌ - distribution service - connects basic set of services via LAN
❌ - wireless distribution service - DS using wireless medium (bridge)
❌ - service set identifier - identifies network
❌ - basic service set
IBSS - independent basic service set
MBSS - mesh basic service set
❌ - basic service set identifier
❌ - MAC service data unit - upper-layer info contained in 802.11 frame
❌ - distribution system services - switch in AP or WLAN controller
BSA - basic service area
ESS - extended service set

AP

DS

WDS

SSID

BSS

BSSID

MSDU

DSS

1

❌ - frequency hopping spread spectrum - transmits narrowband signal over a wide band
❌ - direct sequence spread spectrum - transmits signal accross frequency wide range
❌ - industrial, scientific and medical band
❌ - unlicensed national information infrastructure band
❌ - orthogonal frequency division multiplexing - divides whole bandwidth into subcarriers

FHSS

DSSS

ISM

UNII

OFDM

Computer Science Test sobre wireless test 2, creado por Duncan Levings el 31/10/2018.

wireless test 2

wireless test 2

Which of the following are valid ISM bands? (Choose all that apply.)

Which of the following are valid UNII bands? (Choose all that apply.)

Which technologies are used in the 2.4 GHz ISM band? (Choose all that apply)

802.11n (HT clause 20 radios) can transmit in which frequency bands? (Choose all that apply)

In the UNII-1 band, what is the center frequency of channel 40?

What is the channel and band of a Wi-Fi transmission whose center frequency is 5.300 GHz?

The 802.11-2007 standard requires how much separation between center frequencies for HR-DSSS (clause 18) channels to be considered nonoverlapping?

What best describes hop time?

As defined by the IEEE-2007 standard, how much separation is needed between center frequencies of channels in the UNII-2 Extended band?

When deploying an 802.11g (ERP-OFDM) wireless network with only two access points, which of these channel groupings would be considered nonoverlapping? (Choose all that apply)

Which spread spectrum technology specifies data rates of 22 Mbps and 33 Mbps?

If data is corrupted by previous data from a reflected signal, this is known as what?

Assuming all channels are supported by a 5 GHz access point, how many possible channels can be configured on the access point?

Which of these technologies is the most resilient against the negative effects of multipath?

HR-DSSS (clause 18) calls for data rates of 5.5 Mbps, and 11 Mbps, What is the average amount of aggregate throughput percentage at any data rate?

As defined in the IEEE 802.11-2007 Standard, choose the answer that shows the number of channels in each of the UNII bands, listed in the following order: UNII-1, UNII-2, UNII-2e, UNII-3.

With the center frequency of channel 1 at 2.412 GHz, what is the center frequency of channel 2?

What are the modulation types used by OFDM technology ? (Choose all that apply)

The Barker code converts a bit of data into a series of bits that are referred to as what?