Deck 9: Wireless Metropolitan Area Networks

Question 1

With WiMAX, the frame headers are not encrypted but the data can be sent encrypted.

Answer 1

True

Question 2

Which type of point-to-point connection is infrared-based?

A) WiMAX
B) LMDS
C) MMDS
D) FSO

Answer 2

D

Question 3

When transmitting on a single frequency, all transmitters must work in which of the following modes?

A) full-duplex
B) half-duplex
C) simplex
D) half-simplex

Answer 3

B

Question 4

In what type of link are multiple signals sent simultaneously over the medium at different frequencies?

A) baseband
B) broadband
C) ultraband
D) multiband

Question 5

Which of the following is an example of baseband transmission?

A) Ethernet
B) DSL
C) ISDN
D) cable modem

Question 6

What is a primary factor in determining the cell size in an LMDS network?

A) temperature
B) rainfall
C) frequency
D) amplitude

Question 7

Which wireless MAN technology can transmit up to 2 Mbps downstream at distances up to five miles?

A) FSO
B) LMDS
C) MMDS
D) WiMAX

Question 8

LMDS signals can travel up to 30 miles using optical line-of-sight technology.

Question 9

Which of the following is NOT and advantage of FSO?

A) cost
B) speed of installation
C) reliability
D) security

Question 10

What term is used when WiMAX uses one frequency for downlink and another for uplink?

A) frequency division multiplexing
B) time division multiplexing
C) multi-frequency transmission
D) dual-frequency transmission

Question 11

Which of the following is an advantage of MMDS?

A) signal strength
B) frequency sharing
C) security
D) availability

Question 12

Which of the following is true about the MAC layer for WiMAX?

A) it depends on the upper layers for privacy
B) it supports multiple frequency bands
C) only a single service can use a link at a given time
D) it is connection-oriented

Question 13

What would be an example of a backhaul connection?

A) connection between an ISP and a business
B) connection between a business and another business
C) connection between two offices of a phone company
D) connection between two residential users

Question 14

Which wireless MAN technology communicates with data rates up to 70 Mbps in the 2-11 GHz bands?

A) LMDS
B) FSO
C) WiMAX
D) MMDS

Question 15

WiMAX uses two frequency channels, one for uplink and the other for downlink.

Question 16

Which of the following is a transmission mode supported by WiMAX line-of-sight fixed point-to-point connections?

A) WirelessMAN-OFDM
B) WirelessMAN-SC
C) WirelessMAN-OFDMA
D) WirelessHUMAN

Question 17

Which wireless MAN technology has the ability to compete with cable TV networks in local areas, and can transmit at up to 155 Mbps?

A) FSO
B) LMDS
C) MMDS
D) WiMAX

Question 18

A last mile connection is the link between two ISPs.

Question 19

Baseband transmissions consist of multiple data channels.

Question 20

What is the connection referred to that connects the user to the ISP?

A) customer premises connection
B) last mile connection
C) user uplink connection
D) backbone connection

Question 21

What are header-only MAC frames used for in a WiMAX network?

A) send commands and requests between the BS and SSs
B) transmit setup information to the base station
C) establish security protocols
D) send error codes to end user devices

Question 22

Most WMAN technologies are based on ___________ signals.

Question 23

MATCHING
a. baseband
b. broadband
c. burst profiles
d. Free Space Optics
e. jitter
f. latency
g. Network Interface Unit
h. scintillation
i. super high frequency
j. Time Division Duplexing
the temporal and spatial variations in light intensity caused by atmospheric turbulence

Question 24

MATCHING
a. baseband
b. broadband
c. burst profiles
d. Free Space Optics
e. jitter
f. latency
g. Network Interface Unit
h. scintillation
i. super high frequency
j. Time Division Duplexing
a transmission technique that treats the entire transmission medium as only one channel

Question 25

What is the 16-bit connection identifier used for in WiMAX transmissions?

A) to determine which station should act as the BS
B) for forward error correction
C) for the BS to address a burst to an SS
D) identifies the maximum number of SSs on the link

Question 26

MATCHING
a. baseband
b. broadband
c. burst profiles
d. Free Space Optics
e. jitter
f. latency
g. Network Interface Unit
h. scintillation
i. super high frequency
j. Time Division Duplexing
the part of the frequency spectrum from 3 to 30 GHz

Question 27

MATCHING
a. baseband
b. broadband
c. burst profiles
d. Free Space Optics
e. jitter
f. latency
g. Network Interface Unit
h. scintillation
i. super high frequency
j. Time Division Duplexing
the amount of time delay that it takes a packet to travel from source to destination device

Question 28

MATCHING
a. baseband
b. broadband
c. burst profiles
d. Free Space Optics
e. jitter
f. latency
g. Network Interface Unit
h. scintillation
i. super high frequency
j. Time Division Duplexing
a transmission technique that sends multiple signals at different frequencies

Question 29

In a WiMAX network, a ______________ station is usually either a laptop computer or a device that attaches to a LAN.

Question 30

MATCHING
a. baseband
b. broadband
c. burst profiles
d. Free Space Optics
e. jitter
f. latency
g. Network Interface Unit
h. scintillation
i. super high frequency
j. Time Division Duplexing
a device that connects an LMDS modem to a LAN or telephone system

Question 31

What transmission technique helps WiMAX use the channel bandwidth more efficiently?

A) latency
B) automatic repeat requests
C) FEC
D) adaptive modulation

Question 32

MATCHING
a. baseband
b. broadband
c. burst profiles
d. Free Space Optics
e. jitter
f. latency
g. Network Interface Unit
h. scintillation
i. super high frequency
j. Time Division Duplexing
negotiated between the BS and the SSs that specifies the number of time slots allocated to the SSs to maintain QoS

Question 33

________________ treats the entire transmission medium as if it were only one channel and transmits only one data signal at a time over a single frequency.

Question 34

MATCHING
a. baseband
b. broadband
c. burst profiles
d. Free Space Optics
e. jitter
f. latency
g. Network Interface Unit
h. scintillation
i. super high frequency
j. Time Division Duplexing
the maximum delay variation between two consecutive packets over a period of time

Question 35

The 8021.16e standard defines specifications for a ____________ version of WiMAX.

Question 36

What do manufacturers install in every WiMAX device for authentication purposes?

A) encryption code
B) digital certificate
C) hashing algorithm
D) authentication protocol

Question 37

MATCHING
a. baseband
b. broadband
c. burst profiles
d. Free Space Optics
e. jitter
f. latency
g. Network Interface Unit
h. scintillation
i. super high frequency
j. Time Division Duplexing
a mechanism that divides a single transmission into two parts: an uplink part and a downlink part

Question 38

A WiMAX _____________ is a set of predefined parameters that can include frequency channel, bandwidth, and transmission mode.

Question 39

In which frequency band does WirelessHUMAN operate?

A) 1-10 GHz licensed
B) 10-66 GHz licensed
C) 5 GHz U-NII
D) 11 GHZ U-NII

Question 40

MATCHING
a. baseband
b. broadband
c. burst profiles
d. Free Space Optics
e. jitter
f. latency
g. Network Interface Unit
h. scintillation
i. super high frequency
j. Time Division Duplexing
an optical, wireless, point-to-point, line-of-sight broadband technology

Question 41

How do atmospheric conditions have an impact on FSO transmissions?

Question 42

What are the three basic profiles supported by WiMAX?

Question 43

How is the MAC layer of WiMAX different from technologies like Ethernet?

Question 44

Describe the basic characteristics of Free Space Optics.

Question 45

What are the two primary goals of WMANs?

Question 46

Describe the hub used in an MMDS network.

Question 47

What is a burst data transmission in the 802.16 standard?

Question 48

How does the WiMAX privacy sublayer provide security for a WiMAX network?

Question 49

What does the M in LMDS mean?

Question 50

Describe the disadvantages of MMDS.