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| 1 | |
Which of the following statements about wired and wireless LANs is correct? |
| | A) | Both operate in the lower two layers of the TCP/IP protocol suite. |
| | B) | Wired LANs operate in the lower two layers and wireless LANs operate in the lower three layers of the TCP/IP protocol suite. |
| | C) | Wired LANs operate in the lower three layers and wireless LANs operate in the lower two layers of the TCP/IP protocol suite. |
| | D) | Both operate in the lower three layers of the TCP/IP protocol suite. |
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| 2 | |
IEEE has defined the specifications for a wireless LAN, called _______, which covers the physical and data link layers. |
| | A) | IEEE 802.3 |
| | B) | IEEE 802.5 |
| | C) | IEEE 802.11 |
| | D) | IEEE 802.2 |
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| 3 | |
The CSMA/CD algorithm does not work in wireless LAN because |
| | A) | wireless host does not have enough power to work in s duplex mode. |
| | B) | of the hidden station problem. |
| | C) | signal fading could prevent a station at one end from hearing a collision at the other end. |
| | D) | All of the choices are correct. |
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| 4 | |
In IEEE 802.11, a ___ is made of stationary or mobile wireless stations and an optional central base station, known as the access point (AP). |
| | A) | ESS |
| | B) | BSS |
| | C) | CSS |
| | D) | None of the choices are correct. |
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| 5 | |
In IEEE 802.11, a BSS without an AP is called _________. |
| | A) | an ad hoc architecture |
| | B) | an infrastructure network |
| | C) | either an ad hoc architecture or an infrastructure network |
| | D) | None of the choices are correct. |
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| 6 | |
In IEEE 802.11, a BSS with an AP is sometimes referred to as ____________. |
| | A) | an ad hoc architecture |
| | B) | an infrastructure network |
| | C) | either an ad hoc architecture or an infrastructure network |
| | D) | None of the choices are correct. |
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| 7 | |
In IEEE 802.11, communication between two stations in two different BSSs usually occurs via two ________. |
| | A) | BSSs |
| | B) | ESSs |
| | C) | APs |
| | D) | None of the choices are correct. |
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| 8 | |
In IEEE 802.11, a station with ________ mobility is either stationary (not moving) or moving only inside a BSS. |
| | A) | no-transition |
| | B) | BSS-transition |
| | C) | ESS-transition |
| | D) | None of the choices are correct. |
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| 9 | |
In IEEE 802.11, a station with ________ mobility can move from one BSS to another, but the movement is confined inside one ESS. |
| | A) | no-transition |
| | B) | BSS-transition |
| | C) | ESS-transition |
| | D) | None of the choices are correct. |
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| 10 | |
In IEEE 802.11, a station with ________ mobility can move from one ESS to another. |
| | A) | no-transition |
| | B) | BSS-transition |
| | C) | ESS-transition |
| | D) | None of the choices are correct. |
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| 11 | |
In IEEE 802.11, distributed coordination function (DCF) uses _______ as the access method. |
| | A) | CSMA/CA |
| | B) | CSMA/CD |
| | C) | ALOHA |
| | D) | None of the choices are correct. |
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| 12 | |
In IEEE 802.11, when a frame is going from one station in a BSS to another station in the same BSS, the address flag is _____ |
| | A) | 00 |
| | B) | 01 |
| | C) | 10 |
| | D) | 11 |
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| 13 | |
In IEEE 802.11, when a frame is coming from an AP and going to a station, the address flag is _______. |
| | A) | 00 |
| | B) | 01 |
| | C) | 10 |
| | D) | 11 |
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| 14 | |
In IEEE 802.11, when a frame is going from a station to an AP, the address flag is _____. |
| | A) | 00 |
| | B) | 01 |
| | C) | 10 |
| | D) | 11 |
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| 15 | |
In IEEE 802.11, when a frame is going from one AP to another AP in a wireless distribution system, the address flag is _____ |
| | A) | 00 |
| | B) | 01 |
| | C) | 10 |
| | D) | 11 |
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| 16 | |
In IEEE 802.11, the access method used in the PCF sublayer is ______. |
| | A) | contention |
| | B) | controlled |
| | C) | polling |
| | D) | None of the choices are correct. |
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| 17 | |
In IEEE 802.11, the ______ is a time period used for collision avoidance. |
| | A) | NAV |
| | B) | BSS |
| | C) | ESS |
| | D) | None of the choices are correct. |
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| 18 | |
In IEEE 802.11, the addressing mechanism can include up to ______ addresses. |
| | A) | four |
| | B) | five |
| | C) | six |
| | D) | None of the choices are Correct. |
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| 19 | |
The original IEEE 802.11, uses _________. |
| | A) | FHSS |
| | B) | DSSS |
| | C) | OFDM |
| | D) | either FHSS or DSSS |
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| 20 | |
The IEEE 802.11a, uses _________. |
| | A) | FHSS |
| | B) | DSSS |
| | C) | OFDM |
| | D) | either FHSS or DSSS |
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| 21 | |
The IEEE 802.11b, uses _________. |
| | A) | FHSS |
| | B) | DSSS |
| | C) | OFDM |
| | D) | either FHSS or DSSS |
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| 22 | |
The IEEE 802.11g, uses _________. |
| | A) | FHSS |
| | B) | DSSS |
| | C) | OFDM |
| | D) | either FHSS or DSSS |
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| 23 | |
The IEEE 802.11 FHSS uses ______ modulation. |
| | A) | ASK |
| | B) | FSK |
| | C) | PSK |
| | D) | None of the choices are Correct. |
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| 24 | |
The IEEE 802.11 or IEEE 802.11b DSSS uses ______ modulation. |
| | A) | ASK |
| | B) | FSK |
| | C) | PSK |
| | D) | None of the choices are Correct. |
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| 25 | |
The IEEE 802.11a, IEEE 802.11g, or IEEE 802.11n OFDM uses ______ modulation. |
| | A) | ASK |
| | B) | FSK |
| | C) | PSK |
| | D) | None of the choices are Correct. |
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| 26 | |
Bluetooth is a _______ technology that connects devices (called gadgets) in a small area. |
| | A) | wired LAN |
| | B) | wireless LAN |
| | C) | VLAN |
| | D) | None of the choices are correct. |
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| 27 | |
In Bluetooth, multiple ________ form a network called a _________. |
| | A) | scatternet; piconets |
| | B) | piconets: scatternet |
| | C) | piconets: bluenet |
| | D) | bluenet; scatternet |
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| 28 | |
A Bluetooth network consists of _____ primary device(s) and up to ____ secondary devices. |
| | A) | one; five |
| | B) | five; three |
| | C) | two; six |
| | D) | one; seven |
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| 29 | |
In Bluetooth, the current data rate is ____ Mbps |
| | A) | 2 |
| | B) | 5 |
| | C) | 11 |
| | D) | None of the choices are correct. |
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| 30 | |
The access method in Bluetooth is ________. |
| | A) | FDMA |
| | B) | TDD-TDMA |
| | C) | CDMA |
| | D) | None of the choices are correct. |
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| 31 | |
In Bluetooth, the _____ link is used when data integrity is more important than avoiding latency. |
| | A) | SCO |
| | B) | ACL |
| | C) | ACO |
| | D) | SCL |
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| 32 | |
Bluetooth uses ______ in the physical layer to avoid interference from other devices or other networks. |
| | A) | DSSS |
| | B) | FHSS |
| | C) | FDMA |
| | D) | None of the choices are correct. |
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| 33 | |
Channelization (or channel partition as sometime called) is a multiple-access method in which the available bandwidth of a link is shared _________ between different stations. |
| | A) | in time |
| | B) | in frequency |
| | C) | through code |
| | D) | All of the choices are correct. |
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| 34 | |
In ______ the available bandwidth is divided into frequency bands. Each station is allocated a band to send its data. In other words, each band is reserved for a specific station, and it belongs to the station all the time. |
| | A) | FDMA |
| | B) | TDMA |
| | C) | CDMA |
| | D) | None of the choices are correct. |
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| 35 | |
In ______ the stations share the bandwidth of the channel in time. Each station is allocated a time slot during which it can send data. Each station transmits its data in is assigned time slot.. |
| | A) | FDMA |
| | B) | TDMA |
| | C) | CDMA |
| | D) | None of the choices are correct. |
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| 36 | |
In ______ each station is assigned a code; using a special coding scheme stations send data over the entire bandwidth of the channel without having to share the capacity of the channel in frequency or in time with other stations. |
| | A) | FDMA |
| | B) | TDMA |
| | C) | CDMA |
| | D) | None of the choices are correct. |
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| 37 | |
_______ is a first-generation cellular phone system. |
| | A) | AMPS |
| | B) | D-AMPS |
| | C) | GSM |
| | D) | None of the choices are correct. |
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| 38 | |
__________ is a second-generation cellular phone system. |
| | A) | AMPS |
| | B) | D-AMPS |
| | C) | GSM |
| | D) | None of the choices are correct. |
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| 39 | |
____________ is a digital version of AMPS. |
| | A) | GSM |
| | B) | D-AMPS |
| | C) | IS-95 |
| | D) | None of the choices are correct. |
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| 40 | |
___________ is a second-generation cellular phone system used in Europe. |
| | A) | GSM |
| | B) | D-AMPS |
| | C) | IS-95 |
| | D) | None of the choices are correct. |
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| 41 | |
________ is a second-generation cellular phone system based on CDMA and DSSS. |
| | A) | GSM |
| | B) | D-AMPS |
| | C) | IS-95 |
| | D) | None of the choices are correct. |
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| 42 | |
The __________ cellular phone system provided universal personal communication. |
| | A) | first-generation |
| | B) | second-generation |
| | C) | third-generation |
| | D) | None of the choices are correct. |
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| 43 | |
In a ______ handoff, a mobile station only communicates with one base station. |
| | A) | hard |
| | B) | soft |
| | C) | medium |
| | D) | none of the choices are correct |
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| 44 | |
In a ______ handoff, a mobile station can communicate with two base stations at the same time. |
| | A) | hard |
| | B) | soft |
| | C) | medium |
| | D) | none of the choices are correct |
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| 45 | |
In AMPS, each band is divided into ______ channels. |
| | A) | 800 |
| | B) | 900 |
| | C) | 1000 |
| | D) | None of the choices are correct. |
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| 46 | |
AMPS has a frequency reuse factor of _______. |
| | A) | 1 |
| | B) | 3 |
| | C) | 5 |
| | D) | 7 |
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| 47 | |
AMPS uses ______ to divide each 25-MHz band into channels. |
| | A) | FDMA |
| | B) | TDMA |
| | C) | CDMA |
| | D) | None of the choices are correct. |
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| 48 | |
GSM allows a reuse factor of _______. |
| | A) | 1 |
| | B) | 3 |
| | C) | 5 |
| | D) | 7 |
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| 49 | |
IS-95 uses the ISM _______ band. |
| | A) | 800-MHz |
| | B) | 900-MHz |
| | C) | 1900-MHz |
| | D) | either 800-MHZ or 1900-MHZ |
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| 50 | |
IS-95 uses the _______ satellite system for synchronization. |
| | A) | GPS |
| | B) | Teledesic |
| | C) | Iridium |
| | D) | none of the choices are correct |
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| 51 | |
In an IS-95 system, the frequency-reuse factor is normally _____. |
| | A) | 1 |
| | B) | 3 |
| | C) | 5 |
| | D) | 7 |
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| 52 | |
In the third generation of cellular phones, _______ uses W-CDMA. |
| | A) | IMT-DS |
| | B) | IMT-MC |
| | C) | IMT-TC |
| | D) | IMT-SC |
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| 53 | |
In the third generation of cellular phones, ______ uses a combination of W-CDMA and TDMA. |
| | A) | IMT-DS |
| | B) | IMT-MC |
| | C) | IMT-TC |
| | D) | IMT-SC |
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| 54 | |
In the third generation of cellular phones, _______ uses only TDMA. |
| | A) | IMT-DS |
| | B) | IMT-MC |
| | C) | IMT-TC |
| | D) | IMT-SC |
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| 55 | |
To increase efficiency, capacity and scalability, new access techniques are being considered such as _______ considered for 4G cellular phones. |
| | A) | OFDMA |
| | B) | IFDMA |
| | C) | MC-CDMA |
| | D) | All choices are correct |
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| 56 | |
The fourth generation cellular phones uses a _____________. |
| | A) | hardware-defined radio |
| | B) | software-defined radio |
| | C) | hardware- and software-defined radio |
| | D) | None of choices are correct. |
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| 57 | |
The fourth generation cellular phones uses _____________ antenna. |
| | A) | MIMO |
| | B) | MU-MIMO |
| | C) | MIMO and MU-MIMO |
| | D) | None of choices are correct. |
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| 58 | |
WiMax is an IEEE standard for a ________ wireless system |
| | A) | fixed |
| | B) | mobile |
| | C) | both fixed and mobile |
| | D) | None of choices are correct. |
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| 59 | |
WiMax aims to |
| | A) | replace WiFi |
| | B) | compete with WiFi |
| | C) | provide the "last mile" broadband wireless access alternative to cable and DSL |
| | D) | None of choices are correct. |
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| 60 | |
The period of a satellite, the time required for a satellite to make a complete trip around the Earth, is determined by _________ law. |
| | A) | Kepler's |
| | B) | Newton's |
| | C) | Ohm's |
| | D) | None of the choices are correct. |
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| 61 | |
The signal from a satellite is normally aimed at a specific area called the _________. |
| | A) | path |
| | B) | effect |
| | C) | footprint |
| | D) | None of the choices are correct. |
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| 62 | |
There is (are) _____ orbit(s) for a GEO satellite. |
| | A) | one |
| | B) | two |
| | C) | three |
| | D) | None of the choices are correct. |
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| 63 | |
______ is based on a principle called trilateration. |
| | A) | GPS |
| | B) | Teledesic |
| | C) | Iridium |
| | D) | None of the choices are correct. |
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| 64 | |
Low-Earth-orbit (LEO) satellites have _____ orbits. |
| | A) | equatorial |
| | B) | polar |
| | C) | inclined |
| | D) | None of the choices are correct. |
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| 65 | |
A GEO have ________ orbit and revolves in phase with Earth. |
| | A) | equatorial |
| | B) | polar |
| | C) | inclined |
| | D) | None of the choices are correct. |
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| 66 | |
GPS satellites are ________ satellites. |
| | A) | GEO |
| | B) | MEO |
| | C) | LEO |
| | D) | None of the choices are correct. |
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| 67 | |
________ satellites provide time and location information for vehicles and ships. |
| | A) | GPS |
| | B) | Iridium |
| | C) | Teledesic |
| | D) | None of the choices are correct. |
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| 68 | |
To solve the network addressing problem, a mobile host _____________________. |
| | A) | uses DHCP to change its address as it goes to a new network |
| | B) | uses two addresses: the home address, and the care-of address. |
| | C) | borrows an address from the foreign network |
| | D) | None of the choices are correct. |
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| 69 | |
For agent solicitation, Mobile IP uses _________________________. |
| | A) | a new packet type |
| | B) | solicitation packet of IP |
| | C) | solicitation packet of TCP |
| | D) | the router solicitation packet of ICMP |
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| 70 | |
A registration request or reply is sent by _____ using the well-known port 434. |
| | A) | UDP |
| | B) | TCP |
| | C) | UDP or TCP |
| | D) | None of the choices are correct. |
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