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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 a 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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