Question

Chapter 18: wireless networks

TRUE OR FALSE

                                                                                                   

T          F          1. As the demand for broadband Internet access has grown, providers

of wired local loop service have responded with increasing reliance   on optical fiber and coaxial cable.

T          F          2. A BWA provider services one or more cells.

T          F          3. Wireless systems are more expensive than wired systems.

T          F          4. IEEE 802.16 and the associated WiMAX specification now deal with

     both fixed and mobile BWA.

T          F          5. A NAP is a business entity that provides WiMAX radio access

     infrastructure to one or more WiMAX Service Providers.

T          F          6. Secure communication between the subscriber station and the CSN

      is handled at the security sublayer.

T          F          7. A TDMA time slot may contain exactly one MAC PDU, a fraction of a

     MAC PDU, or multiple MAC PDUs.

T          F          8. The 802.16 MAC protocol is connection oriented.

T          F          9. A MAC PDU with a generic header contains either MAC

     management messages or convergence sublayer data.

T          F          10. UGS is commonly used for uncompressed audio and video

        information.

T          F          11. File transfer is an example of an ERT-VR service.

T          F          12. The IEEE 802.16 physical layer set of standards is still evolving

and is not stable enough to form the basis of widespread WiMAX implementation and deployment.

T          F          13. Both WirelessMAN-OFDM and WirelessMAN-OFDMA are suitable

        for an environment that includes mobile SSs.

T          F          14. RFCOMM is the cable replacement protocol included in the

        Bluetooth specification.

T          F          15. Bluetooth incorporates the wireless application environment and

        the wireless application protocol into its architecture.

MULTIPLE CHOICE

1. WiMAX is based on the ______ standard.

A) IEEE 802.11                      B) IEEE 802.11a

C) IEEE 802.13                      D) IEEE 802.16

2. The key stumbling blocks in installing ______ systems are obtaining permission to use a given frequency band and finding a suitable elevated site for the BS antennas.

1. WBA                      B) BWA

C) WLL                       D) WCL

3. The set of network functions needed to provide radio access to WiMAX subscribers is:

A) CSN                        B) ASN

C) NAP                        D) NSP

4. A ________ is a set of network functions that provide IP connectivity services to WiMAX subscribers.

A) Network Service Provider           B) Access Service Network

C) Connectivity Service Network     D) Network Access Provider

5. _______ applications transmit at a rate that varies with time.

1. RT-VR                   B) UGS

C) ERT-VR                  D) all of the above

6. The _______ service is to support real-time applications with variable data rates, which require guaranteed data and delay.

A) NRT-VR                 B) ERT- VR

C) FPS                         D) BE

7. The _______ service is suitable for applcations that can tolerate variable delays and rates.

A) nrtPS                      B) NRT-VR

C) BE                           D) rtPS

8. _______ employs a single, relatively large, uplink frequency band that is used to transmit a sequence of time slots.

1. DAMA                   B) TDMA

C) LOS                         D) RT-VR

9. The _________ is an Internet standard protocol for transporting IP datagrams over a point-to-point link.

A) OBEX                      B) TCP/IP      

C) WAP                       D) PPP

10. A ________ consists of a master and from one to seven active slave devices.

1. piconet                  B) wireless local loop

C) scatternet              D) unsolicited grant service

11. The header format for all Bluetooth packets consists of ______ fields.

A) four                        B) six

C) eight                       D) ten

12. Bluetooth defines _______ types of logical data channels designated to carry different types of payload traffic.

A) two                         B) three

C) four                        D) five

13. A _________ is a set of parameters that indicate a performance level that the transmiter will attempt to achieve.

A) flow specification             B) scatternet

C) piconet                               D) TDMA burst

14. The _________ is the maximum acceptable delay between transmission of a bit by the sender and its initial transmission over the air, expressed in microseconds.

1. peak bandwidth               B) token rate

C) latency                               D) delay variation

15. The _________ is the difference, in microseconds, between the maximum and minimum possible delay that a packet will experience.

A) delay variation                  B) latency

C) token rate                          D) peak bandwidth

Answer 1

1. T

2. F

3. T

4. F

5. T

2. 16. WiMAX is based on the IEEE 802.16 standard. (D)

18. The set of network functions needed to provide radio access to WiMAX subscribers is: ASN