2.  In Explicit Reservation (Reservation Aloha), collisions is possible in: A.ALOHA mode B.Reserved mode C.Both modes

3.  A starts sending to B, C does not receive this transmission. C also wants to send something to B and senses the medium. The medium appears to be free, the carrier sense fails. C also starts sending causing a collision at B. A.Hidden terminals B.Exposed terminals C.Near and far terminals

4.  Multinumbering in GSM is an example of: A.Bearer Services B.Telematic Services C.Supplementary Services

5.  In GSM, which of the following is NOT part of the Operation Subsystem (OSS) A.Operation and Maintenance Center (OMC) B.Authentication Center (AUC) C.Home Location Register (HLR) D.Equipment Identity Register (EIR)

6. In Base Station Subsystem (BSS) of GSM: A.Each Base Station Controller (BSC) is connected to only one Base Transceiver Station (BTS). B.Each Base Station Controller (BSC) is connected to many Base Transceiver Stations (BTS). C.Each Base Transceiver Station (BTS) is connected to many Base Station Controllers (BSC).

7.  The International Mobile Subscriber Identity (IMSI) A.Uniquely identifies the mobile device B.Uniquely identifies the Subscriber Identity Module (SIM card) C.Used to hide the identity of the user for security purposes

8.  Which of the following is considered an internal handover: A.transferring a call between cells within the same BSS B.transferring a call between cells within the same MSC C.transferring a call between cells within different MSCs

9.  Which of the following is used to transmit user data A.Traffic channels (TCH) B.Common control channel (CCCH) C.Dedicated control channel (DCCH)

10.  Handover decision is based on: A.Received signal strength B.Distance of MS from BTS C.Drops below power budget margin D.All of the above

11.  The VLR contains data from: A.HLR of the same provider B.HLR of other providers C.Both A and B are correct

12.  Power control is very important in wireless networks to solve: A. hidden terminal problem B. exposed terminal problem C. near & far terminals problem

13.  Devise a frequency division duplex scheme that allocated the frequency band 500 – 600 MHz to 200 users. What will be the bandwidth available for each user? Assume a guard of 20 MHz is required between the uplink and downlink connections A.200 KHz B.400 KHz C.500 KHz