Cau hoi-trac-nghiem-thong-tin-di-dong-co-dap-an 2

1. Trắc nghiệm thông tin di động
1.6 TEST
Which of the answers below are correct?
1. In a digital cellular mobile radio network
a. The subscribers can access the network via a radio interface
b. The base stations are interconnected
c. Radio cells are served by base stations
2. In the GSM*/DCS mobile radio network
a. The radio interface is digital
b. The radio interface is analog
c. the mobile subscriber identifies himself by entering a number at the terminal
d. The mobile subscriber can make a call from any approved terminal
*​GSM (Global System for Mobile Communications): Hệ thống thông tin di động toàn cầu
4.​ ​A subscriber has inserted his SIM card into the mobile equipment this means that
a. The subscriber can now be reached
b. the subscriber can from now on only make emergency calls
c. The subscriber can use his telecommunication services
3. Is the statement below correct?
The supplementary service “call forwarding” can be used only in conjunction with a basic
service. ​>>​ ​YES.
2.9 TEST
2.9.1. Which network component performs the authentication?
a. EIR b. VLR c. AC* d. BTS
2.9.2 Which network components are ​always involved in establishing a traffic channel
connection?
a. MSC b. HLR c. EIR d. BSC e. AC* f. BTS
*AC (Authentication Cent: AuC): Trung tâm nhận thựcre
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2. 2.9.3 Name the signaling system via which the SSS(Switching Subsystem) network
components communicate with each other.
>> ​CCS7 ​stands for "Callsign Communication System" (or sometimes Call Connection
Service)
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3. 2.9.4 Which type of physical connection is between MSC and BSC?
a. Radio
b. PCM30​ ​(​Pulse Code Modulation)
c. LAPD (Link Access Protocol D-Channel)
3.9 TEST
3.9.1 The bandwidth of the radio frequency channels (RFC) is:
a. 200 kHz in GSM 900 and 400 kHz in DCS 1800
b. 35 MHz in GSM 900 and in DCS 1800
c. 200 kHz in GSM 900 and in DCS 1800
*DCS (Digital Cellular System)
3.9.2 The time division of a carrier into time slots is called:
a. FDMA (Frequency division multiple access)
b. TDMA(Time division multiple access)
c. PCM (​Pulse Code Modulation)
3.9.3 On the GSM/DCS radio interface
a. one RFC represents one time slot
b. a combination of FDMA and TDMA is used
c. a physical channel is defined by an RFC and by a time slot number in the
TDMA frame
3.9.4 Via which type of control channel is the signaling information carried after a traffic
channel (TCH) has been provided?
a. Common Control Channel CCH
b. Associated Control Channel ACCH
c. Dedicated Control Channel DCCH
d. Broadcast Channel BCH
3.9.5 What is the term for a bit sequence with a uniquely defined format, which is transmitted
in a TDMA frame?
>> BURST​ (cụm)
4.7 TEST
4.7.1 24 physical channels shall be available in a cell. How many TDMA systems are
needed in the BTS?
a. 24
b. 3
c. 1
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4. 4.6 TEST
4.6.2 Which of the tasks below are handled by the TRAU(Transcoder and Adaptive Unit)?
*TRAU: Bộ chuyển đổi mã và thích ứng tốc độ.
a. Rate adaptation for data services
b. Transcoding of speed signals
c. Administration of radio frequencies
d. Submultiplexing from 4 ​x ​16Kbit/s to 64Kbit/s
e. Transparent switching through of signaling information
4.6.3 Which network components in the SSS(​Switching Subsystem) and BSS(Base Station
Subsystem) require a control for the CCS7 signaling channels?
a. BTS
b. HLR/AC
c. MSC/VLR
d. BSC
e. TRAU
5.5 TEST
5.5.1
a. VLR A
*LAC (Location Area Code) || CI: Cell Identity
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5. 6.6.1. A mobile subscriber is not able to make a call and reports this to you, the operation
and maintenance specialist.
Which number do you need to know in order to find out the HLR where the subscriber is
administrated?
a. IMSI (International Mobile Subscriber Identity)*
b. MSISDN​ ​(Mobile Subscriber ISDN Number)
c. TMSI (Temporary Mobile Subscriber Identity)
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6. 6.6.3 What digit combination is stored always and unchanged on the SIM (Subscriber Identity
Module) card?
a. IMSI*
b. MSISDN
c. TMSI
*​IMSI (International Mobile Subscriber Identity). IMSI là chuỗi số kết hợp Mobile Country Code(MCC)+
Mobile Network Code(MNC) + Mobile Subscriber Identification Number(MSIN).
7.8 TEST
7.8.1 How is the code used for radio channel ciphering abbreviated?
a. Ki* b. RAND c. Kc ​(Cipher Key)
*Ki (Individual Subscriber authentication Key)
7.8.2 Indicate the location data stored in the HLR after a location update has been
performed.
a. TMSI
b. VLR number​: Địa chỉ báo hiệu quốc tế của VLR
c. CGI (= MCC + MNC + LAC + CI) Cell Global Identity
d. LMSI ​(Local Mobile Station Identity): Địa chỉ dữ liệu thuê bao của VLR
e. SRES: đáp ứng báo hiệu (như là thông số tham khảo cho việc nhận thực)
7.8.3 Which network component assigns a TMSI to a mobile subscriber/
a. MSC (Mobile service Switching Centre): Trung tâm chuyển mạch và các dịch vụ dđ.
b. EIR (Equipment Identity Register): Thanh ghi nhận dạng thiết bị
c. VLR (Visitor Location Register): Bộ ghi định vị tạm trú
d. HLR (Home ​Location Register): Bộ ghi định vị thường trú
7.8.4 What is the “​Interrogation​”?
a. Questioning of the MSC data base
b. The process of determining a mobile subscriber’s current cell
c. Questioning of the HLR about routing information to the visited MSC
7.8.5 Which network components decides that a handover must be carried out?
a. BSC (Base Station Controller): Bộ điều khiển trạm gốc
b. BTS (Base Transceiver Station): Trạm thu phát gốc
c. VLR
7.8.6 A BSC remarks that there is another cell, also served by this BSC, which offers a
higher receive level for a certain connection.
What kind of handover is required?
a. Intra-cell handover
b. Inter-cell handover
c. Intra-MSC handover
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7. d. Inter-MSC handover
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