NCS 30022201010 NCSP 3G RA OaM 2 2 Practice Exam
Question 1. **Which interface connects the Radio Network Controller (RNC) to
the Circuit‑Switched Core Network?**
A) Iub
B) Iu‑CS
C) Iu‑PS
D) Uu
Answer: B
Explanation: Iu‑CS is the standardized interface between the RNC and the MSC for
circuit‑switched services.
Question 2. **The Uu interface is defined as which of the following?**
A) RNC‑Node B transport link
B) Core network back‑haul link
C) Radio link between Node B and UE
D) Signalling link between RNC and MSC
Answer: C
Explanation: Uu is the over‑the‑air interface that carries both user and control
plane traffic between the UE and Node B.
Question 3. **In a 3G Node B, the component responsible for digital baseband
processing is called:**
A) TRX (Transceiver Unit)
B) RF front‑end module
, NCS 30022201010 NCSP 3G RA OaM 2 2 Practice Exam
C) Baseband Unit (BBU)
D) Power Amplifier (PA)
Answer: C
Explanation: The Baseband Unit performs channel coding, modulation, and other
digital baseband functions.
Question 4. **Which protocol layer in the UTRAN stack handles radio resource
allocation and measurement reporting?**
A) MAC
B) RRC
C) RLC
D) Physical layer
Answer: B
Explanation: The Radio Resource Control (RRC) layer manages radio resources,
mobility, and measurement reporting.
Question 5. **The Iub interface primarily carries traffic between which two
network elements?**
A) UE and Node B
B) RNC and Node B
C) RNC and MSC
D) Node B and SGSN
Answer: B
, NCS 30022201010 NCSP 3G RA OaM 2 2 Practice Exam
Explanation: Iub is the transport interface linking the RNC to its controlled
Node B(s).
Question 6. **Which of the following is a function of the RLC layer in UMTS?**
A) Scheduling of HARQ retransmissions
B) Ciphering of user data
C) Segmentation and concatenation of PDUs
D) Power control loop execution
Answer: C
Explanation: The Radio Link Control (RLC) layer provides segmentation,
concatenation, and retransmission (ARQ) of data.
Question 7. **What does the acronym “OVSF” stand for in the context of UMTS
code management?**
A) Orthogonal Variable Spreading Factor
B) Optimized Voice Service Framework
C) Over‑the‑air Variable Signalling Format
D) Open‑Virtual Service Function
Answer: A
Explanation: OVSF codes are orthogonal spreading codes with variable spreading
factors used for channel multiplexing.
, NCS 30022201010 NCSP 3G RA OaM 2 2 Practice Exam
Question 8. **During cell definition, which parameter uniquely identifies a UMTS
cell on the radio interface?**
A) Primary Scrambling Code (PSC)
B) Cell Global Identity (CGI)
C) Tracking Area Code (TAC)
D) PLMN ID
Answer: A
Explanation: The Primary Scrambling Code distinguishes each cell on the Uu
interface.
Question 9. **Which KPI measures the proportion of successful circuit‑switched
call set‑ups to total attempts?**
A) CS CSSR
B) PS S‑SSR
C) Call Drop Rate (CDR)
D) Handover Success Rate (HSR)
Answer: A
Explanation: CS CSSR (Circuit‑Switched Call Setup Success Rate) reflects successful
CS call establishments.
Question 10. **A high value of “Ec/No” observed in drive‑test data indicates:**
A) Low interference and good signal quality
B) High path loss and poor coverage
Question 1. **Which interface connects the Radio Network Controller (RNC) to
the Circuit‑Switched Core Network?**
A) Iub
B) Iu‑CS
C) Iu‑PS
D) Uu
Answer: B
Explanation: Iu‑CS is the standardized interface between the RNC and the MSC for
circuit‑switched services.
Question 2. **The Uu interface is defined as which of the following?**
A) RNC‑Node B transport link
B) Core network back‑haul link
C) Radio link between Node B and UE
D) Signalling link between RNC and MSC
Answer: C
Explanation: Uu is the over‑the‑air interface that carries both user and control
plane traffic between the UE and Node B.
Question 3. **In a 3G Node B, the component responsible for digital baseband
processing is called:**
A) TRX (Transceiver Unit)
B) RF front‑end module
, NCS 30022201010 NCSP 3G RA OaM 2 2 Practice Exam
C) Baseband Unit (BBU)
D) Power Amplifier (PA)
Answer: C
Explanation: The Baseband Unit performs channel coding, modulation, and other
digital baseband functions.
Question 4. **Which protocol layer in the UTRAN stack handles radio resource
allocation and measurement reporting?**
A) MAC
B) RRC
C) RLC
D) Physical layer
Answer: B
Explanation: The Radio Resource Control (RRC) layer manages radio resources,
mobility, and measurement reporting.
Question 5. **The Iub interface primarily carries traffic between which two
network elements?**
A) UE and Node B
B) RNC and Node B
C) RNC and MSC
D) Node B and SGSN
Answer: B
, NCS 30022201010 NCSP 3G RA OaM 2 2 Practice Exam
Explanation: Iub is the transport interface linking the RNC to its controlled
Node B(s).
Question 6. **Which of the following is a function of the RLC layer in UMTS?**
A) Scheduling of HARQ retransmissions
B) Ciphering of user data
C) Segmentation and concatenation of PDUs
D) Power control loop execution
Answer: C
Explanation: The Radio Link Control (RLC) layer provides segmentation,
concatenation, and retransmission (ARQ) of data.
Question 7. **What does the acronym “OVSF” stand for in the context of UMTS
code management?**
A) Orthogonal Variable Spreading Factor
B) Optimized Voice Service Framework
C) Over‑the‑air Variable Signalling Format
D) Open‑Virtual Service Function
Answer: A
Explanation: OVSF codes are orthogonal spreading codes with variable spreading
factors used for channel multiplexing.
, NCS 30022201010 NCSP 3G RA OaM 2 2 Practice Exam
Question 8. **During cell definition, which parameter uniquely identifies a UMTS
cell on the radio interface?**
A) Primary Scrambling Code (PSC)
B) Cell Global Identity (CGI)
C) Tracking Area Code (TAC)
D) PLMN ID
Answer: A
Explanation: The Primary Scrambling Code distinguishes each cell on the Uu
interface.
Question 9. **Which KPI measures the proportion of successful circuit‑switched
call set‑ups to total attempts?**
A) CS CSSR
B) PS S‑SSR
C) Call Drop Rate (CDR)
D) Handover Success Rate (HSR)
Answer: A
Explanation: CS CSSR (Circuit‑Switched Call Setup Success Rate) reflects successful
CS call establishments.
Question 10. **A high value of “Ec/No” observed in drive‑test data indicates:**
A) Low interference and good signal quality
B) High path loss and poor coverage
