NCS 30022301010 NCSP LTE RA OaM 2 2 Practice Exam
**Question 1.** Which LTE network element is primarily responsible for user
plane data forwarding between the eNodeB and the external packet data
network?
A) MME
B) S‑GW
C) P‑GW
D) HSS
Answer: C
Explanation: The Packet Data Network Gateway (P‑GW) terminates the user plane,
routing user traffic to and from external IP networks.
**Question 2.** The S1‑MME interface carries which type of traffic?
A) User plane IP packets
B) Control plane signaling (NAS, S1‑AP)
C) Radio resource management messages
D) Backhaul transport of RF samples
Answer: B
Explanation: S1‑MME is the control‑plane interface between eNodeB and MME,
carrying S1‑AP signaling for session and mobility management.
**Question 3.** In LTE, which protocol is used on the uplink for data transmission
from UE to eNodeB?
A) OFDMA
, NCS 30022301010 NCSP LTE RA OaM 2 2 Practice Exam
B) SC‑FDMA
C) CDMA
D) TDMA
Answer: B
Explanation: LTE uses Single‑Carrier FDMA (SC‑FDMA) on the uplink to reduce the
peak‑to‑average power ratio (PAPR) for UE transmitters.
**Question 4.** The primary function of the Mobility Management Entity (MME)
is:
A) Routing user plane packets
B) Performing radio resource scheduling
C) Managing NAS signaling, authentication, and mobility
D) Converting microwave to optical signals
Answer: C
Explanation: MME handles control‑plane tasks such as NAS signaling,
authentication, bearer setup, and tracking area management.
**Question 5.** Which LTE physical channel carries Downlink Control Information
(DCI) to the UE?
A) PDSCH
B) PDCCH
C) PBCH
D) PUCCH
, NCS 30022301010 NCSP LTE RA OaM 2 2 Practice Exam
Answer: B
Explanation: The Physical Downlink Control Channel (PDCCH) transports DCI,
which tells the UE how to decode the PDSCH.
**Question 6.** In LTE, the X2 interface is used for:
A) Connecting eNodeB to the EPC core
B) Inter‑eNodeB communication for handover and load balancing
C) Transporting user data over Ethernet
D) Signaling between UE and eNodeB
Answer: B
Explanation: X2 links eNodeBs directly, enabling handover coordination and
sharing of load information.
**Question 7.** Which of the following is a key benefit of Carrier Aggregation
(CA) in LTE‑Advanced?
A) Reducing latency to sub‑millisecond levels
B) Combining multiple component carriers to increase bandwidth
C) Providing voice services over circuit‑switched network
D) Eliminating the need for a P‑GW
Answer: B
Explanation: CA aggregates several component carriers (CCs) to expand overall
bandwidth and boost peak data rates.
, NCS 30022301010 NCSP LTE RA OaM 2 2 Practice Exam
**Question 8.** The term “PCI” in LTE configuration stands for:
A) Physical Cell Identity
B) Packet Control Interface
C) Primary Carrier Index
D) Power Control Indicator
Answer: A
Explanation: PCI uniquely identifies a cell’s physical layer characteristics (PSS/SSS)
within the network.
**Question 9.** Which scheduling algorithm aims to balance throughput and
fairness by allocating resources proportionally to each user’s average rate?
A) Round Robin
B) Maximum Throughput
C) Proportional Fairness
D) First‑Come‑First‑Served
Answer: C
Explanation: Proportional Fairness considers both instantaneous channel quality
and past average rates to ensure fairness while exploiting good channel
conditions.
**Question 10.** In LTE, the RRC Connection Setup procedure is initiated by:
A) The MME sending a NAS Attach Request
B) The UE sending an RRC Connection Request message
**Question 1.** Which LTE network element is primarily responsible for user
plane data forwarding between the eNodeB and the external packet data
network?
A) MME
B) S‑GW
C) P‑GW
D) HSS
Answer: C
Explanation: The Packet Data Network Gateway (P‑GW) terminates the user plane,
routing user traffic to and from external IP networks.
**Question 2.** The S1‑MME interface carries which type of traffic?
A) User plane IP packets
B) Control plane signaling (NAS, S1‑AP)
C) Radio resource management messages
D) Backhaul transport of RF samples
Answer: B
Explanation: S1‑MME is the control‑plane interface between eNodeB and MME,
carrying S1‑AP signaling for session and mobility management.
**Question 3.** In LTE, which protocol is used on the uplink for data transmission
from UE to eNodeB?
A) OFDMA
, NCS 30022301010 NCSP LTE RA OaM 2 2 Practice Exam
B) SC‑FDMA
C) CDMA
D) TDMA
Answer: B
Explanation: LTE uses Single‑Carrier FDMA (SC‑FDMA) on the uplink to reduce the
peak‑to‑average power ratio (PAPR) for UE transmitters.
**Question 4.** The primary function of the Mobility Management Entity (MME)
is:
A) Routing user plane packets
B) Performing radio resource scheduling
C) Managing NAS signaling, authentication, and mobility
D) Converting microwave to optical signals
Answer: C
Explanation: MME handles control‑plane tasks such as NAS signaling,
authentication, bearer setup, and tracking area management.
**Question 5.** Which LTE physical channel carries Downlink Control Information
(DCI) to the UE?
A) PDSCH
B) PDCCH
C) PBCH
D) PUCCH
, NCS 30022301010 NCSP LTE RA OaM 2 2 Practice Exam
Answer: B
Explanation: The Physical Downlink Control Channel (PDCCH) transports DCI,
which tells the UE how to decode the PDSCH.
**Question 6.** In LTE, the X2 interface is used for:
A) Connecting eNodeB to the EPC core
B) Inter‑eNodeB communication for handover and load balancing
C) Transporting user data over Ethernet
D) Signaling between UE and eNodeB
Answer: B
Explanation: X2 links eNodeBs directly, enabling handover coordination and
sharing of load information.
**Question 7.** Which of the following is a key benefit of Carrier Aggregation
(CA) in LTE‑Advanced?
A) Reducing latency to sub‑millisecond levels
B) Combining multiple component carriers to increase bandwidth
C) Providing voice services over circuit‑switched network
D) Eliminating the need for a P‑GW
Answer: B
Explanation: CA aggregates several component carriers (CCs) to expand overall
bandwidth and boost peak data rates.
, NCS 30022301010 NCSP LTE RA OaM 2 2 Practice Exam
**Question 8.** The term “PCI” in LTE configuration stands for:
A) Physical Cell Identity
B) Packet Control Interface
C) Primary Carrier Index
D) Power Control Indicator
Answer: A
Explanation: PCI uniquely identifies a cell’s physical layer characteristics (PSS/SSS)
within the network.
**Question 9.** Which scheduling algorithm aims to balance throughput and
fairness by allocating resources proportionally to each user’s average rate?
A) Round Robin
B) Maximum Throughput
C) Proportional Fairness
D) First‑Come‑First‑Served
Answer: C
Explanation: Proportional Fairness considers both instantaneous channel quality
and past average rates to ensure fairness while exploiting good channel
conditions.
**Question 10.** In LTE, the RRC Connection Setup procedure is initiated by:
A) The MME sending a NAS Attach Request
B) The UE sending an RRC Connection Request message
