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5G Network MCQs (Multiple-Choice Questions)

Practice 5G Network MCQs to test your knowledge of 5G architecture, New Radio, core network functions, radio access technologies, network slicing, and mobile communication systems. These questions help you understand how 5G networks provide higher capacity, lower latency, flexible connectivity, and support for diverse applications and devices. The set includes both foundational and practical questions covering modern 5G network systems.

5G Network MCQs

These 5G Network multiple-choice questions cover important concepts such as 5G NR, NG-RAN, gNB, 5G Core, AMF, SMF, UPF, AUSF, UDM, PCF, NRF, service-based architecture, network slicing, QoS, 5QI, beamforming, massive MIMO, OFDM, subcarrier spacing, numerology, mmWave, spectrum, carrier aggregation, dual connectivity, handover, edge computing, URLLC, eMBB, mMTC, private 5G networks, network security, non-public networks, and 5G-Advanced features. This set combines conceptual, technical, and scenario-based questions to help test your understanding of 5G network systems.

5G Network MCQs cover the technologies used to provide high-speed wireless connectivity, flexible network services, low-latency communication, massive device connectivity, and programmable mobile network infrastructure. Each question includes an answer and explanation.

List of 5G Network MCQs

The following 5G Network multiple-choice questions cover 5G radio access, core network architecture, protocols, radio technologies, network slicing, QoS, edge computing, private networks, and advanced 5G deployments.

1. What does 5G NR stand for?

  1. 5G New Radio
  2. 5G Network Routing
  3. 5G Node Relay
  4. 5G Network Resource

Answer: A) 5G New Radio

Explanation:

5G NR is the radio access technology specified by 3GPP for 5G wireless communication.

2. Which organization develops the primary global specifications for 5G NR and the 5G System?

  1. 3GPP
  2. IEEE only
  3. W3C
  4. ICANN

Answer: A) 3GPP

Explanation:

3GPP develops the specifications for cellular technologies including 5G NR and the 5G System. The 5G System architecture is specified in documents such as 3GPP TS 23.501.

3. What is the primary role of the 5G RAN?

  1. Provide wireless radio connectivity between user equipment and the core network
  2. Store subscriber billing records only
  3. Generate application-layer content
  4. Replace the Internet backbone

Answer: A) Provide wireless radio connectivity between user equipment and the core network

Explanation:

The Radio Access Network provides the wireless access portion of the 5G system and connects user equipment to the 5G Core.

4. What is the primary 5G NR base station called?

  1. gNB
  2. eNB
  3. SGSN
  4. GGSN

Answer: A) gNB

Explanation:

The gNB, or next-generation NodeB, is the 5G NR base station that provides radio access to user equipment.

5. What does NG-RAN refer to?

  1. Next Generation Radio Access Network
  2. New Gateway Routing Access Network
  3. Network Gateway Radio Authentication Node
  4. Next Generation Routing Application Network

Answer: A) Next Generation Radio Access Network

Explanation:

NG-RAN is the 5G radio access network architecture defined by 3GPP. It includes 5G NR nodes such as gNBs.

6. Which interface connects the 5G NG-RAN to the 5G Core?

  1. NG interface
  2. Um interface
  3. Gb interface
  4. Gi interface

Answer: A) NG interface

Explanation:

The NG interface connects the NG-RAN with the 5G Core. Its control-plane and user-plane functions use separate logical interfaces, including N2 and N3.

7. What is the primary function of the N2 interface in a 5G network?

  1. Carry control-plane signaling between NG-RAN and AMF
  2. Carry user data between UPF and the Internet
  3. Connect the UE directly to the application server
  4. Provide power to the gNB

Answer: A) Carry control-plane signaling between NG-RAN and AMF

Explanation:

N2 is the control-plane interface between the NG-RAN and the Access and Mobility Management Function.

8. What is the primary purpose of the N3 interface?

  1. Carry user-plane traffic between NG-RAN and UPF
  2. Carry subscriber authentication information between UDM and AUSF
  3. Connect the AMF to the UDM
  4. Connect two application servers

Answer: A) Carry user-plane traffic between NG-RAN and UPF

Explanation:

N3 transports user-plane traffic between the 5G radio access network and the User Plane Function.

9. What is the primary role of the 5G Core (5GC)?

  1. Provide core network functions for connectivity, mobility, sessions, policy, authentication, and services
  2. Replace all radio antennas
  3. Generate radio-frequency energy only
  4. Act only as a DNS server

Answer: A) Provide core network functions for connectivity, mobility, sessions, policy, authentication, and services

Explanation:

The 5G Core provides a collection of network functions that manage access, mobility, sessions, user-plane connectivity, authentication, policy, subscriber data, and other services.

10. What does AMF stand for in the 5G Core?

  1. Access and Mobility Management Function
  2. Application Management Framework
  3. Advanced Mobile Firewall
  4. Access Media Forwarder

Answer: A) Access and Mobility Management Function

Explanation:

The AMF handles important control-plane functions related to access and mobility management, including registration and connection management.

11. Which 5G Core function is responsible primarily for establishing and managing PDU sessions?

  1. SMF
  2. AMF
  3. UDM
  4. NRF

Answer: A) SMF

Explanation:

The Session Management Function manages PDU sessions, including session establishment, modification, and release, and controls relevant user-plane resources.

12. What is the primary role of the UPF?

  1. Handle user-plane traffic and provide connectivity toward data networks
  2. Perform subscriber authentication only
  3. Manage radio beamforming only
  4. Store permanent subscriber profiles

Answer: A) Handle user-plane traffic and provide connectivity toward data networks

Explanation:

The User Plane Function forwards and processes user traffic. It can also support functions such as traffic steering, packet inspection, and local breakout depending on deployment.

13. Which 5G Core function is responsible for subscriber data management?

  1. UDM
  2. UPF
  3. SMF
  4. gNB

Answer: A) UDM

Explanation:

The Unified Data Management function supports subscriber-related data management and services used by other 5G Core network functions.

14. What is the primary purpose of AUSF in the 5G Core?

  1. Support authentication of the user equipment
  2. Forward application data packets
  3. Control antenna beam direction
  4. Manage radio scheduling

Answer: A) Support authentication of the user equipment

Explanation:

The Authentication Server Function supports the authentication procedures used to authenticate subscribers and establish secure access to the 5G system.

15. What is the purpose of the PCF in a 5G network?

  1. Provide policy control information to network functions
  2. Generate radio signals
  3. Store physical SIM cards
  4. Perform packet routing exclusively

Answer: A) Provide policy control information to network functions

Explanation:

The Policy Control Function provides policy rules used for areas such as QoS and charging control.

16. What is the purpose of the NRF in the 5G Core?

  1. Support network function discovery and registration
  2. Transmit radio signals to smartphones
  3. Encrypt all user data directly
  4. Provide GPS positioning

Answer: A) Support network function discovery and registration

Explanation:

The Network Repository Function maintains information about available network functions and supports discovery of suitable services within the service-based 5G Core architecture.

17. What is a key characteristic of the 5G Core service-based architecture?

  1. Network functions expose services to other authorized network functions through defined service-based interfaces
  2. Every network function must communicate only through dedicated physical cables
  3. All network functions are combined into one monolithic process
  4. Only the RAN can access network services

Answer: A) Network functions expose services to other authorized network functions through defined service-based interfaces

Explanation:

The 5G Core uses a service-based architecture in which network functions interact through standardized services. This supports modularity and flexible deployment.

18. What does SBA stand for in 5G Core architecture?

  1. Service-Based Architecture
  2. Subscriber Broadband Access
  3. Secure Baseband Architecture
  4. System Band Allocation

Answer: A) Service-Based Architecture

Explanation:

Service-Based Architecture is a key design principle of the 5G Core, allowing network functions to expose and consume services.

19. Which 5G use case focuses on high-throughput mobile broadband services?

  1. eMBB
  2. URLLC
  3. mMTC
  4. SMS

Answer: A) eMBB

Explanation:

Enhanced Mobile Broadband, or eMBB, targets high data rates and increased capacity for applications such as high-resolution video and broadband connectivity.

20. Which 5G service category targets highly reliable communication with very low latency?

  1. URLLC
  2. eMBB
  3. mMTC
  4. NB-IoT only

Answer: A) URLLC

Explanation:

Ultra-Reliable Low-Latency Communication is designed for demanding applications requiring stringent latency and reliability characteristics, such as industrial automation.

21. What does mMTC primarily target?

  1. Massive connectivity for large numbers of devices
  2. Only high-end smartphones
  3. Only satellite television
  4. High-performance gaming computers

Answer: A) Massive connectivity for large numbers of devices

Explanation:

Massive Machine-Type Communications targets scenarios involving large populations of connected devices, particularly IoT applications.

22. What is network slicing in 5G?

  1. Creating logically differentiated network instances using shared infrastructure and resources
  2. Physically cutting a fiber cable into sections
  3. Dividing a SIM card into multiple pieces
  4. Removing the core network from a mobile network

Answer: A) Creating logically differentiated network instances using shared infrastructure and resources

Explanation:

Network slicing allows an operator to create logical network instances with different characteristics and policies for different services or groups of users. 3GPP describes slicing as a key feature of the 5G system architecture.

23. Which scenario is best suited to a low-latency, highly reliable 5G network slice?

  1. Industrial robotic control
  2. Bulk email synchronization
  3. Offline document storage
  4. Static website hosting

Answer: A) Industrial robotic control

Explanation:

Industrial control can require predictable latency and high reliability, making a suitably engineered URLLC-oriented network slice an appropriate use case.

24. What is 5QI used for in the 5G system?

  1. Identify standardized or configured QoS characteristics for a QoS flow
  2. Identify a subscriber's phone number
  3. Determine the gNB's geographic coordinates
  4. Specify the physical size of a SIM card

Answer: A) Identify standardized or configured QoS characteristics for a QoS flow

Explanation:

5QI is a QoS Identifier used to reference QoS characteristics associated with a QoS flow, such as priority and packet delay budget.

25. What is a QoS Flow in 5G?

  1. The finest granularity of QoS differentiation within a PDU session
  2. A physical radio cable
  3. A type of SIM card
  4. A satellite orbit

Answer: A) The finest granularity of QoS differentiation within a PDU session

Explanation:

5G uses QoS flows to provide differentiated treatment to traffic within a PDU session. QoS rules determine how packets are associated with QoS flows.

26. What is a PDU session in 5G?

  1. A logical association that provides UE connectivity to a data network
  2. A physical connection between two antennas
  3. A radio-frequency amplifier
  4. A subscriber identity number

Answer: A) A logical association that provides UE connectivity to a data network

Explanation:

A PDU session provides a UE with connectivity to a Data Network and is managed by the 5G Core's session-management functions.

27. What is beamforming in 5G NR?

  1. Controlling the phase and amplitude of antenna elements to direct radio energy
  2. Increasing SIM card storage
  3. Compressing IP packets
  4. Encrypting application data

Answer: A) Controlling the phase and amplitude of antenna elements to direct radio energy

Explanation:

Beamforming uses multiple antenna elements and signal-processing techniques to steer or shape radio-frequency energy toward desired directions.

28. What is massive MIMO?

  1. A multiple-input multiple-output system using a large number of antenna elements
  2. A packet encryption protocol
  3. A core-network authentication system
  4. A type of optical fiber

Answer: A) A multiple-input multiple-output system using a large number of antenna elements

Explanation:

Massive MIMO uses many antenna elements to improve spatial multiplexing, beamforming, coverage, and spectral efficiency.

29. What is one major advantage of massive MIMO in 5G?

  1. It can support spatial multiplexing of multiple users
  2. It eliminates the need for radio spectrum
  3. It removes all propagation loss
  4. It eliminates the need for antennas

Answer: A) It can support spatial multiplexing of multiple users

Explanation:

Massive MIMO can exploit spatial dimensions to simultaneously serve multiple users and improve spectral efficiency when channel conditions and processing permit.

30. Which multiple-access waveform technology forms the basis of the 5G NR downlink and uplink physical-layer waveforms?

  1. CP-OFDM
  2. AM radio
  3. FM radio
  4. Pure TDMA without OFDM

Answer: A) CP-OFDM

Explanation:

5G NR uses cyclic-prefix OFDM-based waveforms. The uplink can also use DFT-s-OFDM in specified configurations.

31. What does numerology in 5G NR primarily determine?

  1. Parameters such as subcarrier spacing and related OFDM timing
  2. The subscriber's billing address
  3. The number of SIM cards in a smartphone
  4. The IP address of the application server

Answer: A) Parameters such as subcarrier spacing and related OFDM timing

Explanation:

NR numerology is associated with different subcarrier spacings and corresponding OFDM symbol timing. Multiple numerologies allow NR to support different deployment and latency requirements.

32. What generally happens to OFDM symbol duration when subcarrier spacing is increased?

  1. The useful symbol duration decreases
  2. The useful symbol duration increases indefinitely
  3. The symbol disappears
  4. It becomes independent of subcarrier spacing

Answer: A) The useful symbol duration decreases

Explanation:

For OFDM, useful symbol duration is inversely related to subcarrier spacing. Higher subcarrier spacing therefore results in shorter symbols.

33. Why is higher-frequency spectrum such as millimeter-wave useful for 5G?

  1. It can provide access to large contiguous bandwidths
  2. It eliminates the need for antennas
  3. It propagates through all obstacles without attenuation
  4. It always provides greater coverage than low-band spectrum

Answer: A) It can provide access to large contiguous bandwidths

Explanation:

Higher-frequency bands can offer much wider channels, enabling high data rates. However, propagation loss, blockage, and penetration characteristics can make coverage more challenging.

34. Why is low-band 5G spectrum useful for wide-area coverage?

  1. It generally propagates farther and penetrates obstacles better than much higher-frequency bands
  2. It always provides unlimited bandwidth
  3. It requires no base stations
  4. It cannot support mobile users

Answer: A) It generally propagates farther and penetrates obstacles better than much higher-frequency bands

Explanation:

Lower-frequency radio waves generally experience more favorable propagation characteristics for wide-area coverage, although the available bandwidth is often more limited.

35. What is carrier aggregation in 5G?

  1. Combining multiple component carriers to increase available bandwidth
  2. Combining multiple SIM cards into one
  3. Combining multiple IP addresses into one packet
  4. Combining multiple users into one identity

Answer: A) Combining multiple component carriers to increase available bandwidth

Explanation:

Carrier aggregation allows a UE to use multiple component carriers together, increasing the effective bandwidth available for data transmission.

36. What is dual connectivity in 5G?

  1. A UE simultaneously uses resources from two radio nodes or connectivity legs
  2. A smartphone uses two SIM cards for authentication only
  3. Two users share one IP address
  4. A gNB uses two power supplies

Answer: A) A UE simultaneously uses resources from two radio nodes or connectivity legs

Explanation:

Dual connectivity allows a UE to maintain connectivity through multiple radio nodes, such as combinations involving LTE and NR or multiple NR nodes, depending on the deployment.

37. What is edge computing in a 5G network?

  1. Placing compute and application resources closer to users or devices
  2. Moving all applications to distant data centers
  3. Removing the 5G Core
  4. Replacing radio antennas with CPUs

Answer: A) Placing compute and application resources closer to users or devices

Explanation:

Edge computing can reduce network path length and latency by placing workloads near the access network or users. 3GPP continues to specify enhancements for edge computing support in the 5G Core.

38. Which application can benefit significantly from combining 5G with edge computing?

  1. Real-time industrial machine control
  2. Offline text editing
  3. Local file renaming
  4. Printed documents

Answer: A) Real-time industrial machine control

Explanation:

Industrial control can benefit from low-latency connectivity and nearby compute resources, particularly when rapid sensor processing and control decisions are required.

39. What is a Non-Public Network (NPN) in 5G?

  1. A 5G network intended for private or specific organizational use
  2. A public Internet DNS service
  3. A satellite-only network
  4. A network without authentication

Answer: A) A 5G network intended for private or specific organizational use

Explanation:

5G supports non-public networks for organizations such as factories, campuses, and enterprises that need dedicated or controlled network services. 3GPP has continued enhancing NPN support in later releases.

40. What is a Standalone 5G deployment?

  1. A deployment using 5G NR with a 5G Core without requiring an LTE EPC as the core
  2. A deployment using only 4G LTE
  3. A network without a core network
  4. A Wi-Fi-only deployment

Answer: A) A deployment using 5G NR with a 5G Core without requiring an LTE EPC as the core

Explanation:

5G Standalone, or SA, uses a 5G NR radio access network connected to the 5G Core. This enables native 5G Core capabilities such as service-based architecture and network slicing.

41. What is a non-standalone 5G deployment?

  1. A deployment where NR works with an existing LTE/EPC infrastructure
  2. A network with no radio access network
  3. A satellite-only network
  4. A network using only Wi-Fi

Answer: A) A deployment where NR works with an existing LTE/EPC infrastructure

Explanation:

5G NSA deployments use NR together with LTE infrastructure, allowing operators to introduce 5G radio access while retaining parts of the existing 4G network.

42. What is handover in a mobile network?

  1. The controlled transfer of a UE's connection from one serving cell or node to another
  2. Changing a user's password
  3. Replacing a SIM card
  4. Changing an application's source code

Answer: A) The controlled transfer of a UE's connection from one serving cell or node to another

Explanation:

Handover maintains service continuity as a mobile device moves between coverage areas or when radio conditions and network policies require a change of serving cell or node.

43. Which technique allows multiple users to be separated using spatial dimensions in a massive MIMO system?

  1. Spatial multiplexing
  2. Frequency shutdown
  3. Packet deletion
  4. Static routing

Answer: A) Spatial multiplexing

Explanation:

Spatial multiplexing uses different spatial channels created by multiple antennas to transmit separate data streams to multiple users or to one user.

44. Which security principle is especially important for a 5G network because many functions may be virtualized and exposed through software interfaces?

  1. Strong authentication, authorization, isolation, and secure service interfaces
  2. Disabling all encryption
  3. Allowing every network function unrestricted access
  4. Using a single shared administrator password

Answer: A) Strong authentication, authorization, isolation, and secure service interfaces

Explanation:

5G's software-driven architecture increases the importance of secure interfaces, identity management, access control, isolation, and protection of virtualized and cloud-native network functions.

45. What is Integrated Access and Backhaul (IAB) in 5G NR?

  1. Using NR radio resources for both access to users and wireless backhaul connectivity
  2. Combining a SIM card with an antenna
  3. Using only fiber for every base station
  4. Replacing the 5G Core with a router

Answer: A) Using NR radio resources for both access to users and wireless backhaul connectivity

Explanation:

IAB allows wireless backhaul and access to be integrated using NR, which can help deploy additional radio nodes where wired backhaul is difficult or expensive. 3GPP continues to specify IAB capabilities in later releases.

46. What is RedCap in the context of 5G?

  1. A reduced-capability NR device technology targeting lower-complexity use cases
  2. A high-power satellite antenna
  3. A new 5G encryption algorithm
  4. A replacement for the 5G Core

Answer: A) A reduced-capability NR device technology targeting lower-complexity use cases

Explanation:

NR RedCap, introduced in 3GPP Release 17, targets devices that need 5G capabilities but do not require the full performance and complexity of high-end NR devices. It is relevant to industrial sensors, wearables, and other moderate-data-rate applications.

47. What is network function virtualization (NFV) useful for in a 5G environment?

  1. Running network functions as software on virtualized or cloud infrastructure
  2. Increasing the physical size of antennas
  3. Replacing radio spectrum with fiber
  4. Eliminating all network software

Answer: A) Running network functions as software on virtualized or cloud infrastructure

Explanation:

Virtualization allows network functions to be implemented in software on common computing infrastructure, supporting flexible deployment, scaling, and automation.

48. A factory needs a private wireless network for robots, cameras, sensors, and industrial controllers. Which 5G capability is most directly relevant?

  1. Non-Public Network with appropriate QoS and local services
  2. Public DNS only
  3. Consumer SMS only
  4. Satellite television broadcasting

Answer: A) Non-Public Network with appropriate QoS and local services

Explanation:

5G Non-Public Networks can provide controlled connectivity for enterprise environments. Industrial deployments can combine NPN capabilities with suitable QoS, edge computing, and automation features.

49. A 5G application requires video traffic and industrial control traffic to share the same physical infrastructure but receive different latency and priority treatment. Which combination is most appropriate?

  1. QoS flows with appropriate QoS characteristics, potentially combined with network slicing
  2. One identical QoS treatment for all traffic
  3. Disable packet classification
  4. Route all traffic through the same fixed application port without QoS

Answer: A) QoS flows with appropriate QoS characteristics, potentially combined with network slicing

Explanation:

5G can differentiate traffic through QoS flows, while network slicing can provide broader logical service differentiation when required. This allows different applications to receive network behavior appropriate to their requirements.

50. A 5G operator wants to provide an ultra-low-latency industrial service while keeping ordinary consumer broadband traffic on the same underlying infrastructure. Which architecture most directly supports this requirement?

  1. A dedicated network slice with suitable QoS, traffic steering, and potentially edge computing
  2. A single best-effort queue for all traffic
  3. Disabling the 5G Core
  4. Using only a higher smartphone screen refresh rate

Answer: A) A dedicated network slice with suitable QoS, traffic steering, and potentially edge computing

Explanation:

5G network slicing can provide a logically differentiated service while sharing underlying infrastructure. Appropriate QoS and traffic handling can support the required service characteristics, while edge computing can place application processing closer to the industrial site. 3GPP identifies network slicing and edge computing as important parts of the 5G system architecture.

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