Free Practice Questions for the Huawei HCIP 5G H35-651 Exam (2026 Updated)

Exact Extract — Security Architecture

“The core network is responsible for: Providing user connections; Mobility management and session management; User authentication; Charging management; Providing interfaces for connecting to external networks.”

— Huawei Training Material, Position and Main Functions of the Core Network, page 88.

Technical Deep Dive

The correct command is ADD KI , which provisions authentication-key information associated with a subscriber. 5G Authentication and Key Agreement (5G-AKA) provides mutual authentication between the UE and the serving network through coordinated interactions involving the AUSF, UDM/ARPF, AMF/SEAF, and subscriber USIM.

The long-term subscriber authentication key, commonly denoted K, forms the cryptographic foundation of the authentication process. Associated parameters can include the authentication algorithm, operator configuration, and sequence-number information.

A representative Huawei subscriber authentication-key command uses the following structure:

ADD KI: IMSI="001010123456789", CARDTYPE=USIM, ALG=MILENAGE, ...;

The omitted fields contain sensitive authentication-key parameters and depend on the product release and security configuration. Authentication keys should never be exposed in operational logs or training examples.

The command distinctions are: ADD SUB creates subscriber identity information; ADD AMDATA provisions access and mobility subscription data; MOD AMDATA modifies existing access and mobility subscription data; and ADD KI provisions subscriber authentication-key information.

Huawei's UDM MML command reference defines ADD KI as the command for adding or modifying an individual subscriber authentication key, including algorithm-related parameters. Authentication data is subsequently used by the UDM/ARPF to support 5G-AKA vector generation, with the resulting authentication information exchanged through the standardized authentication services. Therefore, D is correct.

Exact Extract

“Full-stack cloudification and services: Full-stack cloudification (NFVI and VNF) enables quick resource orchestration, and full-stack services (AMF, SMF, UPF, PCF, UDM and IMS) enable quick function orchestration.”

— Huawei 5G Training Material, 5G Core Network Architecture, page 98.

Technical Deep Dive

In a Huawei NFV environment, the successful deployment of management and application components depends on the availability of the underlying virtualization infrastructure and lifecycle management system.

FusionSphere OpenStack provides virtualized compute, storage, and networking resources, while VNF Lifecycle Management (VNF LCM) coordinates the instantiation and lifecycle operations of virtualized network functions.

Before performing the installation described in the question, engineers must verify that these dependencies are operational. Important checks include ensuring that the cloud management services are accessible, the relevant resource pools have sufficient capacity, VNF LCM can communicate with the Virtualized Infrastructure Manager (VIM), and the required deployment images and packages are available.

If FusionSphere OpenStack is unavailable, the deployment workflow may be unable to allocate virtual machines or virtual network resources. If VNF LCM is unavailable, the deployment process cannot reliably coordinate the lifecycle operations required by the installation workflow.

Huawei's NFV deployment procedures use prerequisite checks covering VIM connectivity, VNF lifecycle management, available resources, and platform health. Therefore, verifying these components before installation is a necessary operational practice.

The statement is TRUE.

Exact Extract

“Modularized network functions facilitate function decoupling and integration. Decoupled network functions are abstracted as network services, which can be independently expanded, evolved, and deployed on demand.”

— Huawei 5G Training Material, SBA Network Architecture, page 93.

Technical Deep Dive

The intended Huawei UNC command is ADD SUBCONDITION . The Network Repository Function supports NF registration, discovery, and status subscription services. A network function can subscribe to notifications concerning other NF instances that meet specified criteria.

For example, an SMF may need to track the availability of a particular type of PCF instance. Rather than repeatedly polling the NRF, the subscribing NF can establish a notification subscription with selection criteria. These criteria may include NF type, NF instance identifier, service information, or other supported profile attributes.

ADD SUBCONDITION defines the subscription conditions used to identify target NFs. When a registered NF matching the configured conditions changes its operational status or registration information, the NRF can issue a notification to the relevant subscriber.

This mechanism improves service discovery efficiency and helps control-plane functions react to changes in network function availability.

ADD NFPROFILE concerns NF profile configuration rather than the specific subscription condition. ADD NRF relates to NRF configuration. ADD NRFPARA relates to NRF parameters.

3GPP TS 29.510 defines the NRF NF status subscription service and associated subscription conditions. In Huawei deployments, this configuration must be consistent with the subscribing NF's notification endpoint and permitted NF selection criteria. Therefore, A is correct.

Exact Extract — Service-Based Architecture

“All network functions on the control plane interact with each other through service-based interfaces. A service can be invoked by multiple network functions, reducing the coupling degree defined for interfaces between network functions.”

— Huawei Training Material, SBA Network Architecture, page 93.

Technical Deep Dive

During initial 5G registration, the AMF obtains subscriber information from the UDM using the Nudm_SDM_Get service operation. The retrieved information may include Access and Mobility Subscription Data (AM data) and subscription information relevant to SMF selection.

The relevant service resources include:

/nudm-sdm/v2/{supi}/am-data

/nudm-sdm/v2/{supi}/smf-select-data

The exact API version and URI structure depend on the applicable 3GPP release. If the UDM has no subscription data for the subscriber, it cannot return the requested records. The request may therefore fail with an HTTP error response instead of the expected subscription data.

Option D is the most complete explanation because the question indicates that more than one category of subscriber data is missing. Option A could independently explain failure of the AM-data retrieval operation. However, the absence of AM subscription data alone does not necessarily establish that SMF selection data is also missing.

Option B is not a reason for both data resources to be unavailable. Option C concerns NRF-based NF discovery. If the NRF cannot identify a suitable UDM, the AMF may fail before successfully communicating with the intended UDM, rather than receiving the specified UDM data-retrieval response.

Operational troubleshooting should examine the SUPI, HTTP status, error cause, provisioned subscription records, and UDM service logs. The wording omits the actual HTTP error code. Both A and D can represent valid failure conditions for particular subscription-data requests, but D best matches the combined absence described in the scenario.

Exact Extract — Relevant Architecture

“The control and data planes of the 5GC are completely separated. NFV increases the flexibility of network deployment, enabling distributed edge computing deployment.”

— Huawei 5G Training Material, 5G Network Architecture.

Technical Deep Dive

The correct command is ADD INTERFACE . Huawei UDG supports logical network interfaces used for service connectivity, IP routing, tunnelling, and network management. A logical interface is not necessarily tied to a dedicated physical Ethernet port. For example, a loopback interface is a software-defined interface that can maintain a stable logical identity independently of the operational state of a particular physical network port.

In Huawei's 5GC session-management configuration procedures, the command is used to create a loopback interface:

ADD INTERFACE: IFNAME="LoopBack0", IFADMINSTATUS=up;

Associated commands can include ADD VPNINST , ADD VPNINSTAF , ADD IPBINDVPN , and ADD IFIPV4ADDRESS . These commands handle different configuration layers. ADD VPNINST creates a VPN instance for routing separation, whereas ADD INTERFACE creates the interface itself.

After the logical interface is created, it can be associated with an appropriate VPN instance and assigned an IP address. Huawei's documented UDG configuration procedure demonstrates ADD INTERFACE for loopback-interface creation.

The alternative ADD LOGICINF is not the documented command in that procedure. Therefore, C is correct.

Exact Extract

“Session management; UE IP address allocation; User-plane function selection and control; UPF service control; QoS and policy execution; Downlink data arrival notification.”

— Huawei Training Material, Main Network Functions of the 5GC, SMF section, page 95.

Technical Deep Dive

A UE initiates PDU session establishment by sending a PDU SESSION ESTABLISHMENT REQUEST NAS message, encapsulated within an N1 Session Management container. The accompanying Request Type information identifies the purpose of the session establishment procedure.

A. Initial Request: This value is used when the UE requests establishment of a new, non-emergency PDU session.

B. Emergency Request: This value identifies an establishment request for emergency services. In the standardized Nsmf API, the corresponding value is INITIAL_EMERGENCY_REQUEST .

D. Existing PDU Session: This identifies a request associated with an existing PDU session, such as a session being transferred between 3GPP and non-3GPP access or a session being handed over from an EPC PDN connection.

Option C, Normal Request, is not a standardized 5G PDU Session Request Type value. The standardized request-type values include INITIAL_REQUEST , EXISTING_PDU_SESSION , INITIAL_EMERGENCY_REQUEST , and EXISTING_EMERGENCY_PDU_SESSION .

These are defined in 3GPP TS 29.502 and correspond to the request types described in TS 23.502. The question uses the word messages, although the choices actually identify request types. For ordinary establishment of a new non-emergency session, Initial Request is the applicable value. Across the permitted PDU session establishment procedures, A, B, and D are valid.

Exact Extract — 5G Core Architecture

“The control and data planes of the 5GC are completely separated. NFV increases the flexibility of network deployment, enabling distributed edge computing deployment.”

— Huawei 5G Training Material, 5G Core Network and Edge Computing.

Technical Deep Dive

Huawei UDG 21.0 supports local UE IP address allocation through its User Plane Function (UPF) capabilities. In a conventional 5G architecture, the Session Management Function (SMF) controls PDU sessions and manages IP address allocation decisions. However, the actual assignment of the UE IP address can be performed by the SMF or delegated to the UPF.

When UPF-based address assignment is enabled, an IP address pool is configured on the UDG. During PDU session establishment, the SMF communicates with the UPF using the N4 interface and Packet Forwarding Control Protocol (PFCP). The UPF selects an available address from its local pool and returns the assignment information to the SMF through the PFCP session establishment procedure.

This arrangement is particularly effective in architectures containing multiple SMFs and UPFs. It provides localized address management, better address pool utilization, and simplified capacity expansion.

Typical configuration elements include ADD VPNINST to create a VPN instance for address and routing isolation, ADD POOL to create a local IP address pool, ADD SECTION to add an address range to the pool, ADD POOLGROUP to create an address pool group, and ADD POOLBINDGROUP to associate the local pool with its pool group.

The UPF address allocation functionality and these configuration elements are documented in Huawei's 5GC Session Management training for the 21.1 generation. Therefore, the statement is TRUE.

Exact Extract

“All network functions on the control plane interact with each other through service-based interfaces. A service can be invoked by multiple network functions, reducing the coupling degree defined for interfaces between network functions.”

— Huawei 5G Training Material, SBA Network Architecture, page 93.

Technical Deep Dive

The correct Huawei MML command is DSP HTTPLNK . The Binding Support Function (BSF) provides session binding management for policy-control interactions. In a service-based 5G core architecture, BSF communication with relevant network functions occurs through HTTP-based service interfaces.

Operational monitoring must distinguish between configured peer information and the current communication status. DSP HTTPLNK is used to display HTTP link information and operational status. An engineer can use the command to investigate HTTP connection failures, unexpected peer disconnections, service routing problems, and other SBI communication issues.

The key distinction is between the DSP and LST operations. The DSP operation is used for displaying runtime or status information. The LST operation generally lists configured objects and their associated configuration parameters.

Therefore, LST HTTPLNK may identify configured HTTP links but is not the preferred command when the objective is to check their current operational status. DSP DMLNK relates to Diameter link information rather than HTTP link status. DSP SCPLNK is not the intended BSF HTTP peer-status command.

Engineers should correlate HTTP link status with the remote NF's availability, network reachability, TCP connectivity, TLS configuration where applicable, and service discovery results. Therefore, A is correct.

Exact Extract

“All network functions on the control plane interact with each other through service-based interfaces. A service can be invoked by multiple network functions, reducing the coupling degree defined for interfaces between network functions.”

— Huawei Training Material, SBA Network Architecture, page 93.

Technical Deep Dive

The Binding Support Function (BSF) maintains binding information that allows network functions to locate the appropriate Policy Control Function (PCF) for a subscriber session. The PCF produces and registers the relevant binding information.

The operation is performed using the Nbsf_Management_Register service. A simplified registration procedure is: PCF sends Nbsf_Management_Register to BSF, and BSF returns a Registration Response.

The binding data can include the subscriber's IP address or other session-related identifiers, together with information identifying the responsible PCF. This mechanism is essential in networks containing multiple PCF instances.

For example, when an Application Function requires policy interaction for an existing PDU session, the BSF can help identify the PCF that manages that session.

The AF consumes policy services but does not normally register the PCF's session binding information. The BSF stores and manages binding records but is not the network function that originates the session's PCF binding. The SMF performs session management and exchanges policy information with the PCF, but the PCF registers its binding with the BSF.

3GPP TS 29.521 defines the Nbsf_Management_Register operation initiated by the PCF. Therefore, D is correct.

Exact Extract — Multi-access Edge Computing

“In terms of network construction, edge computing integrates traditional wireless networks with services. Multi-access Edge Computing (MEC) is deployed in the central equipment room of an enterprise or the equipment room of an edge radio base station, which is located in the edge data center (DC). The MEC terminates services by steering and processing traffic locally. It also hosts third party apps to provide tailored and differentiated services to enterprise customers, and agile, smart, tailored service to end users in real time.”

— Huawei Training Material, Multi-access Edge Computing, page 26.

Technical Deep Dive

Multi-access Edge Computing distributes application processing and computing resources closer to network users. The primary objective is to reduce the distance travelled by user traffic and improve the responsiveness of latency-sensitive applications.

A and B — Edge proximity: MEC platforms are deployed at edge locations such as enterprise data centres, metropolitan aggregation facilities, or other sites close to radio access networks. Hosting applications closer to users reduces the need for all traffic to traverse distant centralized data centres.

C — Improved user experience: Local processing can reduce transport latency, decrease backbone bandwidth consumption, and improve application responsiveness. However, the actual improvement depends on the complete service path, application design, radio conditions, and available computing resources.

D — CUPS-based deployment: Control and User Plane Separation allows the SMF and UPF to be deployed at different locations. The SMF may remain centralized while a UPF is deployed closer to users. The local UPF can steer eligible user traffic toward a nearby MEC application through the N6 interface.

A simplified path is UE → gNodeB → N3 → Edge UPF → N6 → MEC Application .

This architecture supports local traffic breakout, enterprise applications, and low-latency services. All four options describe valid MEC characteristics, although MEC and CUPS are distinct technologies and MEC does not inherently require every deployment to use the same UPF placement model.

Exact Extract — Network Slicing

“Network slicing enables operators to slice a network into multiple virtual networks on the same hardware infrastructure to allocate resources as required and flexibly combine capabilities. This technology enables different requirements of diverse services to be met. When new requirements are raised but the network cannot meet them, operators only need to virtualize a new slice to launch services quickly, without needing to deploy a new network.”

— Huawei Training Material, Differentiated 5G Service Requirements, page 21.

Technical Deep Dive

Network slicing allows an operator to create multiple logical networks over shared physical infrastructure. Each network slice can be designed for a particular service profile, customer group, or operational requirement.

A. On-demand deployment: Network functions and resources can be instantiated or scaled according to service requirements, enabling flexible network deployment.

B. Shared or dedicated NFs: Network slices may use dedicated network function instances, shared instances, or a combination of both. For example, different slices may share an AMF while using separate SMF and UPF instances to satisfy specific service requirements.

D. End-to-end SLA assurance: An end-to-end network slice may coordinate resources across the RAN, transport network, and core network to support particular service-level objectives. These can include throughput, latency, reliability, and isolation requirements.

C. Control and User Plane Separation: CUPS separates the network control-plane functions from user-plane packet processing. In 5G, the SMF controls session management and UPF selection, while the UPF forwards user traffic. CUPS supports flexible placement of these functions and can facilitate network slicing, but it is an architectural principle rather than a defining characteristic of network slicing.

A 5G system can implement CUPS without provisioning multiple logical network slices. Therefore, C is correct.

Exact Extract — AMF Functionality

“The core network is responsible for: Providing user connections; Mobility management and session management; User authentication; Charging management; Providing interfaces for connecting to external networks.”

— Huawei Training Material, Position and Main Functions of the Core Network, page 88.

Technical Deep Dive

5G Mobility Management uses two state-management concepts. Registration Management (RM) describes whether the UE is registered with the network; the principal states are RM-DEREGISTERED and RM-REGISTERED . Connection Management (CM) describes the status of the NAS signalling connection between the UE and AMF; its principal states are CM-IDLE and CM-CONNECTED .

The RM and CM states represent different aspects of UE management. For example, a UE may be RM-REGISTERED while CM-IDLE. This means the subscriber remains registered but does not currently maintain an active NAS signalling connection.

During initial registration, the UE can establish a signalling connection before the registration procedure has completed. Therefore, RM-DEREGISTERED and CM-CONNECTED can temporarily coexist. When the UE receives a successful Registration Accept during initial registration, it enters RM-REGISTERED, consistent with Option C.

Why B is commonly selected in this examination: The intended examination interpretation is that the UE and AMF maintain corresponding CM states during normal, successfully coordinated connection-management procedures.

However, an important technical qualification is necessary. The UE detects release of its access-network signalling connection, whereas the AMF detects release of the corresponding N2 context. These events need not be observed at precisely the same instant. Temporary state discrepancies can therefore arise during failures or asynchronous release procedures.

Consequently, Option B is not universally false when interpreted literally. The examination's intended answer is B, but the question should be flagged as technically ambiguous because a transient inconsistency is possible.

Exact Extract

“Full-stack cloudification and services: Full-stack cloudification (NFVI and VNF) enables quick resource orchestration, and full-stack services (AMF, SMF, UPF, PCF, UDM and IMS) enable quick function orchestration.”

— Huawei 5G Training Material, 5G Core Network Architecture, page 98.

Technical Deep Dive

OpenStack is an open-source cloud infrastructure management platform that provides compute, storage, networking, identity management, and supporting services. Huawei FusionSphere OpenStack uses OpenStack-based technologies to provide virtualized infrastructure resources for telecommunications workloads.

A. Horizon is the OpenStack dashboard, providing a web-based graphical interface for administering cloud resources such as instances, images, networks, projects, and storage volumes.

B. OpenStack is an open-source cloud computing project supported by a broad development ecosystem. Its modular architecture allows infrastructure operators to deploy services according to operational requirements.

C. Ceilometer provides telemetry collection capabilities. It collects resource measurements and events that can be consumed by monitoring, billing, and other cloud management components.

D is incorrect because Swift is OpenStack's Object Storage service, not its Image service. The Image service is Glance, which manages image metadata and image-access functionality. Swift may serve as a storage backend for Glance, but it does not replace Glance's image-management role.

In Huawei NFVI environments, these services contribute to resource provisioning and management, while VNF lifecycle orchestration is handled through the appropriate MANO components. The distinction between image management and object storage is operationally important when diagnosing VM deployment failures, missing images, or storage-backend errors.

Exact Extract

“Termination of uplink NAS signaling; NAS signaling security; AS security control; Signaling node for interoperability in 3GPP systems; Reachability management for UEs in idle mode; UE location area management; UE access authentication.”

— Huawei 5G Training Material, Main Network Functions of the 5GC, AMF section, page 94.

Technical Deep Dive

The correct command is DSP NGAPLINK . The N2 interface connects the 5G Radio Access Network (NG-RAN) to the Access and Mobility Management Function (AMF). NG Application Protocol (NGAP) signalling is transported over SCTP.

The DSP NGAPLINK command displays the operational state of NGAP signalling links and their associated SCTP connection information.

A representative command is DSP NGAPLINK: OUTPUTTYPE=Screen; . The output can include the SCTP association identifier, local and peer IP addresses, port numbers, and link status. The engineer should verify that the link is in the expected connected state.

If the N2 link is unavailable, the gNodeB may be unable to exchange registration, paging, UE context management, and other NGAP messages with the AMF.

The remaining commands have different functions. TST PATH is used for path connectivity testing, particularly in user-plane commissioning scenarios. DSP NGPAGING displays NG paging table information rather than the operational NGAP link status. DSP NGPAGINGTABLE is not the documented command for this operation.

Huawei's 5G Core Basic O & M training explicitly identifies DSP NGAPLINK as the NGAP link-status query command. Therefore, C is correct.

Exact Extract — Service-Based Architecture

“All network functions on the control plane interact with each other through service-based interfaces. A service can be invoked by multiple network functions, reducing the coupling degree defined for interfaces between network functions.”

— Huawei 5G Training Material, SBA Network Architecture, page 93.

Technical Deep Dive

Unified Data Management (UDM) provides subscriber-related data management services for the 5G core. It supports subscriber identity management, authentication subscription information, access and mobility subscription data, and session-management subscription information.

A. N8 — UDM to AMF. N8 is the reference point between the UDM and AMF. It supports operations involving access and mobility subscription information and related UE registration data. For example, the AMF can obtain subscriber information using the Nudm_SDM service.

B. N10 — UDM to SMF. N10 connects the UDM and SMF. It supports retrieval and management of session-related subscriber information, including subscribed DNNs, session types, and other subscription parameters.

N5 connects the Application Function (AF) and Policy Control Function (PCF). It is used for application-related policy control interactions. N12 connects the AMF and Authentication Server Function (AUSF). It is used in authentication procedures. The UDM communicates with the AUSF through the N13 reference point, not N12.

These interface mappings are defined in 3GPP TS 23.501. From an operational perspective, an engineer investigating subscriber registration failures should verify UDM service availability, subscriber provisioning, AMF-to-UDM SBI connectivity, and AUSF-to-UDM authentication signalling.

Therefore, A and B are correct.