Nokia Exam 2026 NRN-522 Dumps Updated Questions UPDATED Aug-2026
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NEW QUESTION # 72
A NOC engineer is preparing to remotely change a cell's duplex mode configuration from FDD to TDD. What critical dependency must be verified before this change can be successfully applied?
- A. That the site has access to a valid timing/synchronization reference (such as GNSS or PTP) required for TDD operation
- B. That the cell has an active SFTP connection to NetAct
- C. That all active alarms on the cell have been acknowledged
- D. That the cell's PLMN ID matches the neighboring cells' PLMN IDs
Answer: A
Explanation:
TDD (Time Division Duplex) operation requires precise time synchronization between cells, because uplink and downlink transmissions share the same frequency but are separated in time according to a coordinated frame structure. If neighboring TDD cells are not tightly synchronized, their uplink and downlink slots can overlap, causing severe cross-interference between cells. Before converting a cell's duplex mode to TDD, it is therefore critical to verify that the site has access to a reliable, accurate timing/synchronization reference - typically GNSS (such as GPS) or a network-based reference distributed via PTP (Precision Time Protocol) - and that the synchronization source is stable and within required accuracy limits. FDD (Frequency Division Duplex), by contrast, uses separate frequencies for uplink and downlink and does not have this same stringent synchronization dependency. SFTP connectivity, PLMN matching, and alarm acknowledgment status, while operationally relevant in general, are not the critical technical dependency specific to a duplex mode change.
NEW QUESTION # 73
An 'Equipment Over-Temperature' alarm is raised at a remote site. Besides checking the cooling system itself, what else should a NOC engineer review related to this alarm?
- A. Whether a cabinet door-open, fan failure, or HVAC/air-conditioning fault alarm is also present, indicating a broader environmental issue
- B. The cell's configured Physical Cell Identity (PCI)
- C. The handover success rate KPI
- D. The NetAct software license expiry date
Answer: A
Explanation:
An 'Equipment Over-Temperature' alarm indicates internal temperature monitoring has detected conditions exceeding safe operating limits, which can lead to performance throttling or automatic protective shutdown of the affected hardware. Beyond inspecting the cooling system itself, a NOC engineer should check whether related environmental alarms are also present at the site, such as a cabinet door-open alarm (which disrupts climate control), a fan failure alarm, or an HVAC/air-conditioning fault alarm for the shelter or cabinet.
These correlated alarms often explain an over-temperature condition by pointing to a broader site environmental issue rather than an isolated equipment defect, helping correctly scope the response (for example, escalating an environmental/facilities issue rather than treating it purely as a RAN equipment fault).
The cell's PCI value, handover success rate, and NetAct license expiry date are entirely unrelated to thermal conditions and would not assist in diagnosing this alarm.
NEW QUESTION # 74
A NOC engineer observes that a 5G cell's average downlink user throughput has dropped significantly, but the cell's PRB utilization remains low and no transport alarms are active. Which root cause is most consistent with these observations?
- A. The cell has been administratively locked by an operator
- B. The cell is severely congested due to a sudden increase in connected users
- C. The backhaul link to the cell site has failed completely
- D. Degraded radio link quality is causing a shift toward lower-order modulation and coding schemes
Answer: D
Explanation:
When PRB utilization is low, the cell is not resource-constrained, which rules out congestion as the cause of reduced throughput. A complete transport failure or an administrative lock would prevent the cell from carrying any traffic at all, which contradicts the scenario where the cell is still active and reporting measurements. The most consistent explanation is degraded radio conditions - for example, increased interference, reduced signal-to-noise ratio (SINR), or coverage issues - which force the scheduler to select lower-order Modulation and Coding Scheme (MCS) values for connected users. Lower MCS values mean each allocated resource block carries fewer bits, directly reducing achievable throughput even though plenty of PRB capacity remains available. Investigating MCS distribution counters and SINR-related measurements alongside checking for nearby interference sources or antenna/feeder issues would be the appropriate next troubleshooting step.
NEW QUESTION # 75
During a Site Acceptance Test (SAT) for a newly commissioned 5G site, what is the NOC team's typical role?
- A. To physically inspect the antenna mounting hardware for structural compliance
- B. To negotiate the commercial contract terms for the site's construction
- C. To install the physical RF cabling between the antenna and the baseband unit
- D. To remotely verify that the site is visible and manageable from centralized OandM systems, that cells come into service correctly, that no unexpected alarms are present, and that initial performance indicators are within expected ranges
Answer: D
Explanation:
During a Site Acceptance Test for a newly commissioned site, the NOC team's role centers on remote verification from the centralized operations perspective, complementing the field team's physical inspection and commissioning activities. This typically includes confirming that the new site and its cells are visible, reachable, and manageable through centralized tools such as NetAct (confirming O and M connectivity is correctly established), verifying that all expected cells come into service without configuration errors, checking that no unexpected or unresolved alarms are present that would indicate an incomplete or faulty installation, and reviewing initial performance indicators (such as successful connection attempts and basic KPI reporting) to confirm the site is functioning as intended before it is accepted into normal operation.
Physical inspections of mounting hardware, cabling installation, and commercial/contractual matters fall outside the NOC's remote operational role and are handled by field engineering, construction, and commercial teams respectively.
NEW QUESTION # 76
What is the Nokia-recommended access control practice for NOC personnel who remotely manage live production AirScale base stations?
- A. Share a single generic administrator account among all engineers
- B. Assign individual accounts with role-based access control (RBAC) following least-privilege principles
- C. Leave default factory administrator passwords unchanged
- D. Disable session logging to improve performance
Answer: B
Explanation:
Because a centralized Operations Center manages thousands of live network elements, strict access control is essential to maintaining network integrity and security. Nokia's operational security model requires each engineer to use an individually assigned account, with role-based access control (RBAC) restricting actions to those required for the user's job function - a configuration engineer might have provisioning rights, while a monitoring-only NOC analyst might have read-only access. This least-privilege approach provides full traceability of who performed which action, supports accountability during root-cause investigations, and limits the impact if any single account is compromised. Sharing a generic administrator account destroys individual accountability and increases risk of untraceable changes. Disabling session logging removes the audit trail needed for troubleshooting and compliance. Leaving default factory passwords unchanged is a well-known security vulnerability that must be remediated during commissioning, not a recommended ongoing practice.
NEW QUESTION # 77
During a remote piloting activity, the NOC engineer and field engineer are unable to bring a replaced RF unit into service despite following standard verification and troubleshooting steps, and a hardware fault on the new unit itself is suspected. What is the most appropriate next step?
- A. Continue indefinitely repeating the same remote troubleshooting steps without involving any other teams
- B. Instruct the field engineer to discard the new unit and leave the site without further communication
- C. Escalate the issue to the next-level support team or vendor technical assistance, providing documented details of the steps already performed, the symptoms observed, and the suspected hardware fault, to support further diagnosis or part replacement
- D. Permanently delete the cell's configuration from NetAct to resolve the issue
Answer: C
Explanation:
When standard remote troubleshooting and on-site verification steps have been exhausted and a hardware fault on the newly installed unit itself is suspected, continuing to repeat the same steps is unlikely to be productive and delays resolution. The appropriate next step is to escalate the issue to the next level of support
- which may be a specialized technical support team or the equipment vendor's technical assistance center - providing clear documentation of what steps have already been performed, the specific symptoms observed (such as particular alarm codes or link status indications), and the basis for suspecting a hardware fault on the new unit. This documentation allows the receiving team to avoid repeating already-completed steps and to focus on deeper diagnosis, which may lead to confirming a defective unit and arranging a further replacement. Leaving the site without resolution or communication abandons the activity in an incomplete state, and deleting the cell's configuration would not address a suspected hardware defect and would create additional, unnecessary recovery work.
NEW QUESTION # 78
Which Nokia centralized network management system is primarily used by NOC and technical support personnel to monitor, configure, and manage AirScale 5G base stations remotely from an Operations Center?
- A. NetAct
- B. Nokia Digital Automation Cloud
- C. CloudBand
- D. NetGuard Security Management
Answer: A
Explanation:
NetAct is Nokia's centralized Operations Support System (OSS) and is the primary platform used by NOC and technical support teams to manage AirScale 5G base stations from a centralized Operations Center. It integrates Fault Management (FM), Configuration Management (CM), Performance Management (PM), and Software Management (SWM) modules into a single environment, allowing engineers to monitor alarms, push configuration changes, review KPI dashboards, and manage software lifecycle activities across the entire RAN estate without visiting individual sites. While element-level tools such as BTS Site Manager exist for local diagnostics on a single base station, NetAct is the day-to-day platform for remote, network-wide operations. NetGuard focuses on security analytics, CloudBand on NFV infrastructure orchestration, and Nokia Digital Automation Cloud targets private wireless deployments, so none of these serve as the primary RAN operations management system referenced in remote operations procedures.
NEW QUESTION # 79
What operational benefit does the Automatic Neighbor Relation (ANR) function provide to a NOC team managing 5G RAN configuration?
- A. It automatically changes the PLMN ID of a cell when roaming agreements change
- B. It automatically detects neighboring cells based on UE measurement reports and establishes or updates neighbor relations without requiring manual configuration of each relation
- C. It automatically increases a cell's transmit power whenever coverage gaps are detected
- D. It automatically resolves all hardware faults on RF units without engineer intervention
Answer: B
Explanation:
The Automatic Neighbor Relation (ANR) function reduces the manual configuration burden associated with maintaining accurate neighbor lists across a large RAN by using UE measurement reports to detect cells that UEs can actually see and successfully measure in the field. When a UE reports a previously unconfigured neighboring cell with sufficient signal quality, ANR can automatically add the appropriate neighbor relation (and, where applicable, retrieve the necessary identification information for that neighbor) so that future handovers toward that cell can be evaluated and executed. This is particularly valuable in dense, frequently changing network environments where manually planning every neighbor relation - especially across vendor or technology boundaries - would be time-consuming and error-prone. ANR does not address hardware faults, PLMN configuration, or transmit power adjustments, which are governed by separate fault management and RF parameter processes respectively, but it significantly improves the completeness and accuracy of neighbor relation databases that mobility KPIs depend on.
NEW QUESTION # 80
What does the term 'Single RAN' refer to in the context of Nokia AirScale base stations?
- A. A common baseband hardware platform that can support 2G, 3G, 4G, and 5G simultaneously via software configuration
- B. A requirement that only one mobile operator can ever use the equipment
- C. A type of SIM card used for testing
- D. A restriction allowing only one antenna per site
Answer: A
Explanation:
Single RAN describes Nokia's architecture in which a common AirScale hardware platform - including the System Module and compatible radio units - can run multiple radio access technologies (2G GSM, 3G WCDMA, 4G LTE, and 5G NR) concurrently on the same site, with the technology mix and capacity determined by software configuration and licensing rather than separate dedicated hardware per generation.
This dramatically simplifies site footprint, power usage, and lifecycle management, and allows 5G to be introduced onto existing sites by adding software/capacity rather than deploying entirely new cabinets. It is unrelated to antenna count limits or SIM card types, and AirScale platforms also support multi-operator RAN sharing, so it does not restrict usage to a single operator. For NOC personnel, Single RAN means configuration, fault, and software management for several technologies may be addressed through the same base station and management session.
NEW QUESTION # 81
Before a field engineer disconnects and removes an RF unit for replacement, what action should the NOC engineer typically perform first?
- A. Increase the transmit power of neighboring cells to compensate for the upcoming outage
- B. Change the cell's PLMN ID to prevent UEs from attempting to connect
- C. Administratively lock the affected cell(s) so the disconnection occurs in a controlled state rather than appearing as an unexpected fault
- D. Permanently delete the cell's configuration from NetAct
Answer: C
Explanation:
Before a field engineer physically disconnects an RF unit, the NOC engineer should administratively lock the affected cell(s). Locking puts the cell into a controlled, planned out-of-service state, which has several benefits: it allows UEs currently served by the cell to be handed over or to reselect to neighboring cells in an orderly manner before the disconnection occurs, and it ensures that when the RF unit is disconnected, the resulting alarms are correctly understood by the NOC and any monitoring systems as part of a planned maintenance activity rather than an unexpected fault requiring separate investigation or triggering unnecessary alerts/escalations. Increasing neighboring cells' power is not a standard or necessary preparatory step and could introduce interference; deleting the configuration would require a full re- commissioning afterward; and changing the PLMN ID would be both ineffective at preventing the brief outage and disruptive to network identification.
NEW QUESTION # 82
NetAct reports the transport link to a remote 5G site as 'up', but the NOC engineer still cannot establish an OandM session to the AirScale BTS. What is the MOST appropriate next troubleshooting step?
- A. Increase the cell's reference signal transmit power
- B. Restart the entire NetAct server
- C. Verify authentication credentials/certificates and the OandM IP/VLAN configuration on the base station
- D. Immediately dispatch a technician to replace the RF module
Answer: C
Explanation:
When basic transport/IP connectivity to a site is confirmed as up but an O and M management session still cannot be established, the issue is likely at a higher layer than physical or network-layer reachability.
Common causes include expired or mismatched security certificates, incorrect login credentials, or a misconfigured O and M IP address or management VLAN on the base station itself. A layered troubleshooting approach moves from transport, to network, to application/management-layer checks once lower layers are confirmed functional. Replacing the RF module addresses a hardware radio issue, not an O and M session
/authentication problem, and would be premature without further evidence. Adjusting reference signal power is unrelated to management connectivity. Restarting the entire NetAct server is a drastic action affecting the whole managed network and is never an appropriate first response to a single-site connectivity issue.
NEW QUESTION # 83
After a remote piloting session for a hardware replacement is successfully completed and the site is confirmed to be back in normal operation, what should the NOC engineer do regarding the activity record?
- A. Forward the field engineer's personal mobile number to all other NOC team members
- B. Delete the maintenance ticket immediately, since the issue has been resolved
- C. Take no further action, since verbal confirmation with the field engineer is sufficient and no written record is needed
- D. Document the activity, including the actions taken, verification results, and final status, in the appropriate maintenance ticket or change record
Answer: D
Explanation:
After successfully completing a remote piloting session, documenting the activity in the appropriate maintenance ticket or change record is an essential closing step. This documentation should capture what actions were taken (both remotely and physically), the verification steps performed and their results (such as confirmation that the cell returned to service without alarms and that links were re-established), and the final status of the site. This record provides traceability for future reference - for example, if related issues arise later, or for audit and reporting purposes - and ensures continuity for other team members who may not have been involved in the original activity but need context later. Relying solely on verbal confirmation provides no lasting record and is inconsistent with good operational practice. Deleting the ticket immediately discards this valuable history, and sharing a field engineer's personal contact information with the broader team is unrelated to activity documentation and would raise privacy considerations.
NEW QUESTION # 84
Before activating a newly downloaded software package on a base station, why is it important to verify software compatibility with the unit's current hardware and configuration?
- A. Because software compatibility checks are only relevant for 2G equipment and do not apply to 5G base stations
- B. Because activating an incompatible software package can result in activation failure, degraded functionality, or the unit failing to return to normal operation, even if the automatic fallback eventually recovers it
- C. Because compatibility checks automatically update the site's physical inventory records
- D. Because compatibility verification eliminates the need for any post-activation monitoring
Answer: B
Explanation:
Verifying that a software package is compatible with a base station's specific hardware variants, installed modules, and current configuration before activation helps avoid activation failures or operational issues that can arise when a software load does not properly support the hardware it is being applied to, or when configuration elements are incompatible with structural changes introduced in the new software. While an automatic fallback mechanism may eventually recover the unit to its previous working state if activation fails, relying on fallback as the primary safeguard introduces avoidable service disruption and consumes a maintenance window without achieving the intended upgrade. Compatibility considerations are relevant across all supported technologies within Nokia's Single RAN portfolio, not just legacy systems, and compatibility checks are a software lifecycle planning activity - they do not update physical inventory records or remove the need for post-activation health monitoring, which remains essential regardless of how thorough the pre-activation checks were.
NEW QUESTION # 85
What is the primary purpose of the Xn interface in a 5G RAN architecture?
- A. It is used exclusively for software downloads from NetAct to the base station
- B. It provides direct communication between gNBs to support functions such as handover signaling and data forwarding during mobility
- C. It connects the RF unit to the baseband unit within a single base station
- D. It connects the gNB to the core network for user authentication only
Answer: B
Explanation:
The Xn interface is the logical interface that connects neighboring gNBs (5G base stations) directly to one another, serving a role analogous to the X2 interface in 4G LTE. Its primary purpose is to support mobility- related signaling and data exchange between gNBs - most notably during handover procedures, where the source and target gNB use the Xn interface to coordinate the handover, exchange context information about the UE, and forward any buffered downlink user-plane data to minimize service interruption during the transition. The Xn interface can also carry information used for interference management and load balancing between neighboring cells. It is distinct from interfaces connecting the gNB to the core network (such as the NG interface), from intra-base-station interfaces like CPRI/eCPRI connecting baseband and RF units, and from the O and M connectivity used for software management, each of which serves a different architectural function within the overall RAN system.
NEW QUESTION # 86
Which alarm severity level generally requires the MOST urgent NOC response under standard SLA-based prioritization?
- A. Critical
- B. Minor
- C. Warning
- D. Major
Answer: A
Explanation:
In the standard alarm severity model used across telecom Fault Management systems, including NetAct, Critical alarms represent the highest severity, typically indicating a total or near-total loss of service, capability, or capacity with immediate and significant impact on subscribers - for example, a complete cell or site outage. Because of this severe impact, Critical alarms require the most urgent NOC response and are governed by the tightest response and resolution timeframes among all severity levels in most operational SLAs. Major alarms indicate serious degradation requiring prompt, though slightly less immediate, action.
Minor alarms represent non-service-affecting issues that should be addressed to prevent escalation, and Warning alarms are typically informational or preventive, requiring the least urgency. Correctly prioritizing Critical alarms above all others ensures NOC resources focus first on the issues with the greatest impact on network availability and customer experience.
NEW QUESTION # 87
While remotely piloting an RF unit replacement, the NOC engineer notices the new unit is detected but the cell fails to come into service, with an alarm indicating a CPRI/eCPRI configuration mismatch. What is a likely cause that the NOC and field engineer should jointly investigate?
- A. The field engineer used a different brand of cable ties than specified
- B. The cell's PLMN ID was automatically changed during the replacement
- C. The replacement RF unit is connected to a different physical port than the original unit, resulting in a mapping that does not match the existing configuration
- D. The replacement RF unit's exterior paint color does not match the original
Answer: C
Explanation:
A CPRI/eCPRI configuration mismatch alarm following a hardware replacement often indicates that the physical connection topology does not align with what the system's configuration expects - commonly because the replacement RF unit was connected to a different physical port on the baseband module than the original unit occupied. Since configuration data often references specific port mappings to associate logical cell configurations with specific physical RF unit connections, a port mismatch can prevent the system from correctly associating the detected hardware with the expected configuration, resulting in the cell failing to come into service despite the link being physically established. The NOC engineer should work with the field engineer to confirm exactly which physical port the new unit is connected to and compare this against the expected port mapping in the configuration, correcting either the physical connection or the configuration as appropriate. Cosmetic details such as cable ties or paint color, and unrelated identifiers like PLMN ID, have no bearing on this type of technical mismatch.
NEW QUESTION # 88
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