[Q68-Q92] Try NRN-522 Free Now! Real Exam Question Answers Updated [Jul 29, 2026]

Try NRN-522 Free Now! Real Exam Question Answers Updated [Jul 29, 2026]

Get Ready to Pass the NRN-522 exam with Nokia Latest Practice Exam 

Nokia NRN-522 certification exam is designed to cover a wide range of topics related to 5G RAN network operations. Candidates will be tested on their knowledge of the 5G radio access network architecture, including the different nodes and interfaces that make up the network. They will also be tested on their ability to plan and optimize the network to ensure maximum performance and efficiency. In addition, candidates will be tested on their ability to troubleshoot and resolve network issues in a timely and effective manner.

Nokia NRN-522 Exam is a comprehensive test that covers a wide range of topics related to 5G network operations. NRN-522 exam is designed to assess the candidate's ability to manage, operate, and optimize 5G networks. NRN-522 exam also covers topics such as network performance management, fault management, and configuration management. Passing NRN-522 exam validates that the candidate has the necessary knowledge and skills to effectively manage and operate a 5G RAN network. Nokia 5G RAN Network Operations Expert certification is highly respected in the industry and is considered a valuable asset for professionals who want to advance their careers in the field of 5G network operations.

 

NEW QUESTION # 68
A NOC engineer needs to open an interactive command-line session directly to an AirScale BTS for advanced diagnostics. Which protocol should be used to comply with Nokia's secure remote access guidelines?

• A. SNMPv1
• B. Telnet
• C. SSH
• D. HTTP

Answer: C

Explanation:
SSH (Secure Shell) is the protocol mandated for interactive command-line access to AirScale base stations because it encrypts the entire session, including login credentials, commands, and output, protecting it from interception as it traverses the wide-area transport network between the Operations Center and the remote site. Telnet transmits all data, including usernames and passwords, in plain text and is explicitly disallowed on production network elements due to the severe security risk. HTTP may be used for some web-based management interfaces but is not the standard for direct CLI diagnostic sessions, and plain HTTP itself is also insecure unless using HTTPS. SNMPv1 is an older management protocol used for polling status and traps, lacks strong authentication and encryption, and is not used for interactive shell sessions. Nokia's hardening guidelines for remote operations require encrypted management protocols such as SSH for all direct element access.

NEW QUESTION # 69
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 cell has an active SFTP connection to NetAct
• B. That all active alarms on the cell have been acknowledged
• C. That the cell's PLMN ID matches the neighboring cells' PLMN IDs
• D. That the site has access to a valid timing/synchronization reference (such as GNSS or PTP) required for TDD operation

Answer: D

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 # 70
After exhausting standard remote troubleshooting steps for a persistent Major alarm that remains unresolved, what is the appropriate NOC action?

• A. Ignore the alarm and wait to see if it clears on its own
• B. Escalate the issue following defined procedures (e.g., to a higher support tier or field operations), documenting troubleshooting steps already performed
• C. Administratively lock all cells across the entire network
• D. Delete the alarm record from NetAct so it no longer appears

Answer: B

Explanation:
When standard remote troubleshooting steps for a persistent Major alarm have been exhausted without resolution, the appropriate NOC action is to follow the organization's defined escalation procedures - this may involve escalating to a higher-tier technical support team, a specialist engineering group, or field operations for a possible site visit, depending on the nature of the fault. Critically, the engineer should document the troubleshooting steps already performed, observations made, and relevant data gathered (alarm history, performance data, configuration checks), so the receiving team can proceed efficiently without repeating completed work. Ignoring the alarm leaves a genuine network issue unaddressed and risks breaching service level agreements. Deleting the alarm from NetAct does not resolve the underlying fault and removes valuable diagnostic history. Locking all cells across the entire network is a drastic, disproportionate action that would itself cause a massive outage and is never an appropriate response to a single persistent alarm.

NEW QUESTION # 71
How do NetAct and the AirScale BTS local Element Manager (Site Manager) typically relate to each other in day-to-day remote operations?

• A. The Element Manager centrally manages multiple base station sites across the network
• B. NetAct manages only 2G/3G technologies, while the Element Manager manages only 5G
• C. NetAct eliminates any need for local element-level management tools
• D. NetAct provides centralized, network-wide OAM, while the Element Manager provides detailed, element-specific local access for in-depth diagnostics

Answer: D

Explanation:
NetAct provides a consolidated, network-wide view of alarms, performance, configuration, and software status for all managed base stations, enabling efficient centralized operations at scale - this is the day-to-day tool for NOC monitoring and bulk provisioning. The BTS Site Manager (Element Manager) complements NetAct by providing detailed, element-specific access for situations requiring deep local diagnostics, such as reviewing local hardware status, logs, or actions not yet reflected centrally, or when central connectivity to a site is degraded. These two tools work together rather than as substitutes for one another. NetAct supports Nokia's Single RAN concept across 2G, 3G, 4G, and 5G technologies on shared hardware, so describing it as
2G/3G-only is incorrect, and the Element Manager is scoped to a single element rather than managing multiple sites network-wide, which is NetAct's role.

NEW QUESTION # 72
Which alarm severity level generally requires the MOST urgent NOC response under standard SLA-based prioritization?

• A. Major
• B. Minor
• C. Critical
• D. Warning

Answer: C

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 # 73
When planning the channel bandwidth and subcarrier spacing for a 5G cell, what is the primary operational impact of these parameters?

• A. They determine the encryption algorithm used for OandM traffic to the cell
• B. They determine which alarm severities are enabled for the cell
• C. They determine the cell's PLMN ID and Tracking Area Code
• D. They determine the number of available Physical Resource Blocks (PRBs), which directly affects the cell's total capacity for scheduling user traffic

Answer: D

Explanation:
Channel bandwidth and subcarrier spacing are fundamental radio configuration parameters that together determine how many Physical Resource Blocks (PRBs) are available within a cell's carrier. Since PRBs are the basic units of radio resource that the scheduler allocates to UEs for both downlink and uplink transmissions, the number of available PRBs directly determines the cell's theoretical capacity - that is, how much traffic the cell can serve simultaneously before becoming congested. A wider channel bandwidth provides more PRBs and therefore greater capacity, while subcarrier spacing affects the size of each PRB in the frequency domain and has implications for latency and mobility performance at different frequency ranges. These parameters are foundational to capacity planning and must be configured consistently with the operator's spectrum holdings and regulatory allocations. They have no bearing on PLMN/TAC identifiers, alarm severity configuration, or O and M transport security, which are governed by entirely separate configuration domains.

NEW QUESTION # 74
After a field engineer physically replaces a Remote Electrical Tilt (RET) antenna actuator, what remote verification should the NOC engineer perform to confirm the new unit is properly integrated?

• A. Confirm the RET unit has the same serial number as the unit it replaced
• B. Confirm the new RET device is detected and communicating correctly over the AISG bus, and verify that its tilt position can be read and adjusted as expected
• C. Confirm the RET unit's color matches the previous unit
• D. Confirm the RET unit is broadcasting on the correct NR-ARFCN

Answer: B

Explanation:
Remote Electrical Tilt (RET) units are Antenna Line Devices (ALDs) that communicate with the base station over the Antenna Interface Standards Group (AISG) bus. After a physical RET replacement, the appropriate remote verification is to confirm that the new device is discovered on the AISG bus, that it is communicating correctly with the base station's controller, and that its current tilt position can be read remotely and that tilt adjustment commands are correctly applied and reflected back. This confirms both the physical connectivity (cabling/bus communication) and functional operability (motor and position feedback) of the replaced unit.
The unit's color is irrelevant to functional verification, and while serial number changes are expected with replacement (a new unit will naturally have a different serial number, which should simply be recorded for inventory purposes), it is not itself a functional check. NR-ARFCN relates to radio carrier frequency configuration and has no relationship to RET device verification.

NEW QUESTION # 75
Which NetAct Fault Management view should a NOC engineer use to see alarms that are currently outstanding and affecting the network, as opposed to alarms that have already been resolved?

• A. Active Alarms list
• B. PM Reports
• C. Software Inventory view
• D. Alarm History/Log

Answer: A

Explanation:
The Active Alarms list in NetAct Fault Management displays alarms that are currently outstanding (uncleared) and affecting the network in real time, making it the primary view NOC engineers monitor to identify ongoing issues requiring attention and to prioritize response based on severity. The Alarm History
/Log, in contrast, contains records of past alarms - including those already cleared - which is useful for trend analysis, post-incident reviews, and identifying recurring or intermittent faults over time, but is not the appropriate view for real-time triage of current network health. PM Reports relate to performance counters and KPI trends, not fault/alarm conditions, and the Software Inventory view shows deployed software versions across elements rather than fault information. For day-to-day monitoring and prioritizing immediate response efforts, the Active Alarms list is the correct view.

NEW QUESTION # 76
During a Site Acceptance Test (SAT) for a newly commissioned 5G site, what is the NOC team's typical role?

• A. 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
• B. To physically inspect the antenna mounting hardware for structural compliance
• C. To install the physical RF cabling between the antenna and the baseband unit
• D. To negotiate the commercial contract terms for the site's construction

Answer: A

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 # 77
Which KPI category does the RRC Connection Setup Success Rate primarily belong to, and what does a sustained drop in this KPI typically indicate?

• A. Mobility - indicates handovers between cells are failing
• B. Accessibility - indicates UEs are having difficulty establishing an initial RRC connection to the cell
• C. Availability - indicates the cell has gone out of service
• D. Integrity - indicates poor user-plane throughput

Answer: B

Explanation:
The RRC Connection Setup Success Rate is one of the primary Accessibility KPIs, measuring how reliably User Equipment (UE) can successfully establish a Radio Resource Control connection with the network when attempting to access services. A sustained decline in this KPI indicates that a meaningful proportion of connection attempts are failing before the UE even reaches an active signaling state, which directly impacts a subscriber's ability to begin a session. Common causes include radio interference, congestion-related admission control rejections, configuration errors affecting random access or initial signaling parameters, or hardware faults on the baseband or RF units. This differs from Mobility KPIs (which assess handover performance for already-connected UEs), Integrity KPIs (which assess throughput and quality during an active session), and Availability KPIs (which assess whether the cell itself is in service). Accessibility issues should be prioritized since they affect every subscriber attempting to use the cell.

NEW QUESTION # 78
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. Immediately dispatch a technician to replace the RF module
• B. Restart the entire NetAct server
• C. Increase the cell's reference signal transmit power
• D. Verify authentication credentials/certificates and the OandM IP/VLAN configuration on the base station

Answer: D

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 # 79
A NOC engineer is considering performing a remote factory reset on a base station as a troubleshooting step for a persistent issue. What is the most significant risk of this action if performed without proper preparation?

• A. A factory reset only affects the unit's physical LED indicators and has no impact on service
• B. A factory reset may erase the unit's current configuration, requiring a full restoration from backup (or re- commissioning) to return the site to its operational state
• C. A factory reset automatically creates a new backup of the current configuration before proceeding
• D. A factory reset has no effect on the unit's configuration and is therefore always safe to perform

Answer: B

Explanation:
A factory reset typically returns a network element to its default, out-of-the-box configuration state, which generally means erasing the unit's current operational configuration - including cell parameters, neighbor relations, and other site-specific provisioning. If performed without first ensuring a verified, complete configuration backup is available, this action can leave the site without the configuration needed to resume normal operation, requiring a time-consuming restoration from backup or, in the worst case, a full re- commissioning process involving significant manual effort. Given this risk, a factory reset is generally considered a last-resort troubleshooting action, used only when less drastic remote troubleshooting steps have been exhausted, and only after confirming that a usable backup exists and that the operational impact (likely requiring an extended outage for the affected cells) is acceptable and properly scheduled. The action does not automatically create its own backup, nor is its impact limited to cosmetic indicators - it directly affects the unit's operational state.

NEW QUESTION # 80
After a field engineer replaces an RF unit, the NOC engineer observes that the eCPRI link between the baseband and the new RF unit remains down, even after the cell is unlocked. What should the NOC engineer do first?

• A. Immediately order a replacement baseband module to be shipped to the site
• B. Change the cell's PLMN ID to force the eCPRI link to re-establish
• C. Permanently lock the cell and close the maintenance ticket as complete
• D. Ask the field engineer to verify the physical fiber connections and SFP transceivers between the baseband and the new RF unit before pursuing further remote diagnosis

Answer: D

Explanation:
When an eCPRI (or CPRI) link remains down immediately following a physical hardware replacement, the most probable and easily verified cause is a physical-layer issue introduced during the replacement itself - such as a fiber connector not being fully seated, an SFP transceiver not properly inserted, a mismatched or faulty SFP module, or an incorrect port connection. Since the field engineer is already on site with direct physical access, the most efficient first step is to ask them to verify these physical connections before the NOC engineer invests time in deeper remote diagnostics, which would be premature given how common and simple physical connection issues are immediately after hardware work. Ordering a new baseband module is a significant escalation that should only follow ruling out simpler causes; locking the cell and closing the ticket would leave the site non-functional; and PLMN ID has no relationship to eCPRI link establishment, which operates at a lower layer entirely unrelated to network identity broadcasting.

NEW QUESTION # 81
Before rolling out a new software release across an entire region's base stations, an operator first activates it on a small subset of sites and closely monitors their performance for a period of time. What is this practice commonly called, and what is its primary benefit?

• A. A staged or pilot (canary) rollout - its benefit is detecting any issues introduced by the new software on a limited number of sites before wider deployment, limiting the potential impact of unforeseen problems
• B. A factory reset campaign - its benefit is reducing license costs
• C. A bulk parameter update - its benefit is applying neighbor relation changes more quickly
• D. A configuration audit - its benefit is verifying PLMN ID consistency

Answer: A

Explanation:
A staged or pilot rollout - sometimes referred to as a canary deployment - involves activating a new software release on a small, representative subset of sites first, then closely monitoring key indicators such as alarms, KPIs, and overall stability for a defined observation period before proceeding with wider deployment. The primary benefit of this approach is risk containment: if the new software introduces an unforeseen issue - whether a compatibility problem, a performance regression, or an unexpected interaction with certain configurations - the impact is limited to the pilot sites rather than the entire region, allowing the issue to be identified and addressed (potentially by halting further rollout) before it affects a much larger portion of the network. This practice is a software lifecycle risk-management technique and is unrelated to factory resets, configuration audits focused on PLMN consistency, or bulk parameter updates, which serve entirely different operational purposes.

NEW QUESTION # 82
How is the Cell Availability KPI typically calculated for a reporting period, and what does this KPI primarily reflect?

• A. (Total active alarms / total cleared alarms) x 100 - reflects fault management efficiency
• B. (Total time the cell was in service / total time in the period) x 100 - reflects how much of the period the cell was able to carry traffic
• C. (Total successful handovers / total handover attempts) x 100 - reflects mobility performance
• D. (Total downlink throughput / total uplink throughput) x 100 - reflects traffic balance

Answer: B

Explanation:
Cell Availability is an Availability-category KPI that measures the proportion of a given reporting period during which a cell was operationally able to carry traffic - that is, unlocked, in service, and not blocked by a fault. It is calculated as the ratio of the time the cell was actually available to the total duration of the reporting period, expressed as a percentage. Periods of planned maintenance (administrative locking) are sometimes excluded or tracked separately from unplanned outages, depending on operator reporting policy, since the two have different operational implications. This KPI is critical for service level agreement (SLA) reporting and for identifying cells with recurring stability issues such as repeated automatic resets, hardware faults, or transport outages. It is distinct from throughput-based, handover-based, or alarm-count-based ratios, which belong to other KPI categories and answer different operational questions.

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. Take no further action, since verbal confirmation with the field engineer is sufficient and no written record is needed
• B. Forward the field engineer's personal mobile number to all other NOC team members
• C. Delete the maintenance ticket immediately, since the issue has been resolved
• 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
A site reports a 'Rectifier Fault' or 'DC Power Fault' alarm together with multiple equipment alarms across different cabinets. What does the rectifier/DC power fault alarm relate to?

• A. A software licensing issue on the base station
• B. NetAct user account permissions
• C. The configuration of neighboring cells
• D. The site's AC-to-DC power supply system feeding the equipment

Answer: D

Explanation:
A 'Rectifier Fault' or 'DC Power Fault' alarm relates to the site's power infrastructure - specifically the rectifier units that convert incoming AC mains power into the DC voltage used by BTS equipment, often backed by a battery system to ride through short outages. When this alarm appears alongside multiple equipment alarms across different cabinets or modules at the same site, it strongly suggests a shared power supply problem affecting all equipment dependent on that source, rather than independent hardware faults occurring coincidentally across multiple unrelated components. This is unrelated to software licensing, neighbor cell configuration, or NetAct user permissions. Recognizing this pattern helps the NOC engineer correctly identify a power infrastructure issue as the likely root cause, prompting checks on AC mains status, battery backup health, or coordination with site facilities/power maintenance teams, rather than independently chasing each equipment alarm as a separate RAN hardware fault.

NEW QUESTION # 85
Before a field engineer disconnects and removes an RF unit for replacement, what action should the NOC engineer typically perform first?

• A. Permanently delete the cell's configuration from NetAct
• B. Change the cell's PLMN ID to prevent UEs from attempting to connect
• C. Increase the transmit power of neighboring cells to compensate for the upcoming outage
• D. Administratively lock the affected cell(s) so the disconnection occurs in a controlled state rather than appearing as an unexpected fault

Answer: D

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 # 86
Before granting a new NOC engineer remote access credentials to production AirScale sites, what should be verified according to Nokia's operational security practices?

• A. That the engineer holds physical keys to all site cabinets
• B. That the engineer has completed required training and is assigned a role matching their responsibilities under the least-privilege principle
• C. That the engineer's account has unrestricted access to all NetAct modules by default
• D. That the engineer owns a personal mobile phone

Answer: B

Explanation:
Before a new NOC engineer is granted credentials to access live production AirScale sites, operational security practice requires confirming the individual has completed the appropriate training for the tools, procedures, and risks involved, and that their account is provisioned with a role matching their actual job responsibilities, following the least-privilege principle of granting only the access necessary to perform assigned tasks. This minimizes the risk of accidental or unauthorized actions on a live network by inexperienced or over-privileged users. Owning a personal mobile phone or holding physical site keys relate to unrelated personal or facility-access matters and have no bearing on logical access provisioning for remote OAM systems. Granting unrestricted access to all NetAct modules by default directly contradicts least- privilege principles, increases organizational risk, and is explicitly the kind of practice operational security guidelines aim to prevent.

NEW QUESTION # 87
Why is it considered a best practice to verify the integrity of a configuration or software backup file shortly after it is created, rather than assuming the backup process completed successfully?

• A. Because backup verification automatically improves the cell's KPI performance
• B. Because verification is required by NetAct before any alarms can be displayed for the element
• C. Because unverified backups cause the base station to continuously restart
• D. Because a backup that appears to have completed without verification could be incomplete or corrupted, and this would only be discovered when it is needed for a restore - at which point recovery options become severely limited

Answer: D

Explanation:
A backup operation reporting a successful completion status does not always guarantee that the resulting backup file is complete, uncorrupted, and usable for a future restore - issues such as interrupted transfers, storage errors, or partial writes can sometimes occur without being immediately obvious. The critical risk is that such problems are often only discovered at the moment a restore is actually needed - typically during a recovery from a failed upgrade or configuration change - at which point the absence of a usable backup severely limits recovery options and can significantly extend an outage. For this reason, verifying backup integrity (for example, through checksum validation, file size checks, or test restores where feasible) shortly after creation is considered a best practice, ensuring that if a restore is ever needed, the backup can be relied upon. Backup verification has no relationship to KPI performance, alarm display functionality, or causing repeated restarts - its sole purpose is to confirm the backup's usability for recovery.

NEW QUESTION # 88
A NOC engineer is investigating subscriber complaints of being unable to access data services even though their devices show a strong 5G signal and successfully camp on the cell. Which KPI should the engineer examine first to determine whether the issue lies in establishing the data bearer itself?

• A. Reference Signal Received Power (RSRP) distribution
• B. Cell Availability
• C. PDU Session / E-RAB Setup Success Rate
• D. Handover Success Rate

Answer: C

Explanation:
If a device successfully camps on a cell and shows strong signal levels but cannot access data services, the issue most likely lies beyond the initial radio connection - specifically in establishing the data bearer (PDU session in 5G, analogous to E-RAB in 4G) required to carry user-plane traffic to the core network. The PDU Session/E-RAB Setup Success Rate KPI directly measures how often these bearer establishment procedures succeed, and a low value points to problems such as core network signaling failures, transport issues toward the user-plane gateway, configuration mismatches, or resource allocation failures at the RAN. Cell Availability simply confirms the cell is operational, Handover Success Rate is only relevant once a session is active and mobility occurs, and strong RSRP only confirms good radio coverage - none of these directly explain a failure to establish the data session itself, making the PDU Session/E-RAB Setup Success Rate the correct first KPI to examine.

NEW QUESTION # 89
What is the function of cell reselection priority parameters configured for idle-mode UEs across different frequency layers (e.g., 5G vs. 4G, or different 5G bands)?

• A. They determine the encryption keys used for signaling on each frequency layer
• B. They guide idle-mode UEs toward preferred frequency layers or cells, influencing which layer a UE camps on when multiple suitable options are available
• C. They determine which UEs are allowed to register on the network at all
• D. They define the maximum transmit power for each frequency layer

Answer: B

Explanation:
Cell reselection priority parameters are broadcast to idle-mode UEs and inform them how to prioritize different frequency layers (such as a 5G band versus an LTE band, or multiple 5G bands) when more than one suitable cell is available for camping. By assigning higher reselection priority to certain layers, an operator can influence idle-mode UE distribution - for example, encouraging UEs to camp on a 5G layer where available to ensure faster initial access to 5G services, or directing UEs away from a layer that is being prepared for maintenance. These parameters work alongside reselection thresholds and timers that prevent excessive reselection (ping-ponging) between layers. They do not control network registration eligibility (which depends on subscription and PLMN matching), transmit power limits (a separate RF parameter), or encryption key management (a security function handled through different mechanisms), but they play an important role in idle-mode load distribution and user experience from the moment a device wakes up.

NEW QUESTION # 90
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. Instruct the field engineer to discard the new unit and leave the site without further communication
• B. Continue indefinitely repeating the same remote troubleshooting steps without involving any other teams
• 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 # 91
A cell repeatedly raises and clears 'Cell Unavailable' alarms. Performance data shows PRB utilization dropping to zero during exactly the same periods. Which area should be investigated FIRST as the likely root cause?

• A. NetAct user interface display/theme settings
• B. Possible transport link instability, loss of synchronization reference, or unexpected hardware resets affecting the cell during those periods
• C. The make and model of subscriber handsets in the area
• D. The operator's billing system

Answer: B

Explanation:
When a cell repeatedly raises and clears 'Cell Unavailable' alarms, and PRB utilization simultaneously drops to zero during exactly those same intervals, this pattern strongly indicates the cell is genuinely going out of service intermittently, rather than a display or reporting artifact. The investigation should focus on causes capable of producing repeated, short-duration outages: transport link instability (brief link flaps causing loss of the cell's connectivity), loss of synchronization reference (particularly significant for TDD 5G, where sync loss can force a cell to stop transmitting to avoid interference), or unexpected hardware resets/restarts of the baseband or radio unit, potentially linked to environmental issues such as overheating or power fluctuations.
NetAct UI theme settings, subscriber handset models, and the billing system are entirely unrelated to RAN service availability and would not explain this correlated alarm and KPI pattern. Correlating alarm timing with PM data and environmental/transport alarms is a key NOC diagnostic technique.

NEW QUESTION # 92
......

Pass Your Next NRN-522 Certification Exam Easily & Hassle Free: https://www.testbraindump.com/NRN-522-exam-prep.html