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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Performance Monitoring and Optimization | 20% | - Key performance indicators (KPIs)
|
| Topic 2: Security and Compliance | 10% | - Security features and procedures
|
| Topic 3: Network Configuration and Management | 25% | - Parameter management and configuration
|
| Topic 4: 5G RAN Architecture and Fundamentals | 20% | - Protocol stack and interfaces
|
| Topic 5: Fault Management and Troubleshooting | 25% | - Common issues and solutions
|
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NEW QUESTION # 80
Why is it important for NOC personnel to establish a KPI baseline for each cell or site before evaluating whether current performance indicates a problem?
Answer: B
Explanation:
Establishing a KPI baseline for each cell or site - representing typical performance under normal operating conditions, accounting for factors such as time-of-day traffic patterns, geography, and cell configuration - provides the reference point against which current performance can be meaningfully compared. Without a baseline, it is difficult to tell whether an observed KPI value represents a genuine degradation requiring investigation, or simply normal variation for that particular cell. For example, a busy urban cell may normally operate with higher PRB utilization than a rural cell, so what is alarming for one cell may be entirely typical for another. Baselines support effective threshold setting for alerts, help prioritize investigation effort toward genuine anomalies, and are referenced continuously - not only during initial commissioning - whenever assessing whether performance has changed meaningfully. Baselines have no relationship to a cell's maximum transmit power, which is a separate RF configuration parameter.
NEW QUESTION # 81
A 'Loss of Synchronization Reference' alarm appears on a 5G cell. Which input to the BTS is this alarm most directly associated with?
Answer: D
Explanation:
5G base stations require accurate frequency, and for many configurations (especially TDD operation and features like carrier aggregation) phase/time synchronization, typically derived from a GNSS receiver such as GPS or from a network-distributed timing source such as Synchronous Ethernet or PTP/IEEE 1588 over the transport network. A 'Loss of Synchronization Reference' alarm indicates the BTS has lost access to its timing source. This can lead to degraded performance and, in TDD deployments, can cause uplink/downlink timing misalignment between neighboring cells (interference), and may force the cell out of service if synchronization cannot be maintained. The correct troubleshooting focus is therefore the GNSS antenna
/receiver, related cabling, satellite visibility/obstructions, or the alternative network-based synchronization path - not neighbor relation configuration, handover KPIs, or NetAct account credentials, none of which relate to the BTS's timing reference source.
NEW QUESTION # 82
An AirScale base station simultaneously raises a 'Cell Out of Service' alarm and an 'RF unit communication failure' alarm. How should a NOC engineer typically interpret this combination using alarm correlation principles?
Answer: C
Explanation:
Alarm correlation in Fault Management helps distinguish a root-cause alarm from symptom (consequent) alarms that appear together for a single underlying problem. In this scenario, an RF unit communication failure indicates a problem with the radio hardware or its link to the baseband, which directly prevents the cell served by that RF unit from operating - this generates the Cell Out of Service alarm as a direct consequence. NOC procedure is to focus remediation on the root-cause alarm (the RF unit communication failure); resolving it should automatically clear the dependent Cell Out of Service alarm. Treating both as separate, unrelated faults wastes troubleshooting effort on what is really a single underlying issue. NetAct can display many simultaneous alarms per element, and a Cell Out of Service alarm is itself a symptom, not a cause of hardware failure.
NEW QUESTION # 83
What is the primary purpose of the secure IPsec VPN tunnel established between a centralized Operations Center and a remote 5G site's transport network?
Answer: C
Explanation:
Centralized Operations Centers connect to many geographically distributed 5G sites over shared transport infrastructure that may include third-party or public network segments. A secure tunnel, typically using IPsec, is established between the Operations Center's management domain and the site's security gateway to encrypt and authenticate all Operations, Administration, and Maintenance (O and M) traffic - including configuration commands, alarm and performance data, and software transfers - protecting it from interception, tampering, or unauthorized access. This secure channel has no effect on RF transmit power, which is governed by separate cell configuration parameters, and it does not perform software compression, which is a function of the software packaging process itself. It also does not replace alarm monitoring, which is handled by NetAct's Fault Management module; rather, the VPN ensures that alarm data itself reaches the Operations Center securely.
NEW QUESTION # 84
What does the NR-ARFCN (NR Absolute Radio Frequency Channel Number) represent in a 5G cell's configuration?
Answer: C
Explanation:
The NR Absolute Radio Frequency Channel Number (NR-ARFCN) is a standardized numbering scheme defined for 5G NR that maps specific numeric values to corresponding carrier frequencies across the supported frequency range. When configuring a cell, the NR-ARFCN value (rather than specifying the frequency directly in MHz) is used to unambiguously identify the exact carrier frequency the cell will operate on, ensuring consistency across equipment from different vendors and alignment with regulatory frequency allocations. Correct NR-ARFCN configuration is essential for frequency planning, neighbor relation setup (since inter-frequency relations reference the target cell's frequency), and avoiding interference with adjacent operators or bands. This parameter is unrelated to subscriber database identifiers, alarm counts, or PRB utilization, all of which are tracked through entirely separate configuration management, fault management, or performance management mechanisms respectively.
NEW QUESTION # 85
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