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| Section | Objectives |
|---|---|
| Topic 1: Configuration Management | - Parameter Administration
|
| Topic 2: Software Management | - Base Station Software Operations
|
| Topic 3: 5G RAN Products and Solutions Management | - Network Connectivity and Access
|
| Topic 4: Remote Operations of 5G Radio Access Networks | - 5G RAN Operations Center Procedures
|
| Topic 5: Fault and Alarm Management | - Monitoring and Troubleshooting
|
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NEW QUESTION # 43
Which KPI category does the RRC Connection Setup Success Rate primarily belong to, and what does a sustained drop in this KPI typically indicate?
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 # 44
After a field engineer completes a baseband module replacement and confirms physical installation is complete, which set of remote checks should the NOC engineer perform to verify successful restoration of service?
Answer: D
Explanation:
After a baseband module replacement, comprehensive remote verification is essential to confirm the site has been fully restored to normal operation before the maintenance activity is considered complete. This includes unlocking the affected cell(s) and confirming they successfully return to an in-service state without generating new critical or major alarms (beyond any expected transient alarms during the restart process), verifying that the CPRI or eCPRI links between the new baseband module and the connected RF units are established and reporting normal status (confirming correct physical connectivity and configuration), and monitoring relevant KPIs over a short period to confirm they return to levels consistent with the site's historical baseline, indicating the cell is performing as expected. Relying on indicator lights alone, simply confirming the field engineer's departure, or expecting a PCI change (which would not normally occur as a result of a hardware replacement) would all fail to provide meaningful assurance that the site is fully operational.
NEW QUESTION # 45
The PLMN ID broadcast by a 5G cell is composed of which two elements, and what is its primary function?
Answer: C
Explanation:
The Public Land Mobile Network Identity (PLMN ID) is composed of a Mobile Country Code (MCC), which identifies the country in which the network operates, and a Mobile Network Code (MNC), which identifies the specific mobile network operator within that country. This combination is broadcast by every cell as part of its system information and is used by UEs during network selection and registration to confirm they are camping on a cell belonging to their home operator or an authorized roaming partner. Correct PLMN configuration is fundamental: an incorrect PLMN ID would cause UEs belonging to that operator to treat the cell as unsuitable, preventing any subscribers from camping on it. This is entirely separate from Cell ID/TAC (used for tracking and identification within a network), PCI (used for physical-layer cell identification), and transport-layer addressing such as IP/VLAN configuration, which serve different operational purposes.
NEW QUESTION # 46
What is a 'threshold crossing alert' (TCA), and how does it differ from a standard equipment fault alarm?
Answer: A
Explanation:
A threshold crossing alert (TCA) is generated when a monitored performance counter or KPI - such as PRB utilization, processor load, or a quality metric - crosses an operator-configured threshold value, providing visibility into a performance-related condition that may or may not correspond to an actual hardware fault.
For example, sustained high PRB utilization on a cell might trigger a TCA flagging a capacity concern, prompting capacity planning or optimization actions, even though no equipment has failed. This differs fundamentally from a standard equipment fault alarm, which is raised in direct response to a detected hardware or communication failure condition. TCAs are configurable by the operator, allowing thresholds to be tuned to the network's specific performance targets and capacity planning needs, and they are not limited to software license conditions, nor are they fixed, unconfigurable values.
NEW QUESTION # 47
When planning a maintenance window for a software activation affecting multiple cells at a site, which factor is most important for the NOC team to consider in order to minimize subscriber impact?
Answer: A
Explanation:
Because software activation typically requires affected cells to restart, briefly interrupting service for any actively connected UEs, the most important factor in selecting a maintenance window is identifying a time period when traffic at the site is at its lowest, based on historical traffic pattern analysis. Sites can have different busy-hour profiles depending on their location and the population they serve - for example, a site near a business district may have low traffic late at night, while a site in a residential entertainment area might have different patterns - so generic assumptions about 'off-peak' hours should ideally be validated against actual historical data for that specific site. Software version numbers, PLMN IDs, and current alarm counts have no inherent relationship to traffic levels and should not be used as proxies for determining the best maintenance window; traffic pattern data is the relevant and reliable input for this planning decision.
NEW QUESTION # 48
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