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| Section | Objectives |
|---|---|
| Topic 1: Network Operations in 5G RAN | - Remote operation of 5G Radio Access Network
|
| Topic 2: 5G RAN Systems and Fault Management | - Software and configuration management
|
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NEW QUESTION # 93
What is the key difference between a cell that has been administratively 'locked' (disabled) and a cell that reports 'Out of Service' due to a fault?
Answer: C
Explanation:
'Locked' (administratively disabled) describes a deliberate, controlled state set by an operator or engineer - for example, intentionally taking a cell out of service for planned maintenance, an upgrade, or a configuration change window. This is an expected, reversible action: the cell can be 'unlocked' once the work is complete. 'Out of Service' due to a fault, by contrast, reflects an unintended operational failure - the cell was expected to be operating normally, but a fault condition (such as a hardware, transport, or synchronization issue) has prevented it from doing so, typically accompanied by one or more alarms.
Distinguishing these states matters for NOC engineers: a locked cell appearing down is expected and requires no fault investigation, whereas an unexpectedly out-of-service cell requires diagnosis. Neither state inherently relates to transmit power, and out-of-service conditions are not always due to software upgrades.
NEW QUESTION # 94
During PCI planning for a dense cluster of 5G cells, why is it important to avoid assigning PCI values that result in the same PCI modulo group (such as the same PCI mod 3 value) to closely located neighboring cells?
Answer: D
Explanation:
The Physical Cell Identity has mathematical relationships - such as PCI mod 3 and PCI mod 30 - that determine which specific resource elements certain reference signal sequences are mapped to within the radio frame. When two closely located, mutually visible cells share the same PCI mod 3 group, their reference signals for that group occupy the same time-frequency resources, increasing the likelihood of mutual interference on those reference signals. This can degrade channel estimation and measurement accuracy for UEs near the cell edge between the two cells, indirectly impacting handover performance and link quality.
Careful PCI planning therefore considers not just avoiding direct PCI collisions (identical PCI on neighbors) but also distributing PCI mod group assignments across a cluster to minimize this reference signal overlap.
PCI mod values have no bearing on software versioning, bandwidth limits, or Tracking Area grouping, which are configured through entirely separate parameters.
NEW QUESTION # 95
When a software package is transferred to a base station via SFTP as part of a remote software delivery, what is the purpose of performing a checksum verification on the downloaded file before activation?
Answer: D
Explanation:
A checksum (or hash value) verification compares a calculated value derived from the downloaded software file against an expected reference value provided by the software source. If the values match, this confirms that the file was transferred completely and without corruption or unauthorized modification during the transfer process - which is particularly important for large software images transferred over networks where transient errors, interruptions, or transmission issues can occasionally cause partial or corrupted downloads.
Activating a software package from a corrupted or incomplete file could lead to activation failures, unpredictable behavior, or a unit that fails to return to normal operation - even before any compatibility or configuration considerations come into play. Checksum verification is a foundational integrity check performed as part of the software delivery process and has no relationship to programming language translation, geographic location determination, or performance KPI calculations, which are entirely unrelated functions.
NEW QUESTION # 96
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?
Answer: D
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 # 97
Why do NOC teams typically schedule software activation activities - which require a base station restart - for late-night or off-peak hours rather than during the day?
Answer: B
Explanation:
Activating new software on a base station typically requires the affected unit (or units) to restart, which causes a brief interruption to service for any UEs connected through that cell during the restart. To minimize the impact of this unavoidable interruption, NOC teams schedule such activities during maintenance windows that coincide with periods of lowest network traffic - commonly late at night or in the early morning hours - when the fewest subscribers are likely to be actively using the network. This reduces the number of dropped sessions and the overall visibility of the brief outage to end users. There is no technical restriction preventing restarts during daylight hours, nor does activation duration meaningfully change based on time of day, and NetAct does not impose a blanket restriction on when configuration changes can be submitted - the scheduling decision is an operational best practice driven by minimizing customer impact, not a technical limitation.
NEW QUESTION # 98
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