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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: 5G RAN Architecture and Fundamentals | 20% | - Protocol stack and interfaces
|
| Topic 2: Security and Compliance | 10% | - Security features and procedures
|
| Topic 3: Performance Monitoring and Optimization | 20% | - Key performance indicators (KPIs)
|
| Topic 4: Fault Management and Troubleshooting | 25% | - Common issues and solutions
|
| Topic 5: Network Configuration and Management | 25% | - Parameter management and configuration
|
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NEW QUESTION # 109
Why is it important for the NOC engineer to confirm the affected cell is locked and showing as out-of-service (in a planned state) before instructing the field engineer to disconnect any RF cabling at the antenna?
Answer: B
Explanation:
Confirming that a cell is locked and in a planned out-of-service state before any physical RF disconnection serves two important purposes. From a safety perspective, a locked cell is not actively transmitting in normal traffic-carrying operation, reducing RF exposure risk to the field engineer working near the antenna or cabling. From an operational perspective, performing the disconnection on a cell already in a planned, controlled state ensures that the resulting loss of RF connectivity is correctly interpreted within the context of an ongoing planned maintenance activity, rather than triggering an unplanned fault condition that might generate urgent alarms, automatic notifications, or even unnecessary escalations to other teams who are unaware that work is in progress. Locking a cell does not increase its transmit power (the opposite is true - it stops normal transmission), does not trigger any automated parts dispatch, and has no effect on PLMN ID or network-wide UE registration, which are unrelated to a single cell's administrative state.
NEW QUESTION # 110
What does the NR-ARFCN (NR Absolute Radio Frequency Channel Number) represent in a 5G cell's configuration?
Answer: C
NEW QUESTION # 111
What is the primary purpose of the Xn interface in a 5G RAN architecture?
Answer: D
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 # 112
A NOC engineer reviewing UE measurement reports notices that two physically adjacent 5G cells are broadcasting the identical Physical Cell Identity (PCI), causing UEs to receive ambiguous reference signals.
What is this condition called, and what is the appropriate remote corrective action?
Answer: D
Explanation:
A PCI collision occurs when two neighboring (geographically adjacent or mutually visible) cells are configured with the same Physical Cell Identity, causing UEs to be unable to reliably distinguish between them based on their synchronization and reference signals. This leads to degraded reference signal measurements, failed handovers, and potential interference between the two cells' signals. This is distinct from PCI confusion, where two non-adjacent cells that share a PCI are both neighbors of a third common cell, creating ambiguity during handover target selection even though the two same-PCI cells are not directly adjacent. The correct remediation for a PCI collision is a PCI replanning exercise, reassigning one of the conflicting cells to a unique PCI value that avoids both direct reuse with its neighbors and problematic modulo relationships that affect reference signal sequences. This is typically performed remotely via configuration management without requiring a site visit.
NEW QUESTION # 113
What is the primary purpose of performing a configuration audit that compares a live network element's current parameter settings against an approved configuration baseline or template?
Answer: C
Explanation:
A configuration audit compares the actual, currently applied parameter settings on a live network element against a reference baseline or approved configuration template that represents the intended, standardized configuration for that element type or role. The primary purpose of this comparison is to detect configuration drift - differences that may have arisen from unauthorized manual changes, incomplete rollbacks, errors during bulk updates, or undocumented local modifications. Identifying such deviations is important for maintaining configuration integrity across the network, ensuring consistent behavior across similar cells, supporting troubleshooting (since unexpected parameter values are a common root cause of localized issues), and meeting internal governance or regulatory compliance requirements around change control. This process is distinct from performance monitoring (PRB utilization, handover success rate), which relies on PM counters, and from fault management, which tracks active alarms - configuration audits specifically address the state of configuration parameters themselves.
NEW QUESTION # 114
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