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| Section | Objectives |
|---|---|
| Network Operations in 5G RAN | - Operations Center procedures
|
| 5G RAN Systems and Fault Management | - Alarm and fault handling
|
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NEW QUESTION # 86
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 # 87
A KPI tracks the percentage of established connections or sessions that end abnormally ('dropped') rather than through a normal release procedure. Which KPI category does this belong to?
Answer: A
Explanation:
Retainability KPIs measure whether connections or sessions that have been successfully established remain stable and are terminated through normal procedures, rather than ending abnormally (a 'drop'). A high abnormal release/drop rate indicates retainability problems - subscribers may experience calls or data sessions ending unexpectedly mid-use, significantly impacting user experience even when the initial connection (accessibility) succeeded. This differs from Accessibility, which measures the success of the initial connection attempt; Mobility, which specifically measures handover performance; and Availability, which measures whether a cell or site is in service over time. Retainability degradation can result from radio link failures, interference, transport instability, or hardware issues affecting an already-active connection. NOC engineers monitoring retainability KPIs focus on the stability of in-progress sessions, a key contributor to overall subscriber-perceived quality of service.
NEW QUESTION # 88
What is the Nokia-recommended access control practice for NOC personnel who remotely manage live production AirScale base stations?
Answer: C
Explanation:
Because a centralized Operations Center manages thousands of live network elements, strict access control is essential to maintaining network integrity and security. Nokia's operational security model requires each engineer to use an individually assigned account, with role-based access control (RBAC) restricting actions to those required for the user's job function - a configuration engineer might have provisioning rights, while a monitoring-only NOC analyst might have read-only access. This least-privilege approach provides full traceability of who performed which action, supports accountability during root-cause investigations, and limits the impact if any single account is compromised. Sharing a generic administrator account destroys individual accountability and increases risk of untraceable changes. Disabling session logging removes the audit trail needed for troubleshooting and compliance. Leaving default factory passwords unchanged is a well-known security vulnerability that must be remediated during commissioning, not a recommended ongoing practice.
NEW QUESTION # 89
A transport alarm 'Ethernet link down' is raised on the BTS-side interface toward the aggregation router. What is an appropriate FIRST remote action for the NOC engineer?
Answer: D
Explanation:
When a transport-side alarm such as 'Ethernet link down' is raised on the BTS-facing interface toward the aggregation router, the appropriate first remote action is to investigate the physical and data-link layer status of that interface - checking link/port status, interface configuration such as speed and duplex settings and VLAN membership, and any visible cable/connector status indicators through management tools. If the issue appears to originate on the transport provider's side of the connection (such as a leased line or microwave link fault), coordinating with that provider is the next step. Only if remote checks cannot resolve the issue, or clearly indicate a physical hardware or cabling fault at the site, would on-site dispatch be considered.
Replacing the RF module addresses radio hardware, not a transport link fault, and modifying neighbor relations or cell bandwidth are RAN configuration changes that would not resolve a physical link failure.
NEW QUESTION # 90
What is the function of the p-Max parameter broadcast by a 5G cell?
Answer: A
Explanation:
The p-Max parameter is broadcast as part of the cell's system information and specifies the maximum transmit power a UE is allowed to use when transmitting on the uplink within that cell. This is a key input to the UE's uplink power control algorithm and serves several purposes: it helps manage uplink interference toward neighboring cells (particularly important in dense deployments or where uplink interference from high-power UEs could degrade performance for users in adjacent cells), and it can also be used to comply with regulatory power limits for a given frequency band or deployment scenario. This parameter governs UE behavior on the uplink and is distinct from configuredMaxTxPower, which governs the gNB's own downlink transmit power. It also has no relationship to the maximum number of connected UEs (a capacity/licensing consideration) or to the cell's configured bandwidth, which are controlled by separate parameters entirely.
NEW QUESTION # 91
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