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| Section | Objectives |
|---|---|
| Topic 1: Nokia fixed access portfolio | - Home networking devices - Optical Network Terminals (ONTs) - Lightspan FX and MF Optical Line Terminals - FastMile FWA solutions |
| Topic 2: Software Defined Access Network (SDAN) | - Subscriber and service management - Network topology and service health - Corteca platform - Altiplano Access Controller |
| Topic 3: Service delivery and operations | - Voice, Internet and IPTV services - Service provisioning - High-Speed Internet (HSI) - Network monitoring and troubleshooting |
| Topic 4: Management interfaces and automation | - CLI fundamentals - YANG data models - Telemetry and automation concepts - NETCONF |
| Topic 5: Fixed network architectures and broadband access | - Optical Distribution Network (ODN) - Broadband network architecture - Fixed Wireless Access (FWA) - FTTH and FTTx technologies - Passive Optical Networks (PON) |
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NEW QUESTION # 23
Which of the following statements correctly describes downstream and upstream transmission in a GPON network?
Answer: C
Explanation:
GPON uses different transmission methods in the downstream and upstream directions. In the downstream direction, the OLT sends a continuous stream through the passive optical splitter. This stream reaches every connected ONT, but each ONT processes only the frames intended for it. Encryption can protect subscriber traffic from other ONTs on the same PON. In the upstream direction, several ONTs share the same optical fiber and cannot transmit simultaneously without coordination. The OLT therefore assigns transmission opportunities using Time Division Multiple Access. Dynamic Bandwidth Allocation can adjust these upstream grants according to traffic demand and service requirements. Separate fibers are not required for each subscriber because GPON commonly uses wavelength separation to carry downstream and upstream traffic over the same fiber infrastructure.
NEW QUESTION # 24
Why must a managed ONT or residential gateway be reachable before an Auto Configuration Server can provision it using TR-069?
Answer: B
Explanation:
TR-069 enables remote management through communication between customer-premises equipment and an Auto Configuration Server. The device must be powered, operational, and able to establish or participate in a management session before configuration parameters, software information, diagnostics, or status data can be exchanged. An ACS cannot provision a device that is completely offline because no active communication path exists. TR-069 does not configure passive splitters, which contain no management processor or configurable service logic. The managed device can be located at the subscriber premises and does not need to be inside the central office. Communication is carried over the device's network connection rather than exclusively through an OLT serial console. Authentication and protected transport help secure management exchanges between the device and the ACS.
NEW QUESTION # 25
In a GPON system using Dynamic Bandwidth Allocation, which device determines when an ONT may transmit upstream traffic?
Answer: A
Explanation:
The OLT controls upstream access to the shared GPON medium. Multiple ONTs use the same upstream wavelength, so uncoordinated transmissions could overlap and cause collisions. Through Dynamic Bandwidth Allocation, the OLT evaluates bandwidth requirements and assigns upstream transmission grants to the ONTs. These grants specify when an ONT can transmit and how much upstream capacity it may use. Traffic containers, or T-CONTs, help represent different upstream traffic and service requirements. The passive splitter cannot schedule traffic because it has no processing capability. The residential gateway handles subscriber-side functions, while an aggregation switch forwards Ethernet traffic beyond the access network. Centralized upstream scheduling enables efficient bandwidth sharing and helps the operator support different service priorities and performance commitments across subscribers.
NEW QUESTION # 26
Which YANG node type represents multiple scalar values under the same node name without allowing child nodes?
Answer: C
Explanation:
A YANG leaf-list represents a sequence of scalar values of the same defined type. Like a leaf, each value is terminal and cannot contain child nodes. However, unlike a single leaf, a leaf-list can have multiple entries. A YANG list also supports multiple instances, but each list entry can contain child nodes and is normally identified by one or more key leaves. A container groups related child nodes but does not itself represent a repeated collection of scalar values. A choice defines alternative branches in a data model, allowing one set of nodes from the available cases to be selected. Correctly distinguishing these node types is important when interpreting YANG schemas used to configure and monitor access devices through model-driven management interfaces.
NEW QUESTION # 27
What is the primary function of the cladding in an optical fiber?
Answer: D
NEW QUESTION # 28
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