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| Section | Objectives |
|---|---|
| Topic 1: Software Defined Access Network (SDAN) | - Corteca platform - Subscriber and service management - Network topology and service health - Altiplano Access Controller |
| Topic 2: Nokia fixed access portfolio | - Lightspan FX and MF Optical Line Terminals - FastMile FWA solutions - Home networking devices - Optical Network Terminals (ONTs) |
| Topic 3: Management interfaces and automation | - CLI fundamentals - NETCONF - YANG data models - Telemetry and automation concepts |
| Topic 4: Service delivery and operations | - Voice, Internet and IPTV services - Network monitoring and troubleshooting - High-Speed Internet (HSI) - Service provisioning |
| Topic 5: Fixed network architectures and broadband access | - FTTH and FTTx technologies - Broadband network architecture - Fixed Wireless Access (FWA) - Optical Distribution Network (ODN) - Passive Optical Networks (PON) |
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NEW QUESTION # 30
Which architectural principle is fundamental to Software-Defined Networking?
Answer: A
Explanation:
A central principle of Software-Defined Networking is the separation of control logic from packet-forwarding functions. The data plane remains responsible for forwarding traffic, while logically centralized control software determines policies and programs network behavior through defined interfaces. Logically centralized does not necessarily mean that all controller functions run on one physical server; they may be distributed for scalability and resilience while presenting a coordinated control view. SDN emphasizes programmability, automation, abstraction, and the use of APIs. It does not require every forwarding device to independently make all high-level policy decisions. It also avoids tightly coupling every function into one fixed proprietary system. In fixed-access networks, these concepts help operators automate service delivery and manage different access devices through common models and controller applications.
NEW QUESTION # 31
What is a principal responsibility of the NFV Orchestrator in an NFV environment?
Answer: D
Explanation:
The NFV Orchestrator coordinates the lifecycle of network services composed of one or more virtualized network functions and helps coordinate the infrastructure resources required by those services. It can work with Virtual Network Functions Managers and Virtualized Infrastructure Managers during service instantiation, scaling, modification, and termination. The VNFM focuses on the lifecycle of VNF instances, while the VIM manages virtualized compute, storage, and networking resources. The NFV Orchestrator does not terminate GPON optical signals, manage individual home Wi-Fi radio channels as its primary function, or perform physical fiber installation. Its higher-level coordination role helps translate a network-service definition into the deployment and resource actions necessary to create and maintain that service within the virtualized environment.
NEW QUESTION # 32
What is the primary purpose of vectoring in a DSL access network?
Answer: B
Explanation:
DSL vectoring is primarily used to reduce or cancel far-end crosstalk between copper pairs operating within the same cable bundle. Crosstalk can significantly reduce the attainable data rate, particularly with high-frequency technologies such as VDSL2. A vectoring system measures interference among coordinated lines and generates compensating signals that counteract the crosstalk. This can improve connection stability and allow lines to operate closer to their theoretical performance. Vectoring is different from bonding. Bonding combines the capacity of multiple physical copper pairs to increase the aggregate subscriber bitrate. Vectoring also does not divide optical signals because that is the function of a splitter in a passive optical network. Its effectiveness generally depends on coordinating the relevant DSL lines through compatible access equipment.
NEW QUESTION # 33
In a GPON system using Dynamic Bandwidth Allocation, which device determines when an ONT may transmit upstream traffic?
Answer: D
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 # 34
Where should multicast traffic ideally be replicated in a bandwidth-efficient access network?
Answer: B
Explanation:
Multicast is bandwidth-efficient because one stream can be transported across shared network sections and replicated only where paths diverge toward interested receivers. Routers and multicast-aware switching functions use membership and forwarding information to determine which interfaces require a copy. This approach avoids sending a separate end-to-end unicast stream for every viewer and avoids flooding the content to subscribers who did not join the group. IGMP reports communicate receiver membership on IPv4 access networks, while IGMP snooping helps Layer 2 devices restrict forwarding to appropriate ports. Replicating content for every possible subscriber at the source would remove much of multicast's scaling advantage. Likewise, transmitting every stream on every access port would waste bandwidth and could expose receivers to large amounts of unwanted traffic.
NEW QUESTION # 35
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