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| Section | Objectives |
|---|---|
| Topic 1: Access Network | - Multicast protocols for video distribution - Optical Line Terminal (OLT) functionality - Access network architecture - Quality of Service (QoS) fundamentals |
| Topic 2: Broadband Services | - Voice services - Lightspan service components - Intent-Based Networking (IBN) - High-speed Internet services - IPTV services - Value-added and triple-play services - Intent mapping to network layers |
| Topic 3: Fixed Networks Management | - Corteca home device controller - Nokia SDAN solution - NFV and SDN fundamentals - NETCONF and YANG - Altiplano SDAN Controller - IPFIX telemetry collection |
| Topic 4: Introduction to Fixed Networks | - Fixed Wireless Access (FWA) - Broadband access services - FTTx concepts and solutions - Broadband network fundamentals - FTTH concepts and solutions |
| Topic 5: Home Network | - Home network connectivity - Wi-Fi fundamentals - Home network device management - Home network devices |
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質問 # 23
In intent-based networking, what does an operator primarily specify through an intent?
正解：A
解説：
An intent describes the desired network outcome or target state rather than requiring the operator to manually enter every device-level command. The intent system maps the requested outcome to the configurations and resources needed on the relevant network elements. It can then compare the intended state with the observed operational state and take corrective action when supported. Intent types, profiles, and associated models provide the logic and parameters required for this translation. An intent does not normally specify the electrical construction of hardware or list every packet to be forwarded. Optical measurements may be used as operational inputs, but they are not the general definition of an intent. This abstraction improves consistency, supports automation, and reduces repetitive device-by-device configuration work.
質問 # 24
What is a key characteristic of software disaggregation in an access network?
正解：B
解説：
Software disaggregation separates access-network software into modules, with each module responsible for a particular functional area. Defined interfaces allow these modules to interact with one another, with higher-level applications, and with abstracted hardware resources. This architecture can improve development flexibility, automation, scalability, and the ability to introduce new functions without replacing an entire vertically integrated platform. It does not mean that all physical constraints disappear or that every module can operate on every device without adaptation. Embedding every function permanently in one appliance describes a tightly integrated architecture rather than disaggregation. APIs are important because they enable communication and programmability between components. Passive optical splitters cannot execute software because they contain no powered processing or control functions.
質問 # 25
Where should multicast traffic ideally be replicated in a bandwidth-efficient access network?
正解：D
解説：
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.
質問 # 26
What is the primary function of the cladding in an optical fiber?
正解：D
解説：
The cladding surrounds the optical fiber core and has a lower refractive index than the core. This difference causes light to remain confined within the core through total internal reflection, allowing the optical signal to travel along the fiber. The cladding does not generate or amplify light; transmitters and optical amplifiers perform those functions. It also does not divide an optical signal among subscribers, which is the role of a passive optical splitter in an Optical Distribution Network. Outside the cladding, protective coatings and buffers help protect the glass from moisture, bending, and mechanical damage. The core and cladding therefore perform essential optical functions, while the surrounding protective layers primarily provide physical protection.
質問 # 27
In a Lightspan High-Speed Internet service architecture, what is the role of the HSI VPLS on the IHUB?
正解：C
解説：
The HSI VPLS on the integrated hub provides the Layer 2 switching context used to carry High-Speed Internet traffic between HSI forwarders and the network-facing side of the access node. Subscriber traffic arriving through an ONT is associated with an HSI forwarder on the relevant line termination resources. The forwarder connects that traffic to the HSI VPLS, which then switches it toward one or more NNIs leading to the aggregation network. The VPLS does not perform optical-to-analog voice conversion, Wi-Fi radio management, or DSL vectoring. Those functions belong to different service components or technologies. This logical service architecture allows subscriber-facing resources and network-facing interfaces to participate in a controlled Ethernet forwarding domain while supporting the required service separation and policies.
質問 # 28
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