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| Section | Objectives |
|---|---|
| Topic 1: Access Network | - Access network architecture - Multicast protocols for video distribution - Quality of Service (QoS) fundamentals - Optical Line Terminal (OLT) functionality |
| Topic 2: Home Network | - Home network connectivity - Wi-Fi fundamentals - Home network devices - Home network device management |
| Topic 3: Broadband Services | - IPTV services - Value-added and triple-play services - High-speed Internet services - Intent-Based Networking (IBN) - Voice services - Intent mapping to network layers - Lightspan service components |
| Topic 4: Fixed Networks Management | - Altiplano SDAN Controller - NFV and SDN fundamentals - Nokia SDAN solution - Corteca home device controller - NETCONF and YANG - IPFIX telemetry collection |
| Topic 5: Introduction to Fixed Networks | - FTTH concepts and solutions - Fixed Wireless Access (FWA) - FTTx concepts and solutions - Broadband network fundamentals - Broadband access services |
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質問 # 11
What is a typical function of the Network Termination card in a Nokia Lightspan access node?
正解：B
解説：
The Network Termination card provides network-facing connectivity for a Lightspan access node. Its faceplate can contain connectors and optical cages used to connect the node to external aggregation, transport, management, synchronization, or other supported interfaces. The card participates in forwarding traffic between subscriber-facing line termination resources and the upstream network. It is an active component and must not be confused with a passive optical splitter in the outside plant. It also does not provide in-home Wi-Fi directly to subscriber devices; that function belongs to a residential gateway or Wi-Fi access point. Analog telephones are normally connected through voice-capable subscriber equipment, such as an ONT with appropriate telephone interfaces, rather than directly to the Lightspan NT card.
質問 # 12
What is the primary benefit of enabling IGMP snooping on a Layer 2 device carrying IPTV multicast traffic?
正解：C
解説：
IGMP snooping allows a Layer 2 device to examine IGMP messages exchanged between multicast receivers and the multicast router or querier. From these messages, the device learns which ports lead to hosts that have joined particular multicast groups. It can then forward each multicast stream only to the relevant ports instead of flooding it throughout the broadcast domain. This conserves access bandwidth and prevents subscribers from receiving unnecessary IPTV traffic. IGMP snooping does not replace multicast routing, which remains a Layer 3 function. It also does not prevent hosts from sending membership reports; those reports are essential for learning group membership. The feature is particularly valuable in fixed-access IPTV deployments where several high-bitrate channels may be transported across shared aggregation and subscriber-facing infrastructure.
質問 # 13
Within the ETSI NFV management and orchestration architecture, which functional block manages virtualized compute, storage, and networking resources?
正解：D
解説：
The Virtualized Infrastructure Manager manages the compute, storage, and networking resources that form the NFV Infrastructure. Its responsibilities can include allocating resources to virtual workloads, tracking available capacity, and controlling the virtualized environment. The Virtual Network Functions Manager has a different role: it manages the lifecycle of VNF instances, including operations such as instantiation, scaling, updating, and termination. Higher-level NFV orchestration coordinates network services and resources across the NFV environment. A traditional Network Management System can perform fault, configuration, accounting, performance, and security management, but it is not the NFV functional block specifically defined to control virtual infrastructure resources. An ONT is subscriber-premises access equipment and is unrelated to NFV infrastructure resource management.
Batch 2: Questions 11-20
質問 # 14
What is a key characteristic of software disaggregation in an access network?
正解：C
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 # 15
What is a principal responsibility of the NFV Orchestrator in an NFV environment?
正解：A
解説：
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.
質問 # 16
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