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| Section | Objectives |
|---|---|
| Topic 1: Broadband Services | - Internet, IPTV and voice services - Lightspan service components |
| Topic 2: Introduction to Fixed Networks | - FTTH, FTTx and FWA solutions - Broadband access fundamentals |
| Topic 3: Fixed Networks Management | - Altiplano Software-Defined Access Network (SDAN) - Netconf/YANG and telemetry - NFV and SDN concepts |
| Topic 4: Access Network | - Access network architecture - OLT functions - Multicast and QoS principles |
| Topic 5: Home Network | - Wi-Fi fundamentals - Home devices and connectivity |
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質問 # 35
A network controller must modify configuration data stored on a NETCONF-capable access device. Which NETCONF operation is designed for this purpose?
正解：D
解説：
The NETCONF <edit-config> operation is used to create, change, merge, replace, or delete configuration data in a target configuration datastore. The target can be a datastore such as running or candidate, depending on the capabilities supported by the network device. By comparison, <get-config> retrieves configuration data and does not modify it. <close-session> requests an orderly termination of the current NETCONF session, while <kill-session> forces the termination of another session identified by its session ID. NETCONF operations are carried within RPC messages and commonly transported over a secure protocol such as SSH. YANG models define the structure, types, constraints, and relationships of the configuration and operational data manipulated through NETCONF.
質問 # 36
In a Lightspan High-Speed Internet service architecture, what is the role of the HSI VPLS on the IHUB?
正解：A
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 # 37
Which connection is normally used by a Fixed Wireless Access indoor gateway to reach the service provider's access network?
正解：C
解説：
A Fixed Wireless Access indoor gateway normally uses a 4G or 5G radio connection to reach the service provider's mobile or fixed-wireless access network. Inside the home, the gateway can provide Ethernet and Wi-Fi connectivity to subscriber devices. This separates the wide-area access technology from the in-home distribution technology: cellular radio connects the premises to the operator, while Wi-Fi connects local user devices. A DSLAM is associated with copper-based DSL access, and a passive optical splitter belongs to a PON deployment. A subtending interface connects access nodes rather than a subscriber gateway to a radio network. Depending on the deployment, the FWA gateway may also be remotely provisioned and monitored using an external management platform and standardized CPE-management mechanisms.
質問 # 38
What is a principal responsibility of the NFV Orchestrator in an NFV environment?
正解：B
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 # 39
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 # 40
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