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| Section | Objectives |
|---|---|
| Topic 1: Software Defined Access Network (SDAN) | - Subscriber and service management - Altiplano Access Controller - Network topology and service health - Corteca platform |
| Topic 2: Service delivery and operations | - High-Speed Internet (HSI) - Voice, Internet and IPTV services - Network monitoring and troubleshooting - Service provisioning |
| Topic 3: Management interfaces and automation | - YANG data models - NETCONF - CLI fundamentals - Telemetry and automation concepts |
| Topic 4: Nokia fixed access portfolio | - Optical Network Terminals (ONTs) - Home networking devices - FastMile FWA solutions - Lightspan FX and MF Optical Line Terminals |
| Topic 5: Fixed network architectures and broadband access | - Broadband network architecture - Passive Optical Networks (PON) - FTTH and FTTx technologies - Fixed Wireless Access (FWA) - Optical Distribution Network (ODN) |
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22. Frage
An optical link experiences unexpectedly high signal loss immediately after a fiber cable is routed around a very tight corner. What is the most likely cause?
Antwort: A
Begründung:
Macrobending occurs when an optical fiber is bent with a radius smaller than its supported minimum bend radius. The excessive bend can cause part of the optical signal to escape from the core, increasing attenuation and reducing the received optical power. This problem can appear after poor cable installation, improper storage, or routing the cable sharply around structural objects. Chromatic dispersion causes different wavelengths or spectral components of an optical pulse to travel at slightly different speeds, but it is not normally triggered by one tight physical corner. DSL crosstalk applies to copper pairs, while Dynamic Bandwidth Allocation controls upstream transmission opportunities in a PON. Correcting the cable routing and respecting the specified bend radius can remove or reduce the loss.
23. Frage
In a Lightspan High-Speed Internet service architecture, what is the role of the HSI VPLS on the IHUB?
Antwort: A
Begründung:
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.
24. Frage
Which YANG node type represents multiple scalar values under the same node name without allowing child nodes?
Antwort: D
Begründung:
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.
25. Frage
What is a typical function of the Network Termination card in a Nokia Lightspan access node?
Antwort: A
Begründung:
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.
26. Frage
Which Lightspan interface type normally connects an access node directly to subscriber-facing equipment?
Antwort: A
Begründung:
A User Network Interface is the subscriber-facing interface through which an access node connects to customer-side equipment or services. Depending on the access technology, this relationship can involve ONTs, subscriber ports, or other access termination functions. A Network-to-Network Interface connects the access node toward another network device, typically the Ethernet aggregation or transport network. A subtending interface is used when one access node is connected through another access node, allowing the downstream node's traffic to reach the aggregation network through the upstream node. A loopback interface is a logical interface generally used for management, routing identification, or testing and is not a physical subscriber connection. Correctly distinguishing UNI, NNI, and subtending roles is essential when interpreting an access-node datapath.
27. Frage
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