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| Section | Objectives |
|---|---|
| Broadband Services | - Voice services - Lightspan service components - Intent-Based Networking (IBN) - Value-added and triple-play services - Intent mapping to network layers - IPTV services - High-speed Internet services |
| Home Network | - Home network devices - Home network connectivity - Home network device management - Wi-Fi fundamentals |
| Introduction to Fixed Networks | - FTTH concepts and solutions - FTTx concepts and solutions - Broadband network fundamentals - Broadband access services - Fixed Wireless Access (FWA) |
| Access Network | - Access network architecture - Quality of Service (QoS) fundamentals - Optical Line Terminal (OLT) functionality - Multicast protocols for video distribution |
| Fixed Networks Management | - NFV and SDN fundamentals - NETCONF and YANG - IPFIX telemetry collection - Nokia SDAN solution - Altiplano SDAN Controller - Corteca home device controller |
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31. Frage
What is a principal responsibility of the NFV Orchestrator in an NFV environment?
Antwort: D
Begründung:
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.
32. Frage
Which of the following statements correctly distinguishes traffic shaping from traffic policing?
Antwort: D
Begründung:
Traffic shaping regulates an outgoing traffic stream by buffering packets that temporarily exceed the configured rate and transmitting them later. This smooths bursts but can introduce additional latency because packets remain in a queue. Traffic policing checks traffic against configured rate limits without normally delaying nonconforming packets. Depending on the policy, packets exceeding the permitted profile can be dropped or marked with a lower priority. Both mechanisms are QoS tools and are independent of whether the physical access medium is fiber, copper, or wireless. They also do not control multicast membership or VLAN assignment. In a fixed-access network, shaping can help produce a smoother egress rate, while policing can enforce subscriber or service bandwidth limits at an ingress boundary.
33. Frage
Which YANG node type represents multiple scalar values under the same node name without allowing child nodes?
Antwort: B
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.
34. Frage
Why must a managed ONT or residential gateway be reachable before an Auto Configuration Server can provision it using TR-069?
Antwort: B
Begründung:
TR-069 enables remote management through communication between customer-premises equipment and an Auto Configuration Server. The device must be powered, operational, and able to establish or participate in a management session before configuration parameters, software information, diagnostics, or status data can be exchanged. An ACS cannot provision a device that is completely offline because no active communication path exists. TR-069 does not configure passive splitters, which contain no management processor or configurable service logic. The managed device can be located at the subscriber premises and does not need to be inside the central office. Communication is carried over the device's network connection rather than exclusively through an OLT serial console. Authentication and protected transport help secure management exchanges between the device and the ACS.
35. Frage
In a voice service delivered through an ONT, which component commonly provides signaling toward the operator's SIP infrastructure?
Antwort: A
Begründung:
A voice-capable ONT commonly contains a SIP agent that handles signaling toward the operator's SIP registrar and proxy infrastructure. An analog telephone can connect to a telephone interface on the ONT, which converts between the analog user interface and the packet-based voice service. Within the access node, voice traffic can be carried through a voice forwarder and an appropriate VPLS toward the aggregation network. A passive optical splitter merely divides optical power and cannot originate or terminate SIP signaling. A Wi-Fi mesh satellite extends wireless coverage, while IGMP snooping manages Layer 2 forwarding for multicast groups. SIP signaling establishes and manages communication sessions, whereas the actual media stream is commonly carried separately using a real-time transport protocol once the call has been established.
36. Frage
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