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| Section | Objectives |
|---|---|
| Home Network | - Home network device management - Home network devices - Wi-Fi fundamentals - Home network connectivity |
| Access Network | - Access network architecture - Optical Line Terminal (OLT) functionality - Multicast protocols for video distribution - Quality of Service (QoS) fundamentals |
| Introduction to Fixed Networks | - Broadband network fundamentals - FTTH concepts and solutions - FTTx concepts and solutions - Broadband access services - Fixed Wireless Access (FWA) |
| Fixed Networks Management | - IPFIX telemetry collection - Nokia SDAN solution - NETCONF and YANG - Altiplano SDAN Controller - Corteca home device controller - NFV and SDN fundamentals |
| Broadband Services | - Voice services - High-speed Internet services - Intent-Based Networking (IBN) - Lightspan service components - Value-added and triple-play services - IPTV services - Intent mapping to network layers |
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NEW QUESTION # 20
What is the primary benefit of enabling IGMP snooping on a Layer 2 device carrying IPTV multicast traffic?
Answer: B
Explanation:
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.
NEW QUESTION # 21
Where should multicast traffic ideally be replicated in a bandwidth-efficient access network?
Answer: A
Explanation:
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.
NEW QUESTION # 22
Which Altiplano intent is used to define the uplink interfaces that connect an OLT toward the aggregation network?
Answer: C
NEW QUESTION # 23
What is a principal responsibility of the NFV Orchestrator in an NFV environment?
Answer: B
Explanation:
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.
NEW QUESTION # 24
A YANG model specifies that a configuration leaf can contain an integer from 1 through 4094. What is the principal benefit of this restriction?
Answer: C
Explanation:
YANG can define data types, ranges, patterns, mandatory nodes, default values, and relationships between configuration elements. A range restriction allows management software and network devices to verify that a submitted value falls within the permitted limits. For example, restricting a VLAN-related integer to an appropriate range prevents clearly invalid values from being accepted. This model-driven validation reduces configuration errors and makes automation more predictable. A passive optical splitter has no processing capability and cannot correct invalid configuration. The restriction also does not convert a value into an Ethernet frame or prevent NETCONF access. Instead, NETCONF can carry configuration data structured according to the YANG model, and the server can reject an <edit-config> request when the proposed data violates applicable schema constraints.
NEW QUESTION # 25
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