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| Section | Objectives |
|---|---|
| Software Defined Access Network (SDAN) | - Network topology and service health - Corteca platform - Subscriber and service management - Altiplano Access Controller |
| Fixed network architectures and broadband access | - Optical Distribution Network (ODN) - FTTH and FTTx technologies - Fixed Wireless Access (FWA) - Passive Optical Networks (PON) - Broadband network architecture |
| Nokia fixed access portfolio | - Lightspan FX and MF Optical Line Terminals - Optical Network Terminals (ONTs) - FastMile FWA solutions - Home networking devices |
| Management interfaces and automation | - YANG data models - NETCONF - Telemetry and automation concepts - CLI fundamentals |
| Service delivery and operations | - Voice, Internet and IPTV services - Service provisioning - Network monitoring and troubleshooting - High-Speed Internet (HSI) |
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NEW QUESTION # 37
Why does an access automation platform store operational state, logs, and telemetry in a common data lake?
Answer: C
Explanation:
A common data lake provides a centralized location for operational state, telemetry, logs, alarms, and other information collected from access-network devices and applications. Centralized data enables monitoring tools to correlate information across multiple nodes, evaluate network health, identify trends, and support analytics-driven automation. Historical data can also assist with troubleshooting, performance baselining, capacity planning, and detection of abnormal behavior. The data lake does not replace physical access devices; it stores information describing their operation. It is intended to make relevant information available to authorized applications rather than prevent historical access. It also does not automatically transform subscriber unicast traffic into multicast. Forwarding behavior is controlled through service and network configuration, whereas the data lake supports visibility, analysis, and operational decision-making.
NEW QUESTION # 38
Which YANG node type represents multiple scalar values under the same node name without allowing child nodes?
Answer: B
Explanation:
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.
NEW QUESTION # 39
Which of the following statements correctly describes downstream and upstream transmission in a GPON network?
Answer: C
Explanation:
GPON uses different transmission methods in the downstream and upstream directions. In the downstream direction, the OLT sends a continuous stream through the passive optical splitter. This stream reaches every connected ONT, but each ONT processes only the frames intended for it. Encryption can protect subscriber traffic from other ONTs on the same PON. In the upstream direction, several ONTs share the same optical fiber and cannot transmit simultaneously without coordination. The OLT therefore assigns transmission opportunities using Time Division Multiple Access. Dynamic Bandwidth Allocation can adjust these upstream grants according to traffic demand and service requirements. Separate fibers are not required for each subscriber because GPON commonly uses wavelength separation to carry downstream and upstream traffic over the same fiber infrastructure.
NEW QUESTION # 40
A QoS policy examines a packet's markings and assigns it to a forwarding class. Which QoS function is being performed?
Answer: C
Explanation:
Classification examines packet information and determines how the packet should be treated by the QoS system. The decision can use fields such as VLAN priority, Differentiated Services Code Point, protocol information, or interface context. After classification, the packet is assigned to an appropriate forwarding class and queue so that scheduling, congestion management, and other policies can provide the intended treatment. Shaping controls an outgoing rate by buffering excess traffic, while policing enforces a traffic profile by dropping or remarking nonconforming packets. Optical amplification increases optical signal power and is unrelated to packet classification. Effective classification is essential when a fixed-access network carries services with different requirements, such as voice, IPTV, management traffic, and best-effort Internet access.
NEW QUESTION # 41
Which Lightspan interface type normally connects an access node directly to subscriber-facing equipment?
Answer: C
Explanation:
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.
NEW QUESTION # 42
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