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Nokia 4A0-F10 Exam Syllabus Topics:

Section	Objectives
Topic 1: Home Network	- Wi-Fi fundamentals - Home network connectivity - Home network device management - Home network devices
Topic 2: Introduction to Fixed Networks	- FTTx concepts and solutions - Broadband network fundamentals - FTTH concepts and solutions - Fixed Wireless Access (FWA) - Broadband access services
Topic 3: Fixed Networks Management	- IPFIX telemetry collection - NETCONF and YANG - Altiplano SDAN Controller - NFV and SDN fundamentals - Nokia SDAN solution - Corteca home device controller
Topic 4: Access Network	- Optical Line Terminal (OLT) functionality - Multicast protocols for video distribution - Access network architecture - Quality of Service (QoS) fundamentals
Topic 5: Broadband Services	- Intent mapping to network layers - IPTV services - Lightspan service components - Value-added and triple-play services - Intent-Based Networking (IBN) - High-speed Internet services - Voice services

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Nokia Fixed Networks Fundamentals 4A0-F10 Prüfungsfragen mit Lösungen (Q24-Q29):

24. 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?

A. Dynamic bandwidth allocation
B. Excessive macrobending
C. DSL crosstalk
D. Chromatic dispersion

Antwort: B

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.

25. Frage
A residential gateway ONT provides routed Internet access to devices in a subscriber's home. Which DHCP role does it normally perform on the home LAN?

A. It acts as a DHCP client for every device connected to the LAN.
B. It acts only as a DHCP relay and never maintains address information.
C. It disables local addressing and assigns public addresses directly from the OLT.
D. It acts as a DHCP server and assigns private IP addresses to home devices.

Antwort: D

Begründung:
A Layer 3 residential gateway normally operates as a DHCP server on the subscriber's home LAN. It assigns private IP addresses and other configuration information, such as the default gateway and DNS server addresses, to connected devices. On its network-facing WAN interface, the gateway may operate as a DHCP client to obtain service parameters from the operator's network. These two DHCP roles must not be confused. The gateway also commonly performs routing, Network Address Translation, firewall enforcement, and local Ethernet or Wi-Fi connectivity. The OLT transports and controls subscriber access traffic but does not normally allocate private LAN addresses directly to individual home devices. This architecture separates the operator-facing connection from the subscriber's private local network and allows multiple home devices to share the broadband service.

26. Frage
Which YANG node type represents multiple scalar values under the same node name without allowing child nodes?

A. Choice
B. List
C. Container
D. Leaf-list

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.

27. Frage
Why must a managed ONT or residential gateway be reachable before an Auto Configuration Server can provision it using TR-069?

A. TR-069 communicates exclusively through an OLT serial console.
B. TR-069 requires an active management session with the device.
C. TR-069 writes configuration directly to a passive splitter.
D. TR-069 can configure only devices that are physically inside the central office.

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.

28. Frage
Which characteristic distinguishes G.fast from traditional ADSL technologies?

A. G.fast carries only voice services and does not support broadband data.
B. fast is designed to deliver high broadband rates over relatively short copper loops, frequently using existing building or drop wiring. It uses a much wider and higher-frequency spectrum than traditional ADSL and commonly employs Time Division Duplexing. With TDD, upstream and downstream transmission use the same frequency spectrum during different time intervals. The upstream-to-downstream capacity ratio can therefore be adjusted through the TDD configuration. Higher frequencies can support greater capacity but experience substantial attenuation over distance, which is why G.fast is best suited to short loops. It does not operate through passive optical splitters, although fiber may be deployed close to the subscriber before the final copper segment. G.fast also supports broadband services rather than voice-only delivery.
C. G.fast operates only over passive optical splitters.
D. G.fast requires a separate copper pair for upstream and downstream traffic.
E. G.fast commonly uses high frequencies and time-division duplexing over short copper loops.

Antwort: E

29. Frage
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