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Nokia 4A0-F10 Exam Syllabus Topics:

Section	Objectives
Topic 1: Introduction to Fixed Networks	- Broadband access fundamentals - FTTH, FTTx and FWA solutions
Topic 2: Broadband Services	- Internet, IPTV and voice services - Lightspan service components
Topic 3: Home Network	- Home devices and connectivity - Wi-Fi fundamentals
Topic 4: Access Network	- OLT functions - Access network architecture - Multicast and QoS principles
Topic 5: Fixed Networks Management	- Netconf/YANG and telemetry - NFV and SDN concepts - Altiplano Software-Defined Access Network (SDAN)

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Nokia Fixed Networks Fundamentals Sample Questions (Q16-Q21):

NEW QUESTION # 16
What is the primary function of the cladding in an optical fiber?

A. To divide one optical signal among multiple subscribers
B. To convert electrical signals into optical signals
C. To keep light confined within the fiber core
D. To amplify optical signals over long distances

Answer: C

NEW QUESTION # 17
Which of the following statements correctly describes downstream and upstream transmission in a GPON network?

A. Both downstream and upstream traffic are continuously broadcast without coordination by the OLT.
B. Downstream traffic uses time slots assigned individually by each ONT, while upstream traffic is broadcast to all ONTs.
C. Downstream traffic is broadcast from the OLT toward the ONTs, while upstream transmissions use OLT-controlled time slots.
D. Downstream and upstream traffic require separate optical fibers between the OLT and each ONT.

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 # 18
What is the primary benefit of enabling IGMP snooping on a Layer 2 device carrying IPTV multicast traffic?

A. It prevents all hosts from sending IGMP membership reports.
B. It forwards multicast traffic only toward ports with interested receivers.
C. It converts multicast packets into unicast packets at the video server.
D. It replaces the multicast routing function performed by upstream routers.

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 # 19
In a voice service delivered through an ONT, which component commonly provides signaling toward the operator's SIP infrastructure?

A. SIP agent on the ONT
B. IGMP snooping process
C. Passive optical splitter
D. Wi-Fi mesh satellite

Answer: A

Explanation:
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.

NEW QUESTION # 20
In an 802.1X-based subscriber authentication design, which role does the residential gateway normally perform?

A. Supplicant
B. Authentication server
C. RADIUS database
D. Multicast querier

Answer: A

Explanation:
The residential gateway normally acts as the 802.1X supplicant. It supplies identity information and participates in the Extensible Authentication Protocol exchange required to obtain network access. The access device or OLT commonly performs the authenticator role, controlling the subscriber-facing port and relaying authentication information between the supplicant and the authentication server. The authentication server, frequently using RADIUS, validates the credentials and returns an authorization result or related policy attributes. The gateway is therefore not itself the RADIUS database or authentication server in this design. A multicast querier performs a separate function by sending IGMP queries to maintain multicast membership information. Before successful authentication, the authenticator generally restricts ordinary subscriber traffic while allowing the authentication exchange required to complete access control.

NEW QUESTION # 21
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