Nokia Fixed Networks Fundamentals 4A0-F10 Exam Questions

Answer : A

The Corteca mobile application provides subscriber-facing capabilities that can support self-installation and home Wi-Fi management. Depending on the enabled service, the subscriber can receive installation guidance, view the home network, manage connected devices, and perform supported troubleshooting or configuration tasks. The service provider uses other Corteca platform components for centralized service management, visibility, and operational control. An OLT network termination card provides access-node network connectivity and is not a subscriber application. An IPFIX collector receives traffic-flow records, while a NETCONF candidate datastore holds proposed device configuration before it is committed. Separating subscriber-facing and operator-facing functions allows the provider to offer controlled self-service capabilities without exposing the complete network-management environment or low-level access-device configuration to the end user.

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Answer : A

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.

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Answer : B

A passive optical splitter divides an incoming optical signal into multiple output paths without requiring electrical power. It is a fundamental component of the Optical Distribution Network connecting an OLT to multiple ONTs or ONUs. The splitter does not regenerate, amplify, or actively switch the optical signal. Consequently, splitting introduces optical loss that must be considered when calculating the PON power budget. The OLT and ONT are active devices because they require power to transmit, receive, process, and convert signals. A residential gateway also requires power to provide functions such as routing, firewall enforcement, DHCP, Ethernet switching, and Wi-Fi connectivity. The use of passive splitters reduces the need for powered equipment in the outside plant, which can simplify field maintenance and lower operational costs.

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Answer : A

ADSL uses frequency-division techniques to place traditional analog voice and broadband data in different portions of the available copper-pair spectrum. The lower-frequency range is reserved for voice, while higher-frequency ranges carry upstream and downstream DSL data. Filters or splitters separate these frequency ranges at the subscriber and network sides, allowing a telephone call and an Internet session to operate simultaneously. The services are not required to alternate in time, and an optical wavelength is not involved because ADSL operates over copper. GPON time-slot scheduling applies to upstream transmissions from ONTs on a passive optical network, not to ADSL voice separation. Line quality, loop length, attenuation, and interference affect the data rate that ADSL can achieve.

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Answer : B

Zero-Touch Provisioning allows a newly connected gateway or Wi-Fi device to discover the appropriate management environment and obtain its required configuration with minimal manual intervention. This reduces installation time, lowers the chance of configuration errors, and makes subscriber self-installation more practical. In a managed home-network solution, the device can be associated with the subscriber, receive service parameters, and become visible to the provider's management platform. Zero-Touch Provisioning does not mean that no configuration exists; it means the configuration is delivered automatically instead of being entered locally by a technician. It also does not prevent management communication or turn an active gateway into a passive device. Successful provisioning still depends on network connectivity, device identity, authorization, and compatible management procedures.

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Answer : A

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.

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Answer : B

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.

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