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| Section | Objectives |
|---|---|
| Topic 1: Nokia fixed access portfolio | - Home networking devices - FastMile FWA solutions - Optical Network Terminals (ONTs) - Lightspan FX and MF Optical Line Terminals |
| Topic 2: Fixed network architectures and broadband access | - FTTH and FTTx technologies - Optical Distribution Network (ODN) - Broadband network architecture - Fixed Wireless Access (FWA) - Passive Optical Networks (PON) |
| Topic 3: Management interfaces and automation | - CLI fundamentals - YANG data models - NETCONF - Telemetry and automation concepts |
| Topic 4: Software Defined Access Network (SDAN) | - Subscriber and service management - Network topology and service health - Altiplano Access Controller - Corteca platform |
| Topic 5: Service delivery and operations | - Service provisioning - Voice, Internet and IPTV services - Network monitoring and troubleshooting - High-Speed Internet (HSI) |
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24. Frage
Why must a managed ONT or residential gateway be reachable before an Auto Configuration Server can provision it using TR-069?
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.
25. Frage
Where should multicast traffic ideally be replicated in a bandwidth-efficient access network?
Antwort: D
Begründung:
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.
26. Frage
In an 802.1X-based subscriber authentication design, which role does the residential gateway normally perform?
Antwort: B
Begründung:
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.
27. Frage
How does an ADSL connection support simultaneous traditional voice and broadband data over the same copper pair?
Antwort: D
Begründung:
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.
28. Frage
Which traffic-delivery method is commonly used for a live IPTV channel watched simultaneously by many subscribers?
Antwort: B
Begründung:
Live IPTV channels are commonly distributed using multicast because many subscribers may request the same content at the same time. The network carries a shared stream across common paths and replicates packets only where delivery paths branch toward participating receivers. Subscribers signal membership using protocols such as IGMP. This approach is more bandwidth-efficient than delivering a separate unicast copy from the source to every viewer. Video on Demand is commonly delivered using unicast because each viewer may start, pause, or seek through different content independently. NETCONF notifications carry management events rather than television content. IPTV is packet-based and does not require a separate analog transmission for every copper pair. Effective multicast deployment also depends on correct group control, snooping, routing, QoS, and service-forwarding configuration.
29. Frage
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