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| Section | Objectives |
|---|---|
| Topic 1: Management interfaces and automation | - Telemetry and automation concepts - NETCONF - YANG data models - CLI fundamentals |
| Topic 2: Nokia fixed access portfolio | - FastMile FWA solutions - Optical Network Terminals (ONTs) - Lightspan FX and MF Optical Line Terminals - Home networking devices |
| Topic 3: Fixed network architectures and broadband access | - Passive Optical Networks (PON) - FTTH and FTTx technologies - Fixed Wireless Access (FWA) - Broadband network architecture - Optical Distribution Network (ODN) |
| Topic 4: Software Defined Access Network (SDAN) | - Altiplano Access Controller - Corteca platform - Subscriber and service management - Network topology and service health |
| Topic 5: Service delivery and operations | - Voice, Internet and IPTV services - High-Speed Internet (HSI) - Service provisioning - Network monitoring and troubleshooting |
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11. Frage
In a GPON system using Dynamic Bandwidth Allocation, which device determines when an ONT may transmit upstream traffic?
Antwort: C
Begründung:
The OLT controls upstream access to the shared GPON medium. Multiple ONTs use the same upstream wavelength, so uncoordinated transmissions could overlap and cause collisions. Through Dynamic Bandwidth Allocation, the OLT evaluates bandwidth requirements and assigns upstream transmission grants to the ONTs. These grants specify when an ONT can transmit and how much upstream capacity it may use. Traffic containers, or T-CONTs, help represent different upstream traffic and service requirements. The passive splitter cannot schedule traffic because it has no processing capability. The residential gateway handles subscriber-side functions, while an aggregation switch forwards Ethernet traffic beyond the access network. Centralized upstream scheduling enables efficient bandwidth sharing and helps the operator support different service priorities and performance commitments across subscribers.
12. Frage
Which Lightspan interface type normally connects an access node directly to subscriber-facing equipment?
Antwort: D
Begründung:
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.
13. Frage
Which transport protocol is commonly used to provide a secure connection for NETCONF sessions?
Antwort: C
Begründung:
NETCONF is commonly transported over Secure Shell, which provides encryption, integrity protection, and peer authentication for the management session. After establishing the secure transport connection, the client and server exchange NETCONF capabilities and use RPC messages to retrieve or modify device data. IGMP manages IPv4 multicast group membership and does not provide a secure management transport. ARP resolves IPv4 addresses to Layer 2 hardware addresses within a local network. SIP establishes and manages communication sessions such as voice calls. Although NETCONF can conceptually operate over supported secure transports, NETCONF over SSH is the widely recognized deployment model. Secure transport is particularly important because NETCONF can expose operational information and perform configuration changes that materially affect access-network devices and subscriber services.
14. Frage
In a voice service delivered through an ONT, which component commonly provides signaling toward the operator's SIP infrastructure?
Antwort: D
Begründung:
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.
15. Frage
What is the primary function of the cladding in an optical fiber?
Antwort: D
Begründung:
The cladding surrounds the optical fiber core and has a lower refractive index than the core. This difference causes light to remain confined within the core through total internal reflection, allowing the optical signal to travel along the fiber. The cladding does not generate or amplify light; transmitters and optical amplifiers perform those functions. It also does not divide an optical signal among subscribers, which is the role of a passive optical splitter in an Optical Distribution Network. Outside the cladding, protective coatings and buffers help protect the glass from moisture, bending, and mechanical damage. The core and cladding therefore perform essential optical functions, while the surrounding protective layers primarily provide physical protection.
16. Frage
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