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| Section | Objectives |
|---|---|
| Fixed network architectures and broadband access | - Passive Optical Networks (PON) - Optical Distribution Network (ODN) - Fixed Wireless Access (FWA) - Broadband network architecture - FTTH and FTTx technologies |
| Service delivery and operations | - Service provisioning - Network monitoring and troubleshooting - Voice, Internet and IPTV services - High-Speed Internet (HSI) |
| Software Defined Access Network (SDAN) | - Altiplano Access Controller - Subscriber and service management - Network topology and service health - Corteca platform |
| Nokia fixed access portfolio | - Optical Network Terminals (ONTs) - Home networking devices - FastMile FWA solutions - Lightspan FX and MF Optical Line Terminals |
| Management interfaces and automation | - CLI fundamentals - YANG data models - NETCONF - Telemetry and automation concepts |
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16. 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.
17. Frage
Which Wi-Fi 7 capability allows a compatible device to use more than one frequency-band link as part of the same connection?
Antwort: D
Begründung:
Multi-Link Operation is a major Wi-Fi 7 capability that enables compatible devices to establish and coordinate multiple radio links, potentially across frequency bands such as 5 GHz and 6 GHz. Depending on the implementation, traffic can be distributed across links to increase throughput or moved between links to reduce latency and avoid interference. Earlier Wi-Fi generations generally treated a client's band connection more independently. Dynamic Bandwidth Allocation schedules upstream PON capacity, DSL vectoring mitigates copper-pair crosstalk, and VLAN stacking carries multiple VLAN identifiers in Ethernet frames. Multi-Link Operation requires support from both the access point and client. Actual performance also depends on spectrum availability, channel conditions, device capabilities, regulatory constraints, and the capacity of the access point's wired or wireless backhaul.
18. 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?
Antwort: C
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.
19. Frage
In an IPFIX deployment, which component observes traffic and sends flow records to a receiving system?
Antwort: D
Begründung:
An IPFIX exporting process observes traffic at an observation point, creates flow records, and sends those records to an IPFIX collecting process. Templates describe the fields contained in the exported records, allowing the collector to interpret information such as source and destination addresses, transport ports, protocol identifiers, counters, and timestamps. The collector can store and analyze these records for traffic visibility, capacity planning, troubleshooting, accounting, or security analysis. IPFIX does not permanently store all collected information on the exporting network device. A passive optical splitter cannot inspect or export traffic because it has no active processing functions. An 802.1X supplicant participates in access authentication, while a SIP registrar maintains information used to locate SIP users or endpoints.
20. Frage
Which of the following statements correctly distinguishes traffic shaping from traffic policing?
Antwort: B
Begründung:
Traffic shaping regulates an outgoing traffic stream by buffering packets that temporarily exceed the configured rate and transmitting them later. This smooths bursts but can introduce additional latency because packets remain in a queue. Traffic policing checks traffic against configured rate limits without normally delaying nonconforming packets. Depending on the policy, packets exceeding the permitted profile can be dropped or marked with a lower priority. Both mechanisms are QoS tools and are independent of whether the physical access medium is fiber, copper, or wireless. They also do not control multicast membership or VLAN assignment. In a fixed-access network, shaping can help produce a smoother egress rate, while policing can enforce subscriber or service bandwidth limits at an ingress boundary.
21. Frage
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