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| Section | Objectives |
|---|---|
| Topic 1: Home Network | - Home network device management - Home network devices - Home network connectivity - Wi-Fi fundamentals |
| Topic 2: Fixed Networks Management | - Corteca home device controller - NFV and SDN fundamentals - IPFIX telemetry collection - NETCONF and YANG - Altiplano SDAN Controller - Nokia SDAN solution |
| Topic 3: Broadband Services | - Lightspan service components - Voice services - Intent-Based Networking (IBN) - IPTV services - Intent mapping to network layers - Value-added and triple-play services - High-speed Internet services |
| Topic 4: Introduction to Fixed Networks | - FTTx concepts and solutions - FTTH concepts and solutions - Broadband network fundamentals - Fixed Wireless Access (FWA) - Broadband access services |
| Topic 5: Access Network | - Multicast protocols for video distribution - Quality of Service (QoS) fundamentals - Access network architecture - Optical Line Terminal (OLT) functionality |
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NEW QUESTION # 38
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?
Answer: D
Explanation:
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.
NEW QUESTION # 39
In a GPON system using Dynamic Bandwidth Allocation, which device determines when an ONT may transmit upstream traffic?
Answer: D
Explanation:
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.
NEW QUESTION # 40
Which of the following statements correctly describes downstream and upstream transmission in a GPON network?
Answer: D
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 # 41
Why must a managed ONT or residential gateway be reachable before an Auto Configuration Server can provision it using TR-069?
Answer: C
Explanation:
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.
NEW QUESTION # 42
In an IPFIX deployment, which component observes traffic and sends flow records to a receiving system?
Answer: D
Explanation:
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.
NEW QUESTION # 43
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