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| Section | Objectives |
|---|---|
| Broadband Services | - Lightspan service components - Internet, IPTV and voice services |
| Access Network | - Multicast and QoS principles - Access network architecture - OLT functions |
| Introduction to Fixed Networks | - Broadband access fundamentals - FTTH, FTTx and FWA solutions |
| Fixed Networks Management | - Altiplano Software-Defined Access Network (SDAN) - Netconf/YANG and telemetry - NFV and SDN concepts |
| Home Network | - Home devices and connectivity - Wi-Fi fundamentals |
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NEW QUESTION # 27
Which of the following statements correctly describes downstream and upstream transmission in a GPON network?
Answer: B
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 # 28
A QoS policy examines a packet's markings and assigns it to a forwarding class. Which QoS function is being performed?
Answer: D
Explanation:
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.
NEW QUESTION # 29
In an IPFIX deployment, which component observes traffic and sends flow records to a receiving system?
Answer: C
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 # 30
What is a typical function of the Network Termination card in a Nokia Lightspan access node?
Answer: A
Explanation:
The Network Termination card provides network-facing connectivity for a Lightspan access node. Its faceplate can contain connectors and optical cages used to connect the node to external aggregation, transport, management, synchronization, or other supported interfaces. The card participates in forwarding traffic between subscriber-facing line termination resources and the upstream network. It is an active component and must not be confused with a passive optical splitter in the outside plant. It also does not provide in-home Wi-Fi directly to subscriber devices; that function belongs to a residential gateway or Wi-Fi access point. Analog telephones are normally connected through voice-capable subscriber equipment, such as an ONT with appropriate telephone interfaces, rather than directly to the Lightspan NT card.
NEW QUESTION # 31
What is a principal responsibility of the NFV Orchestrator in an NFV environment?
Answer: B
Explanation:
The NFV Orchestrator coordinates the lifecycle of network services composed of one or more virtualized network functions and helps coordinate the infrastructure resources required by those services. It can work with Virtual Network Functions Managers and Virtualized Infrastructure Managers during service instantiation, scaling, modification, and termination. The VNFM focuses on the lifecycle of VNF instances, while the VIM manages virtualized compute, storage, and networking resources. The NFV Orchestrator does not terminate GPON optical signals, manage individual home Wi-Fi radio channels as its primary function, or perform physical fiber installation. Its higher-level coordination role helps translate a network-service definition into the deployment and resource actions necessary to create and maintain that service within the virtualized environment.
NEW QUESTION # 32
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