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| Section | Objectives |
|---|---|
| Introduction to Fixed Networks | - Broadband network fundamentals - FTTx concepts and solutions - Broadband access services - FTTH concepts and solutions - Fixed Wireless Access (FWA) |
| Fixed Networks Management | - Altiplano SDAN Controller - Corteca home device controller - Nokia SDAN solution - NFV and SDN fundamentals - IPFIX telemetry collection - NETCONF and YANG |
| Home Network | - Home network device management - Wi-Fi fundamentals - Home network devices - Home network connectivity |
| Access Network | - Optical Line Terminal (OLT) functionality - Multicast protocols for video distribution - Quality of Service (QoS) fundamentals - Access network architecture |
| Broadband Services | - IPTV services - High-speed Internet services - Intent-Based Networking (IBN) - Intent mapping to network layers - Voice services - Value-added and triple-play services - Lightspan service components |
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質問 # 15
A service provider combines two copper pairs to increase the available DSL rate for one subscriber. Which technology is being used?
正解：C
解説：
DSL bonding combines two or more physical copper pairs into a single logical subscriber connection. Traffic is distributed across the available pairs, allowing the aggregate bitrate to increase, provided the individual lines have suitable quality and compatible performance. Bonding can also provide operational benefits where one pair alone cannot deliver the required service rate. It is different from vectoring, which reduces crosstalk among coordinated copper lines by generating compensating signals. Optical splitting divides optical power in a PON and does not combine copper capacity. Multicast replication creates copies of multicast packets for different receiver paths and is unrelated to DSL transmission capacity. Both ends of a bonded DSL connection must support the applicable bonding method and coordinate traffic across the paired lines.
質問 # 16
A QoS policy examines a packet's markings and assigns it to a forwarding class. Which QoS function is being performed?
正解：D
解説：
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.
質問 # 17
Which Corteca component is intended primarily for use by the subscriber during Wi-Fi installation and management?
正解：A
解説：
The Corteca mobile application provides subscriber-facing capabilities that can support self-installation and home Wi-Fi management. Depending on the enabled service, the subscriber can receive installation guidance, view the home network, manage connected devices, and perform supported troubleshooting or configuration tasks. The service provider uses other Corteca platform components for centralized service management, visibility, and operational control. An OLT network termination card provides access-node network connectivity and is not a subscriber application. An IPFIX collector receives traffic-flow records, while a NETCONF candidate datastore holds proposed device configuration before it is committed. Separating subscriber-facing and operator-facing functions allows the provider to offer controlled self-service capabilities without exposing the complete network-management environment or low-level access-device configuration to the end user.
質問 # 18
In a Lightspan High-Speed Internet service architecture, what is the role of the HSI VPLS on the IHUB?
正解：D
解説：
The HSI VPLS on the integrated hub provides the Layer 2 switching context used to carry High-Speed Internet traffic between HSI forwarders and the network-facing side of the access node. Subscriber traffic arriving through an ONT is associated with an HSI forwarder on the relevant line termination resources. The forwarder connects that traffic to the HSI VPLS, which then switches it toward one or more NNIs leading to the aggregation network. The VPLS does not perform optical-to-analog voice conversion, Wi-Fi radio management, or DSL vectoring. Those functions belong to different service components or technologies. This logical service architecture allows subscriber-facing resources and network-facing interfaces to participate in a controlled Ethernet forwarding domain while supporting the required service separation and policies.
質問 # 19
What is the primary function of the cladding in an optical fiber?
正解：D
質問 # 20
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