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| Section | Objectives |
|---|---|
| Nokia fixed access portfolio | - Optical Network Terminals (ONTs) - FastMile FWA solutions - Home networking devices - Lightspan FX and MF Optical Line Terminals |
| Fixed network architectures and broadband access | - Optical Distribution Network (ODN) - Broadband network architecture - FTTH and FTTx technologies - Passive Optical Networks (PON) - Fixed Wireless Access (FWA) |
| Software Defined Access Network (SDAN) | - Altiplano Access Controller - Network topology and service health - Corteca platform - Subscriber and service management |
| Management interfaces and automation | - Telemetry and automation concepts - YANG data models - CLI fundamentals - NETCONF |
| Service delivery and operations | - Network monitoring and troubleshooting - High-Speed Internet (HSI) - Voice, Internet and IPTV services - Service provisioning |
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問題 #11
In a GPON system using Dynamic Bandwidth Allocation, which device determines when an ONT may transmit upstream traffic?
答案：D
解題說明：
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.
問題 #12
What is the primary purpose of vectoring in a DSL access network?
答案：D
解題說明：
DSL vectoring is primarily used to reduce or cancel far-end crosstalk between copper pairs operating within the same cable bundle. Crosstalk can significantly reduce the attainable data rate, particularly with high-frequency technologies such as VDSL2. A vectoring system measures interference among coordinated lines and generates compensating signals that counteract the crosstalk. This can improve connection stability and allow lines to operate closer to their theoretical performance. Vectoring is different from bonding. Bonding combines the capacity of multiple physical copper pairs to increase the aggregate subscriber bitrate. Vectoring also does not divide optical signals because that is the function of a splitter in a passive optical network. Its effectiveness generally depends on coordinating the relevant DSL lines through compatible access equipment.
問題 #13
Which Lightspan interface type normally connects an access node directly to subscriber-facing equipment?
答案：D
解題說明：
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.
問題 #14
A QoS policy examines a packet's markings and assigns it to a forwarding class. Which QoS function is being performed?
答案：D
解題說明：
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.
問題 #15
What is the primary purpose of Zero-Touch Provisioning for a newly installed residential Wi-Fi gateway?
答案：C
解題說明：
Zero-Touch Provisioning allows a newly connected gateway or Wi-Fi device to discover the appropriate management environment and obtain its required configuration with minimal manual intervention. This reduces installation time, lowers the chance of configuration errors, and makes subscriber self-installation more practical. In a managed home-network solution, the device can be associated with the subscriber, receive service parameters, and become visible to the provider's management platform. Zero-Touch Provisioning does not mean that no configuration exists; it means the configuration is delivered automatically instead of being entered locally by a technician. It also does not prevent management communication or turn an active gateway into a passive device. Successful provisioning still depends on network connectivity, device identity, authorization, and compatible management procedures.
問題 #16
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