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質問 # 22
Which of the following statements is true about chromatic dispersion (CD)?
正解：C
解説：
Different wavelengths propagate at different speeds within the same media and therefore different colors travel in the fiber with different speed. This phenomenon is known as chromatic dispersion and causes light to spread out as it travels through the fiber over distance, leading to signal attenuation and distortion. The fiber attenuation does not introduce inter-channel interference, but it can cause attenuation of the signal. Different channels have different bandwidths, but this does not affect CD performance.
質問 # 23
Which of the following statements about the contentionless feature on a CDC-F node is TRUE?
正解：D
解説：
Comprehensive and Detailed Explanation From Nokia Optical Networking Fundamentals:
The term CDC-F stands for Colorless, Directionless, Contentionless, and Flex-grid. While "Colorless" allows any wavelength on any port and "Directionless" allows any port to be routed to any output fiber (degree), Contentionless solves a specific physical limitation of traditional multiplexers. In a standard ROADM, you cannot drop the same wavelength (e.g., Channel 21) from two different directions (e.g., North and West) into the same add/drop structure because they would "contend" or collide on the same internal fiber.
A Contentionless architecture (typically utilizing a Multicast Switch or MCS) allows the node to drop the same wavelength from different degrees simultaneously without interference. This is critical for high-availability mesh networks where a single transponder might need to receive a specific wavelength from a primary path and a backup path. Without contentionless capabilities, operators would have to carefully manage wavelength assignments across the entire network to ensure no two identical frequencies ever meet at the same drop structure, which significantly complicates planning and restoration.
質問 # 24
How can a mesh network be upgraded so that more services can be transported?
正解：D
解説：
Comprehensive and Detailed Explanation From Nokia Optical Networking Fundamentals:
While technologies like WSS (Wavelength Selective Switches) and coherent transmission (100G/200G/400G+) significantly improve the efficiency and reach of a network, the most direct way to increase the total transportable volume of services in a mesh topology is to upgrade link capacity or install new physical links. In Nokia optical planning, upgrading link capacity typically involves moving from a lower-rate system (like 10G) to a higher-rate system (like 100G or 400G) or increasing the number of available wavelengths by expanding from a 40-channel to an 80-channel or 96-channel C-band system.
Adding new links (new fiber spans) creates more degrees in the mesh, providing more paths for traffic and increasing the overall aggregate bandwidth of the network. Option A refers to flexibility (ROADM functionality) rather than raw capacity. Option B (PRC) relates to survivability and availability, not capacity expansion. While Option C (coherent transmission) is a powerful method for increasing capacity per wavelength, it is not the "only" way, as adding more fiber (spatial multiplexing) or more channels (spectral density) are also primary methods for scaling a mesh network to handle more services.
質問 # 25
What is the function of the express channel interface?
正解：A
解説：
Comprehensive and Detailed Explanation From Nokia Optical Networking Fundamentals:
In the context of WDM (Wavelength Division Multiplexing) node architecture, an express channel interface (often associated with OADMs or ROADMs) is specifically designed to handle "through" traffic. In a multi-node optical network, not every wavelength (channel) needs to be processed or terminated at every site it passes. To maintain signal integrity and reduce latency, these wavelengths are kept in the optical domain.
The express interface allows these optical channels-those not terminated or "dropped" at the local node-to bypass the local transponders and multiplexers, flowing directly to the downstream node. This photonic bypass avoids unnecessary O-E-O (Optical-Electrical-Optical) conversions, which would otherwise require expensive hardware and increase power consumption. By utilizing express paths, the Nokia 1830 PSS can scale to support massive core network capacities while ensuring that only the relevant traffic is diverted to the local client-facing ports.
質問 # 26
What is the purpose of the NFM-T node synchronization?
正解：B
解説：
This is done in order to keep the NFM-T database in sync with the nodes in the network. The synchronization process allows the NFM-T to keep track of any changes that are made to the nodes, such as new nodes added, nodes removed, and so on. By synchronizing the node database with the NFM-T, network administrators can ensure that their network is up to date and running efficiently.
質問 # 27
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P.S. Xhs1991がGoogle Driveで共有している無料かつ新しい4A0-205ダンプ：https://drive.google.com/open?id=1tq9KolXzDnTJcOjV7gbk1NF02CSh-3nn