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Nokia 4A0-205 Exam Overview:

Certification Vendor:	Nokia
Exam Name:	Nokia Optical Networking Fundamentals
Exam Number:	4A0-205
Real Exam Qty:	40
Related Certifications:	Nokia Optical Network Services Expert Certification Nokia Certified Optical Network Automation Professional Nokia Optical Network Professional Certification
Exam Duration:	90 minutes
Exam Format:	Multiple Choice
Exam Price:	$125 USD
Available Languages:	English
Sample Questions:	Nokia 4A0-205 Sample Questions
Exam Way:	Pearson VUE testing center or online proctored exam.
Pre Condition:	No mandatory prerequisites.
Official Syllabus URL:	https://www.nokia.com/networks/training/onc/exams/optical-networking-fundamentals/

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Nokia Optical Networking Fundamentals 認定 4A0-205 試験問題 (Q46-Q51):

質問 # 46
How is it possible to check the activation status of GMRE on a node?

A. The GMRE activation status is reported in the supervision state column on the node list
B. The ControlPlane status column on the node list displays the GMRE status for the selected node
C. The GMRE reachability can be tested via ping request from NFM-T
D. The GMRE activation status is reflected on the color of the icon representing the node

正解：A

解説：
The GMRE activation status is reported in the supervision state column on the node list. The supervision state column displays the GMRE status of the node, which is either "Activated" or "Not Activated". This allows the user to quickly check the GMRE activation status of a node without having to ping the node from the NFM-T platform.

質問 # 47
What is the function of a pre-amplifier in an optical network?

A. Through the pre-amplifier, the optical signal is amplified at the transmitter side before it is sent to the line span.
B. Through the pre-amplifier, the optical signal is amplified at the receiver side after it travels along the fiber from another node.
C. Through the pre-amplifier, the optical signal is amplified both the receiver side and at the transmitter side.
D. Through the pre-amplifier, the optical signal is amplified within the node internally to recover internal losses due, for instance, to cascaded filters.

正解：A

解説：
A pre-amplifier is an optical amplifier that is used to boost the power of the received optical signal before it is detected by the receiver in an optical communication system. This is done to overcome the loss of power that occurs as the signal travels through the optical fiber and to ensure that the receiver can detect the signal. The pre-amplification stage is typically located close to the receiver in order to minimize the distance that the signal has to travel between the amplifier and the receiver, which helps to reduce the noise and distortion in the signal.

質問 # 48
What is the function of the express channel interface?

A. It drops high capacity channels in the local node.
B. It enables the high speed route for all channels terminated in the local node.
C. It passes all the channels not terminated in the local node through the downstream node.
D. It enables the high speed route for all channels passing through that interface.

正解：C

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 # 49
What is the purpose of the NFM-T node synchronization?

A. The partial or full node synchronization allows several entities/items defined at EPT level to be retrieved into the NFM-T database (upload from design).
B. The partial or full node synchronization allows several entities/items defined at NFM-T level to be exported into an XML file, to be used as input for EPT (download to design).
C. The partial or full node synchronization allows several entities/items defined at node level to be retrieved into the NFM-T database (upload).
D. The partial or full node synchronization allows several entities/items defined at NFM-T level to be written into the node database (download).

正解：D

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 # 50
Which of the following are the main reasons for fiber attenuation?

A. Refraction and reflection
B. Scattering and absorption
C. Small channel spacing
D. Chromatic dispersion (CD) and polarization mode dispersion

正解：B

質問 # 51
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