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Nokia 4A0-205 Exam Overview:

Certification Vendor:	Nokia
Exam Name:	Nokia Optical Networking Fundamentals
Exam Number:	4A0-205
Exam Price:	$125 USD
Exam Duration:	90 minutes
Exam Format:	Multiple Choice
Real Exam Qty:	40
Related Certifications:	Nokia Optical Network Services Expert Certification Nokia Optical Network Professional Certification Nokia Certified Optical Network Automation Professional
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 Sample Questions (Q22-Q27):

NEW QUESTION # 22
Which of the following statements about the ODUk unit is TRUE?

A. The ODUk contains the FEC.
B. The ODUk is the basic payload that can be electronically groomed and switched in the OTN network.
C. The ODUk is the first container in which the client signal is inserted.
D. The ODUk is processed at an optical level.

Answer: B

Explanation:
Comprehensive and Detailed Explanation From Nokia Optical Networking Fundamentals:
In the Optical Transport Network (OTN) hierarchy, the ODUk (Optical Data Unit of order k) is the fundamental unit for electronic grooming and switching. Unlike the OTUk layer, which is tied to a specific physical optical interface and includes the Forward Error Correction (FEC), the ODUk layer is "path-oriented." This means that in a switched WDM system like the Nokia 1830 PSS-24x, the ODUk containers can be switched across a backplane from one line card to another without needing to deconstruct the entire optical signal.
To clarify the other options: Option A is false because FEC is part of the OTUk (Transport Unit) layer. Option C is false because ODUk processing is entirely electrical (O-E-O must occur to access the ODUk overhead). Option D is false because the OPU (Optical Payload Unit) is actually the "first" container where the client signal is mapped; the ODUk then wraps around the OPU to add path-level monitoring and maintenance signals. Therefore, the ODUk acts as the "virtual container" that allows the network to manage services end-to-end across multiple optical spans.

NEW QUESTION # 23
What is the purpose of the validate step in the EPT design process?

A. This step is used to measure optical power performances over an existing network before making changes.
B. This step is optional and is useful to verify the network element layout before going through the commission step.
C. During this step, the run design action is triggered for network design consistency check and errors fixing.
D. During this step, the configuration available on the involved network elements is compared with the design provided by EPT.

Answer: C

Explanation:
The validate step in the EPT design process is used to trigger the run design action, which is responsible for verifying the consistency of the network design and fixing any errors that may exist. During the validation process, the system will compare the configuration available on the involved network elements and the design provided by EPT, and any discrepancies will be flagged for further investigation or correction.

NEW QUESTION # 24
What is the meaning of demand in EPT?

A. Demand refers to the required number of trails to be automatically created to meet design requirements.
B. Demand refers to the amount of OTN interfaces within a single network element.
C. Demand refers to the required capacity of a single network element in terms of bandwidth.
D. Demand refers to one or more client signal.

Answer: D

Explanation:
Comprehensive and Detailed Explanation From Nokia Optical Networking Fundamentals:
In the context of the Nokia 1830 Engineering and Planning Tool (EPT)-now known as WaveSuite Planner (WS-P)-a Demand is a fundamental planning object that represents the customer's traffic requirement between two or more nodes. Specifically, it refers to one or more client signals that need to be transported across the optical network. When a user defines a demand in EPT, they specify the source and destination nodes, the type of client service (e.g., 10GE, 100GE, or STM-64), the quantity of these services, and the required protection level (e.g., Unprotected, 1+1, or O-SNCP).
The tool uses these defined demands to calculate the most efficient optical path, select the appropriate hardware (transponders and muxponders), and determine the necessary wavelength assignments. While a demand eventually results in the creation of optical trails and utilizes network element capacity, the term itself strictly refers to the input traffic requirement or the client signal(s) that the network is being designed to carry. Without defining demands, the planning tool cannot generate a Bill of Materials (BOM) or perform power balancing simulations, as it wouldn't know the traffic load the physical infrastructure must support.

NEW QUESTION # 25
How many PM bins can be stored, for each data collection point, on PSS systems?

A. 200 x 15-min bins, 90 x 1-day bins and 1 raw bin.
B. 33 x 15-min bins, 8 x 1-day bins and 1 raw bin.
C. 4 x 15-min bins and 1 x 1-day bin.
D. 120 x 15-min bins, 60 x 1-day bins and 1 raw bin.

Answer: B

Explanation:
Comprehensive and Detailed Explanation From Nokia Optical Networking Fundamentals:
Performance Monitoring (PM) is critical for maintaining the health of a Nokia 1830 PSS network. The system collects data such as FEC corrected bits, optical power levels, and ODU-layer errors. According to Nokia's standard node management architecture, each data collection point (such as an optical port or an ODU termination point) stores a specific number of historical "bins" locally on the card or the shelf controller.
The standard storage capacity for these PM statistics is 33 x 15-minute bins (covering the last 8 hours and 15 minutes of granular data) and 8 x 1-day bins (covering the last week of daily totals). Additionally, there is 1 raw bin which contains the "current" accumulating data that has not yet been shifted into a completed 15-minute or 24-hour historical bin. This allows network operators using WS-NOC (WaveSuite Network Operations Center) to retrieve recent historical performance data directly from the NE (Network Element) even if the management system was temporarily disconnected. If longer-term history is required, the management system must be configured to poll and archive these bins into its own database before they are overwritten on the hardware.

NEW QUESTION # 26
What is the definition of OSNR?

A. The OSNR is the ratio between the optical output signal power and the optical input signal power of the device being analyzed.
B. The OSNR is defined as the ratio between the transmitted optical power and the received optical power over 1 km of fiber including both signal and optical noise.
C. The OSNR is defined as the ratio between the optical signal power (including noise) and the optical noise power over a specific spectral bandwidth.
D. The OSNR is defined as the ratio between the average optical signal power and the average optical noise power over a specific spectral bandwidth.

Answer: D

Explanation:
The OSNR is defined as the ratio between the average optical signal power and the average optical noise power over a specific spectral bandwidth. This is also known as the signal-to-noise ratio (SNR), and it is a measure of how much signal is present in the optical signal compared to the noise, usually expressed in decibels (dB).

NEW QUESTION # 27
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