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최신 Nokia Optical Network Professional 4A0-205 무료샘플문제 (Q10-Q15):

질문 # 10
What is the purpose of the validate step in the EPT design process?

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

정답：A

설명：
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.

질문 # 11
WDM allows transmission systems to:

A. Allocate different signals to different time slots
B. Increase the bit rate of each client signal by spreading it over multiple wavelengths
C. Transport multiple signals transparently, onto several wavelengths, all together over one single fiber
D. Share a single signal among multiple fibers doing load balancing, and thus increasing the reliability of the optical transmission

정답：C

설명：
WDM (Wavelength Division Multiplexing) allows transmission systems to transport multiple signals transparently, onto several wavelengths, all together over one single fiber. This allows for increased capacity, as many different signals can be transmitted at the same time and along the same fiber. Other advantages include improved signal integrity and reduced signal attenuation.

질문 # 12
What is a degree-1 node?

A. A node with only one direction and therefore a terminal node
B. A node with only east and west sides without directions towards north and south
C. A node with only one express channel and therefore made of two sides
D. A node with one direction only and therefore used as In-Line-Amplifier (ILA)

정답：A

설명：
A degree-1 node is a node that only has one direction, and it is therefore a terminal node. This means that the node only has one input and one output port. It does not have any other ports to connect to other nodes or fibers. This is a common feature of some optical transport networks, such as ring networks, where a degree-1 node serves as the endpoint of the ring.

질문 # 13
How is it possible to check the activation status of GMRE on a node?

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

정답：D

설명：
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.

질문 # 14
Which of the following statements about coherent transmission in WDM technology is TRUE?

A. Coherent systems need carrier phase information at the receiver.
B. Only multi-mode fibers can be used with coherent transmissions.
C. At each receiver, a dispersion compensation unit is often necessary, depending on the fiber length.
D. The channel allocation is flexible, according to the channel size of the signals.

정답：A

설명：
Comprehensive and Detailed Explanation From Nokia Optical Networking Fundamentals:
Coherent transmission represents a massive leap in optical technology, moving beyond simple "on-off keying" (Intensity Modulation) to more complex modulation formats like QPSK or 16-QAM. A fundamental requirement of a coherent receiver is the ability to recover and track the carrier phase information of the incoming signal. This is achieved by using a Local Oscillator (LO) laser at the receiver that interferes with the incoming signal, allowing the receiver to extract phase and polarization data.
Unlike legacy 10G direct-detection systems, coherent systems (like Nokia's PSE-V engine) perform Digital Signal Processing (DSP) to electronically compensate for impairments. This makes Option D false, as physical Dispersion Compensation Modules (DCMs) are actually detrimental and usually removed in coherent networks. Option B is incorrect as coherent transmission is designed for Single-Mode Fiber (SMF). Option C refers to Flex-grid technology; while coherent signals often use Flex-grid, the defining characteristic of coherent technology is the phase-sensitive detection at the receiver.

질문 # 15
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