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최신 Nokia Optical Network Professional 4A0-205 무료샘플문제 (Q45-Q50):

질문 # 45
Which of the following are the main reasons for fiber attenuation?

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

정답：B

질문 # 46
Which of the following sentences about FlexGrid is false?

A. The FlexGrid is currently standardized by ITU-T.
B. Channels in FlexGrid systems are allocated with a granularity of 27.5GHz.
C. FlexGrid systems use specific sets of boards. Old generation WDM systems need to be upgraded to support FlexGrid.
D. FlexGrid allows a more efficient channel spacing.

정답：C

설명：
FlexGrid is a flexible grid technology that allows for variable channel spacing and bandwidth allocation. It uses the same sets of boards as the traditional fixed grid systems and it does not require upgrading the old generation WDM systems.
Reference:
"Flexible Grid Optical Networks: From Concepts to Realizations" by Diomidis S. Michalopoulos and George K. Karagiannidis
"Flexible Grid and Flexible Spectrum Optical Networks" by Diomidis S. Michalopoulos and George K. Karagiannidis
"Flexible Grid Optical Networks" by Diomidis S. Michalopoulos and George K. Karagiannidis

질문 # 47
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 optical signal power (including noise) and the optical noise power over a specific spectral bandwidth.
C. 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.
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.

정답：D

설명：
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).

질문 # 48
Is it possible to open and manage EPT designs that are created with different releases than the release installed on the local workstation?

A. Only designs created with current and older releases can be opened and edited.
B. Designs created with an older release can be opened by a current release but cannot make changes.
C. No restrictions are imposed on the software release.
D. Only designs created with the current release can be opened and edited.

정답：A

설명：
It is possible to open and manage EPT designs that are created with different releases than the release installed on the local workstation, however only designs created with current and older releases can be opened and edited. Designs created with an older release can be opened by a current release but changes cannot be made.

질문 # 49
By using the EPT run design command, are the previously designed elements removed?

A. It depends, the user is prompted to choose whether to delete or leave the previously designed elements.
B. Not the design is always progressive, on top of the previous design.
C. Yes, although this is not happening in case of GMPLS-enabled nodes because existing slots cannot change as they are controlled by another manager (GMRE).
D. Yes, they are but only the first time the command is launched as - for future design phases - the existing packs need to keep the same slotting.

정답：A

설명：
The EPT run design command can remove previously designed elements, but the user is prompted to choose whether to delete them or leave them intact. This allows the user to progress their design while still keeping the existing elements in place. If the user selects to leave the existing elements, then they will remain in the same slots. If GMPLS nodes are used, the existing slots cannot change as they are controlled by another manager (GMRE).

질문 # 50
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