実際的-素敵な4A0-205ファンデーション試験-試験の準備方法4A0-205認定試験

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Nokia Optical Networking Fundamentals 認定 4A0-205 試験問題 (Q61-Q66):

質問 # 61
What is the OAMP LAN interface?

A. It is an RJ-45 interface (a common Ethernet port) used to export active alarms to an external device, typically equipped with several LEDs
B. It is an RJ-45 interface (a common Ethernet port) that has to be configured with an IP address for node reachability and management
C. It is an RJ-45 interface (common Ethernet port) used to connect one or more client ports (e.g., 1Gb/s or legacy 100Mbit/s client flows)
D. It is an RJ-45 interface (a common Ethernet port) used for cascading 1830 PSS nodes (e.g., external shelves)

正解：B

解説：
It is an RJ-45 interface (a common Ethernet port) that has to be configured with an IP address for node reachability and management. This interface is used to connect the OAMP node to the LAN, allowing it to be managed and monitored remotely.

質問 # 62
When monitoring the quality of the received signal in WDM, an open eye indicates:

A. Presence of high inter-symbolic interference
B. High jitter
C. High distortion
D. Low noise

正解：D

解説：
An open eye pattern indicates that the signal is not affected by noise, and the received signal is of high quality. This is because an open eye pattern is the result of a signal that is aligned in time, and is not affected by noise or other distortions.
Reference:
"Optical Fiber Communications" by Gerd Keiser
"Fiber-Optic Communications Technology" by Djafar K. Mynbaev
"Optical Communications" by Gerd Keiser

質問 # 63
Which of the following are the main reasons for fiber attenuation?

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

正解：C

解説：
Scattering and absorption are the main reasons for fiber attenuation. Scattering occurs when light bounces off the sides of the fiber, while absorption happens when light is absorbed by the glass or other materials that make up the fiber. Chromatic dispersion (CD) and polarization mode dispersion (PMD) are also factors that can cause attenuation, but they are not the main causes. Small channel spacing can also cause attenuation, but it is a secondary factor and is only significant in certain cases.

質問 # 64
What is the purpose of the NFM-T node synchronization?

A. The partial or full node synchronization allows several entities/items defined at node level to be retrieved into the NFM-T database (upload).
B. The partial or full node synchronization allows several entities/items defined at NFM-T level to be written into the node database (download).
C. 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).
D. 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).

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 # 65
Which of the following sentences about FlexGrid is false?

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

正解：D

解説：
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

質問 # 66
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