オールインワンタイプの4A0-205参考書＆問題集

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Nokia 4A0-205 認定試験の出題範囲：

トピック	出題範囲
トピック 1	Basics of the Network Management System Introduction to WDM networks
トピック 2	OTN hierarchy, trails, and services switching Network creation, analysis, and reporting
トピック 3	Foundation of survivability and availability Basics of Optical Network Design
トピック 4	SWDM (photonic and switched) nodes SWDM nodes supervision on NFM-T

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Nokia Optical Networking Fundamentals 認定 4A0-205 試験問題 (Q14-Q19):

質問 # 14
Is it possible to open and manage EPT designs that are created with different releases than the release installed on the local workstation?

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

正解：C

解説：
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.

質問 # 15
Which statement is correct about node synchronization?

A. Full synchronization retrieves all items from the node (NE parameters. Ports, Alarms, Internal Links, etc)
B. Full synchronization retrieves the correlated alarms from the node
C. Node synchronization is executed to test the reachability of a node
D. Node synchronization is executed to align the time of the node to the time of the NFM-T platform

正解：A

解説：
Node synchronization is a process of keeping the NFM-T database in sync with the nodes in the network. The synchronization process will download all the items from the node, including NE parameters, ports, alarms, internal links, etc., to the NFM-T database. This ensures that the NFM-T database is up to date and the network is running efficiently.

質問 # 16
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 within the node internally to recover internal losses due, for instance, to cascaded filters.
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 at the receiver side after it travels along the fiber from another node.

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 # 17
In which of the following forms does the TTI byte provide information on network elements?

A. Source and destination MAC addresses
B. Source and destination time-slot identifiers
C. Source (SAPI) and Destination (DAPI) Access Point Identifiers
D. Source and destination IP addresses and overhead

正解：C

解説：
Comprehensive and Detailed Explanation From Nokia Optical Networking Fundamentals:
In the Optical Transport Network (OTN) hierarchy, the TTI (Trail Trace Identifier) is a 64-byte overhead signal used to ensure that the source and destination of a path are correctly connected. It is part of the overhead in the OTU (Optical Transport Unit) and ODU (Optical Data Unit) layers. The TTI provides a mechanism for "path trace" to prevent misconnections. It specifically carries the SAPI (Source Access Point Identifier) and the DAPI (Destination Access Point Identifier).
These identifiers are strings that uniquely identify the source and destination ports. By comparing the "Expected SAPI/DAPI" configured on a port with the "Received SAPI/DAPI" actually coming in over the fiber, the Nokia 1830 PSS can detect fiber patching errors or cross-connect mistakes. If there is a mismatch, the system can trigger a TIM (Trace Identifier Mismatch) alarm and potentially squelch the traffic to prevent data from being delivered to the wrong customer. This is a Layer 1 (OTN) function and is entirely independent of Layer 2 MAC addresses or Layer 3 IP addresses used by the management system for DCN (Data Communication Network) connectivity.

質問 # 18
Is it possible to modify node parameters within the edit EPT menu?

A. No, this view is used to display a close-up view of the node
B. Yes, the user can apply manual changes but only for non-GMPLS nodes, as the control plane reserves node resources not editable by the user
C. Yes, the user can apply manual changes directly from this view
D. Yes, but the user can modify only the node name and location

正解：B

解説：
Yes, the user can apply manual changes but only for non-GMPLS nodes, as the control plane reserves node resources not editable by the user. The edit EPT menu allows the user to view information about a node but is not used to modify node parameters. The user can only apply manual changes to non-GMPLS nodes, as the control plane reserves node resources which cannot be modified by the user.

質問 # 19
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