合格させる4A0-265ブレーン問題集で更新されたのは認定サンプル問題
オンライン4A0-265テストブレーン問題集とテストエンジン
質問 # 22
Consider the exhibit. Given the following power readings, what is the calculated span loss from Node A to Node B?
- A. 2.5
- B. 11.5
- C. 1.5
- D. 8.0
正解：D
解説：
Explanation
The exhibit shows a diagram of a network with two nodes, Node A and Node B, connected by a fiber span.
The diagram also shows the power readings at different points of the span. The calculated span loss from Node A to Node B is the difference between the output power at Node A and the input power at Node B. According to the diagram, the output power at Node A is +3.5 dBm and the input power at Node B is -4.5 dBm.
Therefore, the span loss from Node A to Node B is 3.5 - (-4.5) = 8.0 dB.
質問 # 23
Suppose a Raman amplifier has been plugged into slot 1/8. Which command should the user enter to retrieve the total optical power detected at the ingress interface?
- A. show interface 1/8 power
- B. show interface 1/8/UNEIN detail
- C. show interface 1/8 opin
- D. show Interface 1/8/LINEIN
正解：B
解説：
Explanation
The command show interface 1/8/UNEIN detail is used to retrieve the total optical power detected at the ingress interface of a Raman amplifier. This command displays detailed information about the UNEIN interface, which is the unidirectional east input interface of the Raman amplifier. The total optical power detected at the UNEIN interface is shown as Input Power (dBm) in the output of this command1. References : Nokia Optical Diagnostics and Troubleshooting Course | Nokia
質問 # 24
Which of the following statements about using Nokia product documentation in the troubleshooting process is TRUE?
- A. Before investigating a problem it is important to check the User Provisioning Guide (UPG) if a possible issue has already been acknowledged by the Product Unit (PU).
- B. The Customer Release Notes (CRNs) document collects documented solved known issues, new issues discovered after the product software has been released.as well as software upgrade procedures and firmware details.
- C. The Customer Release Notes (CRNs) provides instructions to perform the automated provisioning, commissioning, and power balancing functions in a customer network based on the Nokia 1830 PS5 platform.
- D. Before investigating a problem it is important to check the Engineering and Planning Tool User Guide (EPTUG) if a possible issue has already been acknowledged by the Product Unit (PU).
正解：B
解説：
Explanation
The Customer Release Notes (CRNs) document collects documented solved known issues, new issues discovered after the product software has been released, as well as software upgrade procedures and firmware details. This document is useful for troubleshooting because it can help identify if a problem is related to a known issue or a software bug, and if there is a workaround or a solution available. The CRNs also provide information about the software compatibility and interoperability of different Nokia products and platforms.
The other options are incorrect because the EPTUG and the UPG do not contain information about known issues, and the CRNs do not provide instructions for automated provisioning, commissioning, and power balancing functions. References: Nokia Optical Diagnostics and Troubleshooting Course, Nokia Optical Diagnostics and Troubleshooting Exam
質問 # 25
Which of the following statements about the Wavelength Tracker (WT) capability is TRUE?
- A. Wave Keys are originated by optical amplifiers.
- B. WT uses a unique identifier based on a pair of numbers encoded by Optical Transponders OTs) into each service wavelength direction.
- C. WT is compatible with other vendor domains, but the user must make sure that Wave Keys are unique on the crossed domains.
- D. WT uses a unique identifier based on a pair of numbers encoded by Raman amplifiers into each service wavelength direction.
正解：B
解説：
Explanation
The statement that WT uses a unique identifier based on a pair of numbers encoded by Optical Transponders (OTs) into each service wavelength direction is TRUE. WT is a feature of the 1830 PSS that allows for automatic identification and tracking of wavelengths across different network elements and domains. WT uses Wave Keys, which are unique identifiers composed of two numbers: a Wave Key ID and a Wave Key Code. The Wave Key ID identifies the OT that generates the wavelength, while the Wave Key Code identifies the wavelength itself within a given OT6. The Wave Keys are encoded by OTs into each service wavelength direction using phase modulation, and can be decoded by other OTs or amplifiers that have WT capability.
WT enables various applications and benefits, such as simplified commissioning, automated wavelength routing, enhanced fault localization, and improved network security. References : Nokia Optical Diagnostics and Troubleshooting Course | Nokia, Optical User Guide - Nokia, Alcatel-Lucent 1830 PSS-8 and PSS-16 Photonic Service Switch
質問 # 26
Refer to the exhibit, which shows a conditions list from the 1830 PSS GUI. (i) What is the total number of alarms reported? (ii) How many service affecting alarms are displayed? (iii) How many conditions are displayed?
- A. (I) total number of alarms = 5
(ii) number of serviceaffectingalarms = 2
(Hi) number of conditions = 14 - B. (i) total number of alarms = 4
(ii) number of service affecting alarms = 14
(iii) number of conditions = 2 - C. (i) total number of alarms = 2
(ii) number of service affecting alarms = 2
(Hi) number of conditions = 18 - D. (i) total number of alarms = 7
(ii) number of service affecting alarms = 5
(Hi) number of conditions = 7
正解：D
解説：
Explanation
The exhibit shows a conditions list from the 1830 PSS GUI, which displays the alarms and events that occur on the network elements. The total number of alarms reported is equal to the number of rows that have a red or yellow icon in the Severity column, indicating a critical or major alarm. In this case, there are 7 rows with such icons, so the total number of alarms is 7. The number of service affecting alarms is equal to the number of rows that have a "Yes" valuein the Service Affecting column, indicating that the alarm affects the service quality or availability. In this case, there are 5 rows with such values, so the number of service affecting alarms is 5. The number of conditions is equal to the total number of rows in the table, regardless of their severity or service affecting status. In this case, there are 7 rows in the table, so the number of conditions is
7. References : Optical User Guide - Nokia, Security Target Nokia 1830 Photonic Service Switch (PSS)
質問 # 27
Which of the following statements about the alarm masking mechanism is TRUE?
- A. The alarm masking mechanism makes sure that alarms are always present on the downstream interfaces to facilitate the troubleshooting process.
- B. The alarm masking mechanism always forwards masked alarms to an external Network Management System (NMS) for alarm correlation.
- C. The alarm masking mechanism preserves the events' original time stamps, when related alarms gets hidden and then eventually displayed because of the mechanism itself, so that the user can still know the date and time of the original issue.
- D. The alarm masking mechanism updates the events' original time stamps when it masks/shows alarms, so that when an alarm is not masked anymore, the user can see the updated date and time associated with the original issue.
正解：C
解説：
Explanation
The alarm masking mechanism is a feature of the 1830 PSS that prevents unnecessary alarms from being displayed on the GUI or forwarded to an external NMS when they are caused by a known fault or maintenance activity. For example, if an optical link is down due to a fiber cut, there is no need to show alarms for all the downstream interfaces that are affected by the link failure. The alarm masking mechanism hides these alarms until the root cause is resolved, and then shows them again if they persist. The alarm masking mechanism preserves the events' original time stamps when it masks/shows alarms, so that when an alarm is not masked anymore, the user can see the original date and time associated with the issue. This helps to identify and troubleshoot problems more accurately and efficiently. References : Optical User Guide - Nokia, Alcatel-Lucent 1830 PSS-8 and PSS-16 Photonic Service Switch
質問 # 28
What is the typical severity level of a "Loss of Signal" (LOS) alarm?
- A. Critical
- B. Warning
- C. Minor
- D. Major
正解：A
解説：
Explanation
A "Loss of Signal" (LOS) alarm is a critical alarm that indicates that there is no or very bad signal at the physical interface. LOS alarm is also raised when the signal level drops below the threshold, at which a high bit error rate (BER) is predicted. LOS alarm can be caused by physical damage, power outage, or misconfiguration of the equipment. LOS alarm can affect the service availability and performance of the optical network. Therefore, it is typically assigned a critical severity level, which means that it requires immediate attention and resolution2. Other severity levels are major, minor, and warning, which indicate different degrees of impact and urgency of the alarms. References: Troubleshooting Guide for Cisco NCS
1002, T1: A Survival Guide, M-series SONET/SDH alarms and troubleshooting tips
質問 # 29
A "Power Adjustment Required" alarm was raised on the ingress amplifier in slot 1/10. Which of the following commands should be entered to manually adjust the related amplifier optical power levels?
- A. config powermgmt ingress 1/10 adjust
- B. config powermgmt ingress 1/10 scot
- C. config powermgmt ingress 1/10 power adjustment
- D. config powermgmt ingress 1/10
正解：A
解説：
Explanation
A "Power Adjustment Required" alarm is raised when the optical power levels of an amplifier are out of the expected range and need to be adjusted. To manually adjust the related amplifier optical power levels, the command config powermgmt ingress 1/10 adjust should be entered. This command will initiate a power adjustment process for the ingress amplifier in slot 1/10, which is the input port for the optical line signal. The command will also display the status and results of the power adjustment, such as success, failure, or conditional success. The other commands are incorrect because they either do not initiate a power adjustment process or have invalid syntax. References: Nokia Optical Diagnostics and Troubleshooting Course, OAM and Diagnostics Guide
質問 # 30
Consider the exhibit. Given the following power readings, what is the calculated span loss from Node A to Node B?
- A. 10.0 dB
- B. 5.0 dB
- C. 2.0 dB
- D. 8.0 dB
正解：A
解説：
Explanation
The calculated span loss from Node A to Node B is 10.0 dB. Span loss is the difference between the optical power transmitted and received at two points in a network. It can be calculated by subtracting the received power from the transmitted power. In the exhibit, the transmitted power from Node A to Node B is +7.5 dBm, and the received power at Node B from Node A is -2.5 dBm. Therefore, the span loss is +7.5 dBm - (-2.5 dBm) = 10.0 dB. The other options are incorrect because they do not match the calculation. References: Nokia Optical Diagnostics and Troubleshooting Course, Pluggable Optical Modules: Transceivers for the Cisco ONS Family Data Sheet
質問 # 31
Which of the following statements best describes the Forward Error Correction (FEC) technique?
- A. FEC enables errors to be detected and data to be retransmitted. This technique is effective only above a specified OSNR threshold.
- B. FEC enables errors to be detected and corrected without retransmission. This technique is effective only below a specified OSNR threshold.
- C. FEC enables errors to be detected and corrected without retransmission. This technique is effective only above a specified OSNR threshold.
- D. FEC enables errors to be detected and data to be retransmitted. This technique is effective only below a specified OSNR threshold.
正解：C
解説：
Explanation
The statement that best describes the Forward Error Correction (FEC) technique is C. FEC is a technique used in digital communication to improve the accuracy and reliability of data transmission. By adding redundant information to the transmitted data, FEC enables the receiver to detect and correct errors without retransmission or other error correction techniques11. FEC is effective only above a specified OSNR threshold, which is the minimum optical signal-to-noise ratio required for error-free transmission with FEC enabled. If the OSNR falls below this threshold, FEC cannot correct all errors and data quality degrades significantly. References : Nokia Optical Diagnostics and Troubleshooting Course | Nokia, Optical User Guide
- Nokia, Forward Error Correction (FEC) - Online Tutorials Library
質問 # 32
Which of the following correctly describes how a unidirectional amplification stage works?
- A. * Incoming optical signals are boosted by the ingress amplifier.
* Outgoing optical signals do not pass through the ingress amplifier. - B. * Incoming optical signals are boosted by the ingress amplifier.
* Outgoing optical signals are also boosted by the ingress amplifier. - C. * Incoming optical signals pass through the ingress amplifier but are not boosted.
* Outgoing optical signals are boosted by the ingress amplifier. - D. * Incoming optical signals are boosted by the ingress amplifier.
* Outgoing optical signals pass through the ingress amplifier but are not boosted.
正解：A
解説：
Explanation
A unidirectional amplification stage works by boosting the incoming optical signals by the ingress amplifier, while the outgoing optical signals do not pass through the ingress amplifier. This means that the ingress amplifier only amplifies the signals in one direction, hence the name unidirectional. This configuration is typically used for point-to-point links or ring networks where bidirectional amplification is not required or desired1. References : Nokia Optical Diagnostics and Troubleshooting Course | Nokia
質問 # 33
Which of the following statements best describes the output of the command: show xc 1?
- A. A list of all boards on all nodes that this cross-connection passes through, along with expected power levels, measured power levels, and allowed power deviations.
- B. A list of boards that this cross-connection passes through on the local node, along with administrative/operational states, expected power levels, and measured power levels.
- C. OCH trail name, ITU channel, administrative/operational states, protection states, and Wave Keys for both directions.
- D. A list of cross-connections, including A-end, Z-end, frequency, ID number, OCH trail name, and administrative/operational states.
正解：D
解説：
Explanation
The command show xc 1 displays a list of cross-connections, including A-end, Z-end, frequency, ID number, OCH trail name, and administrative/operational states. A cross-connection is a logical connection between two ports on an optical network element that allows the transmission of an optical signal from one port to another.
The command can be used to view the configuration and status of the cross-connections on a node or a network. The other options are incorrect because they either describe a different command or provide incorrect information. References: Nokia Optical Diagnostics and Troubleshooting Course, OAM and Diagnostics Guide
質問 # 34
Which of the following statements about the "config powermgmt egress 1/2 adjust status command" is TRUE?
- A. The command enables power adjustment feature on the specified egress amplifier, as this feature Is always and only available at the egress amplification stage.
- B. The command enables power adjustment feature on the specified egress amplifier.
- C. The command displays the status of power adjustment on the specified egress amplifier.
- D. The command displays commissioning status and WT decoder usage for the specified egress amplifiers only, as this feature is always and only done in the egress direction.
正解：B
解説：
Explanation
The command config powermgmt egress 1/2 adjust status is used to enable or disable the power adjustment feature on the specified egress amplifier. The power adjustment feature is a function that automatically adjusts the output power of an amplifier to compensate for changes in the input power or the number of channels. This feature can be enabled or disabled on both ingress and egress amplifiers, depending on the network configuration and requirements1. Therefore, the statement C is true. References : Nokia Optical Diagnostics and Troubleshooting Course | Nokia
質問 # 35
Which of the following statements about optical power vs amplification stages is TRUE?
- A. When channels pass through amplifiers, all of them always experience a similar amplification.
- B. Ingress amplifiers are always more powerful [than egress amplifiers, to reduce the impact of non-linear effects.
- C. The Optical Supervisory Channel (OSC) is amplified when passing through all amplifier types, except for Raman which is not based on EDFA.
- D. When multiple channels pass through a shared port (for example, an amplifier line interface), the total aggregated power reflects the number of channels currently present.
正解：D
解説：
Explanation
The statement that when multiple channels pass through a shared port (for example, an amplifier line interface), the total aggregated power reflects the number of channels currently present is TRUE. This means that the more channels are present, the higher the total output power will be, and vice versa. This is because each channel contributes to the total power by its own power level, and the amplifier tries to maintain a constant gain for each channel2. Therefore, the total output power depends on both the input power and the number of channels3. References : Nokia Optical Diagnostics and Troubleshooting Course | Nokia, Optical amplifiers, explained by RP; optical amplification, Amplifier chains, explained by RP; amplifier stages, preamplifier ...
質問 # 36
Which of the following statements correctly describes where power adjustments can be performed?
- A. In unidirectional configurations, both ingress and egress power adjustments are performed against the ingress amplifiers only.
- B. In bidirectional configurations, ingress power adjustments are performed against the ingress amplifiers, while egress power adjustments are performed against the egress amplifiers.
- C. When Raman pumps are used, both ingress and egress power adjustments are performed against the Raman pump directly.
- D. In bidirectional configurations, both ingress and egress power adjustments are performed against the ingress amplifiers only.
正解：B
解説：
Explanation
In bidirectional configurations, where the same fiber is used to transmit signals in both directions, power adjustments can be performed at both ingress and egress amplifiers. The ingress power adjustments are performed against the ingress amplifiers, which boost the incoming signals from the opposite direction. The egress power adjustments are performed against the egress amplifiers, which boost the outgoing signals from the same direction2. Therefore, the statement A is correct. References : Nokia Optical Diagnostics and Troubleshooting Course | Nokia, Optical amplifiers, explained by RP; optical amplification
質問 # 37
Which of the following statements best describes the output of the CLI command: show wavekey wtmonitor
1/6/LINE summary?
- A. A list of the unexpected channels detected against the selected interface.
- B. A list of all channels detected against the selected interface, including Wave Keys pair, channel status, expected and measured power, allowed deviation, and tolerance.
- C. A list of all channels detected against the selected interface (in and out); it shows if a Wave Keys pair is expected, if a Wave Keys pair is received, and if the received Wave Keys pair is unexpected.
- D. A list of all channels on this interface for which any Wave Keys pair is being received.
正解：C
解説：
Explanation
The command show wavekey wtmonitor 1/6/LINE summary displays a list of all channels detected against the selected interface (in and out); it shows if a Wave Keys pair is expected, if a Wave Keys pair is received, and if the received Wave Keys pair is unexpected. A Wave Keys pair is a pair of unique identifiers that are transmitted along with an optical channel to provide channel identification and monitoring functions. The command can be used to verify the presence and correctness of the Wave Keys pairs on an interface and to detect any mismatch or misconfiguration. The other options are incorrect because they either describe a different command or provide incorrect information. References: Nokia Optical Diagnostics and Troubleshooting Course, OAM and Diagnostics Guide
質問 # 38
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