Updated PDF (New 2024) Actual Nokia 4A0-265 Exam Questions
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NEW QUESTION # 12
Consider the exhibit. What do the different colored green columns indicate?
- A. Optical power levels measured at different interfaces throughout the optical path of a single wavelength.
- B. Optical power levels measured for multiple wavelengths against a specific interface.
- C. Optical power levels measured multiple times against a specific interface, at 24-hour intervals for the same wavelength.
- D. The average optical power levels measured for multiple wavelengths throughout their shared optical path.
Answer: A
Explanation:
Explanation
The exhibit shows a graph of optical power levels measured at different interfaces throughout the optical path of a single wavelength. The different colored green columns indicate the optical power levels at different points along the optical path, such as the transmitter, the receiver, and the amplifiers. The graph also shows the expected power levels and the allowed deviation range for each point. The graph can be used to monitor the performance and quality of the optical signal and to identify any potential issues or anomalies. The other options are incorrect because they either describe a different type of graph or do not match the exhibit. References: Nokia Optical Diagnostics and Troubleshooting Course, OAM and Diagnostics Guide
NEW QUESTION # 13
Which of the following statements correctly describes where power adjustments can be performed?
- A. In bidirectional 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. In unidirectional configurations, both ingress and egress power adjustments are performed against the ingress amplifiers only.
- D. When Raman pumps are used, both ingress and egress power adjustments are performed against the Raman pump directly.
Answer: B
Explanation:
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
NEW QUESTION # 14
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
Answer: D
Explanation:
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)
NEW QUESTION # 15
Which of the following statements best describes the output of the command: show xc 1?
- A. 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.
- B. OCH trail name, ITU channel, administrative/operational states, protection states, and Wave Keys for both directions.
- C. 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.
- D. A list of cross-connections, including A-end, Z-end, frequency, ID number, OCH trail name, and administrative/operational states.
Answer: D
Explanation:
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
NEW QUESTION # 16
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. 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).
- D. 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.
Answer: B
Explanation:
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
NEW QUESTION # 17
Which of the following statements about optical power vs amplification stages is TRUE?
- A. Ingress amplifiers are always more powerful [than egress amplifiers, to reduce the impact of non-linear effects.
- B. 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.
- C. When channels pass through amplifiers, all of them always experience a similar amplification.
- D. The Optical Supervisory Channel (OSC) is amplified when passing through all amplifier types, except for Raman which is not based on EDFA.
Answer: B
Explanation:
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 ...
NEW QUESTION # 18
Consider the exhibit.
Which type of loopback is applied?
- A. Line port facility Ioopback
- B. Client port facility loopback
- C. Client port terminal Ioopback
- D. Line port terminal Ioopback
Answer: C
Explanation:
Explanation
The exhibit shows a diagram of an OT module with a client port and a DWDM port. The client port is looped back to itself with an OEO (Optical-Electrical-Optical) device. This means that the signal received by the client port is converted to an electrical signal, then back to an optical signal, and then transmitted back to the same port. This type of loopback is called a client portterminal loopback. It is used to test the functionality of the client port without involving the DWDM port or any other network element4. A client port facility loopback would involve looping back the signal from the DWDM port to the client port. A line port facility loopback would involve looping back the signal from another OT module or network element to the DWDM port. A line port terminal loopback would involve looping back the signal from the DWDM port to itself5. References : Nokia Optical Diagnostics and Troubleshooting Course | Nokia, Loopback - Wikipedia
NEW QUESTION # 19
Consider the exhibit which shows part of an EPT Schematic View. Which number refers to the Wavelength Router (WR8-88) block?
- A. 0
- B. 1
- C. 2
- D. 3
- E. 4
Answer: D
Explanation:
Explanation
The Wavelength Router (WR8-88) block is a device that can route optical signals based on their wavelengths.
It can also perform wavelength conversion, multiplexing, and demultiplexing functions. The Wavelength Router (WR8-88) block is part of the Nokia 1830 PSS-8x platform, which is optimized for metro aggregation switching applications in optical transport networks1. In the exhibit, the number 1 refers to the Wavelength Router (WR8-88) block, as indicated by the label WR8-88AF. The other numbers refer to different components of the system, such as transponders, amplifiers, and switches. References: Nokia Optical Diagnostics and Troubleshooting Course, DWDM 1830 PSS-8 WR8-88AF Board
NEW QUESTION # 20
Suppose a node is experiencing a little unexpected attenuation over the Optical Supervisory Channel (OSC) transmit direction. Which of the following statements is FALSE?
- A. Traffic will pass between the local and adjacent node.
- B. A "Data Link Down" alarm will raise on the adjacent node.
- C. A Power adjustments action will fail on the local node.
- D. No OSC-related alarms will raise on the local node.
Answer: D
Explanation:
Explanation
The statement that is false is that no OSC-related alarms will raise on the local node. OSC stands for Optical Supervisory Channel, which is a dedicated wavelength used for out-of-band signaling and management of optical network elements. If a node is experiencing a little unexpected attenuation over the OSC transmit direction, it means that the OSC signal is weaker than expected when it reaches the adjacent node. This can cause a "Data Link Down" alarm to raise on the adjacent node, indicating that the OSC communication link is broken or degraded. However, this can also cause an "OSC Power Low" alarm to raise on the local node, indicating that the OSC transmit power is below the threshold. Therefore, there will be OSC-related alarms on both nodes. The other statements are true because a power adjustment action will fail on the local node due to insufficient OSC power, and traffic will pass between the nodes as long as there is no other issue affecting the data channels. References: Nokia Optical Diagnostics and Troubleshooting Course, Optical Supervisory Channel Module product data sheet
NEW QUESTION # 21
Which of the following statements about the Wavelength Tracker (WT) capability is TRUE?
- A. WT is compatible with other vendor domains, but the user must make sure that Wave Keys are unique on the crossed domains.
- B. WT uses a unique identifier based on a pair of numbers encoded by Optical Transponders OTs) into each service wavelength direction.
- C. Wave Keys are originated by optical amplifiers.
- D. WT uses a unique identifier based on a pair of numbers encoded by Raman amplifiers into each service wavelength direction.
Answer: B
Explanation:
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
NEW QUESTION # 22
Which of the following statements about the "config powermgmt egress 1/2 adjust status command" is TRUE?
- A. 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.
- B. The command enables power adjustment feature on the specified egress amplifier, as this feature Is always and only available at the egress amplification stage.
- C. The command displays the status of power adjustment on the specified egress amplifier.
- D. The command enables power adjustment feature on the specified egress amplifier.
Answer: D
Explanation:
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
NEW QUESTION # 23
Consider the exhibit which shows an EPT Power ManagementReport for an ingress amplifier.
What is the available output optical power range?
- A. -0.6 to 1.72 dB
- B. 0.56 to 1.14 dB
- C. 0.56 to 1.72 dB
- D. -0.02 to 1.14 dB
Answer: A
Explanation:
Explanation
The available output optical power range is the difference between the maximum gain and the minimum gain range of the ingress amplifier. According to the EPT Power Management Report, the maximum gain is 25.7 dB and the minimum gain range is 14 dB. Therefore, the available output optical power range is 25.7 - 14 =
11.7 dB. To convert this to a logarithmic scale, we use the formula 10^(x/10), where x is the value in dB.
Therefore, the available output optical power range in logarithmic scale is 10^(11.7/10) - 10^(14/10) = 14.68 -
25.12 = -0.6 to 1.72dB. References : Nokia Optical Diagnostics and Troubleshooting Course | Nokia, EPT Power Management Report | Nokia
NEW QUESTION # 24
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 below a specified OSNR threshold.
- B. FEC enables errors to be detected and data to be retransmitted. This technique is effective only above 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 corrected without retransmission. This technique is effective only below a specified OSNR threshold.
Answer: C
Explanation:
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
NEW QUESTION # 25
Which of the following is NOT a characteristic of an Optical Supervisory Channel Loss of Signal (OSC LOS) issue, in case that no "LD Input LOS" alarms are raised against the involved amplifiers?
- A. A "Data Link Down" alarm is raised on the adjacent node.
- B. Traffic does not pass between the local and adjacent nodes.
- C. A "Power Adjustment Required" alarm is eventually raised on the local node.
- D. An "Incoming SUPVY LOS" alarm is raised on the local node.
Answer: D
Explanation:
Explanation
The statement that an "Incoming SUPVY LOS" alarm is raised on the local node is NOT a characteristic of an Optical Supervisory Channel Loss of Signal (OSC LOS) issue, in case that no "LD Input LOS" alarms are raised against the involved amplifiers. An "Incoming SUPVY LOS" alarm indicates that the input signal of the Optical Supervisory Channel (OSC) is lost or below the threshold6. The OSC is a bidirectional channel that connects two adjacent nodes in a DWDM network and carries OAM information and other services7. An OSC LOS issue can occur due to a fiber cut, a defective or dirty OSC fiber, or a faulty OSC transmitter or receiver8. However, if there is no "LD Input LOS" alarm raised against the involved amplifiers, it means that there is no loss of signal on the line interface of the amplifier, which carries both service channels and OSC channels9. Therefore, an "Incoming SUPVY LOS" alarm on the local node is not related to an OSC LOS issue, but rather to an OSC configuration issue or a faulty OSC card10. References : Nokia Optical Diagnostics and Troubleshooting Course | Nokia, Optical User Guide - Nokia, Alcatel-Lucent 1830 PSS-8 and PSS-16 Photonic Service Switch
NEW QUESTION # 26
Suppose a unidirectional amplifier has been plugged into slot 1/13. Which command should the user enter to retrieve the OSC pluggable module type?
- A. show interface 1/13/OSCSFP
- B. show interface 1/13/OSC detail
- C. show interface 1/13/OSCSFP detail
- D. show interface 1/13/OSC
Answer: C
Explanation:
Explanation
The command that the user should enter to retrieve the OSC pluggable module type is show interface
1/13/OSCSFP detail. This command will display detailed information about the OSC interface on slot 1/13, including the type of pluggable module that is installed in it. The pluggable module type can be either SFP or SFP+, depending on the speed and distance requirements of the OSC link. The command will also show other parameters, such as wavelength, frequency, transmit power, receive power, and status. The other commands are incorrect because they either do not show the pluggable module type or have invalid syntax. References: Nokia Optical Diagnostics and Troubleshooting Course, OSFP OCTAL SMALL FORM FACTOR PLUGGABLE MODULE
NEW QUESTION # 27
What is the typical severity level of a "Loss of Signal" (LOS) alarm?
- A. Critical
- B. Major
- C. Warning
- D. Minor
Answer: A
Explanation:
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
NEW QUESTION # 28
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