[2024] Free 4A0-265 Exam Dumps to Pass Exam Easily
4A0-265 Exam Dumps, 4A0-265 Practice Test Questions
Nokia 4A0-265 exam is a certification exam that is designed for professionals in the field of optical diagnostics and troubleshooting. 4A0-265 exam is specifically focused on the Nokia Optical Network Management with NFM-T software and the Nokia 1830 Photonic Service Switch (PSS) system. 4A0-265 exam covers topics such as network element management, network element configuration, network element data collection, fault management, and performance management.
NEW QUESTION # 21
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. 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.
- 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.
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 # 22
What is the default severity level for a Threshold Crossing Alert (TCA) alarm?
- A. Warning
- B. Major
- C. Critical
- D. Minor
Answer: A
Explanation:
Explanation
A Threshold Crossing Alert (TCA) alarm is a type of alarm that indicates that a monitored parameter has crossed a predefined threshold. For example, a TCA alarm can be triggered when the optical power received at a port is too high or too low. The default severity level for a TCA alarm is warning, which means that it does not affect the service but may require attention. The other severity levels are critical, major, and minor, which indicate different degrees of impact and urgency of the alarms. The severity level of a TCA alarm can be changed by the user using the Nokia 1830 Engineering and Planning Tool (EPT) or the Nokia 1350 Optical Management System (OMS). References: Nokia Optical Diagnostics and Troubleshooting Course, Nokia 1830 PSS-32 and PSS-16 Photonic Service Switch Release 8.0 Alarms and Conditions Reference Guide
NEW QUESTION # 23
Which of the following is a passive component in a CDC-F network configuration?
- A. IRDM20 Integrated ROADM
- B. MSH4-FSB Fiber Shuffle Module
- C. WR20-TFM Wavelength Router
- D. 130SCX10 Optical Transponder
Answer: B
Explanation:
Explanation
A passive component in a CDC-F network configuration is the MSH4-FSB Fiber Shuffle Module. This module is used to rearrange the fibers between the CDC-F modules and the wavelength routers, so that each wavelength router can access any of the 96 wavelengths in the C-band. The MSH4-FSB module does not require any power or active components, and it does not perform any optical amplification or switching2. References : Nokia Optical Diagnostics and Troubleshooting Course | Nokia, Nokia 1830 Photonic Service Switch (PSS) | Nokia
NEW QUESTION # 24
Which of the following statements about using Nokia product documentation in the troubleshooting process is TRUE?
- A. 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.
- B. 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.
- 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. 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).
Answer: A
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 # 25
Suppose a "Channel Absent" alarm is reported on an 1830 PSS node. What is the recommended order for the following troubleshooting steps?
- A. 1. Retrieve the cross-connection (XC) details and see what virave Keys should be present.
2. Go to the suspected troubled node / card / port and look at Wave Keys (in / out).
3. Retrieve the channel power trace.
4. Check observed Wave Keys against expected Wave Keys. - B. 1. Go to the suspected troubled node / card / port and look at Wave Keys (in / out).
2. Retrieve the cross-connection (XC) details and see what Wave Keys should be present.
3. Check observed Wave Keys against expected Wave Keys.
4. Retrieve the channel power trace. - C. 1. Check observed Wave Keys against expected Wave Keys.
2. Go to the suspected troubled node / card / port and look at Wave Keys (in / out).
3. Retrieve the channel power trace.
4. Retrieve the cross-connection (XC) details and see what Wave Keys should be present. - D. 1. Retrieve the channel power trace.
2. Retrieve the cross-connection (XC) details and see what Wave Keys should be present.
3. Go to the suspected troubled node / card / port and look at Wave Keys (in / out).
4. Check observed Wave Keys against expected Wave Keys.
Answer: D
Explanation:
Explanation
The recommended order for the troubleshooting steps is B, as follows:
* Retrieve the channel power trace. This step is useful to identify the affected channel and its power level, as well as to check if there are any fluctuations or anomalies in the power trace that could indicate a channel absent issue1.
* Retrieve the cross-connection (XC) details and see what Wave Keys should be present. This step is necessary to verify which Wave Keys are expected to be present on the node, card, and port based on the XC configuration2. Wave Keys are unique identifiers for wavelength tracking that are encoded by Optical Transponders (OTs) into each service wavelength direction3.
* Go to the suspected troubled node / card / port and look at Wave Keys (in / out). This step is helpful to compare the observed Wave Keys with the expected Wave Keys, and to locate the source of the problem. If a Wave Key is missing or mismatched, it means that there is a channel absent issue on that node, card, or port4.
* Check observed Wave Keys against expected Wave Keys. This step is the final solution to resolve the issue and restore the normal operation of the node. The observed Wave Keys should match the expected Wave Keys based on the XC configuration. If not, the XC configuration should be corrected or the faulty node, card, or port should be replaced5. 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
Which of the following statements about the alarm masking mechanism is TRUE?
- A. 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.
- B. The alarm masking mechanism makes sure that alarms are always present on the downstream interfaces to facilitate the troubleshooting process.
- C. The alarm masking mechanism always forwards masked alarms to an external Network Management System (NMS) for alarm correlation.
- 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.
Answer: A
Explanation:
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
NEW QUESTION # 27
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, both ingress and egress power adjustments are performed against the ingress amplifiers only.
- C. In bidirectional configurations, ingress power adjustments are performed against the ingress amplifiers, while egress power adjustments are performed against the egress amplifiers.
- D. When Raman pumps are used, both ingress and egress power adjustments are performed against the Raman pump directly.
Answer: C
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 # 28
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 Power adjustments action will fail on the local node.
- C. No OSC-related alarms will raise on the local node.
- D. A "Data Link Down" alarm will raise on the adjacent node.
Answer: C
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 # 29
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 # 30
Which of the following CLI commands displays a list of the expected and measured output power for the channels whose admin state is up?
- A. config wavekey summary
- B. show wavekey wtsource
- C. show wavekey wtsource power
- D. config wavekey power detail
Answer: C
Explanation:
Explanation
The command show wavekey wtsource power displays a list of the expected and measured output power for the channels whose admin state is up. This command is useful to monitor the power levels of the channels that are encoded with Wave Keys, which are unique identifiers for wavelength tracking. The command output shows the channel number, wavelength, Wave Key ID, Wave Key Code, expected output power, measured output power, and power difference for each channel1. The command can be used on both OTs and amplifiers that support WT capability2. References : Nokia Optical Diagnostics and Troubleshooting Course | Nokia, Optical User Guide - Nokia
NEW QUESTION # 31
Which of the following statements best describes the output of the CLI command: show wavekey wtmonitor
1/6/LINE summary?
- A. A list of all channels detected against the selected interface, including Wave Keys pair, channel status, expected and measured power, allowed deviation, and tolerance.
- B. A list of the unexpected channels detected against the selected interface.
- 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.
Answer: C
Explanation:
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
NEW QUESTION # 32
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 commissioning status and WT decoder usage for the specified egress amplifiers only, as this feature is always and only done in the egress direction.
- D. The command displays the status of power adjustment on the specified egress amplifier.
Answer: B
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 # 33
Which of the following Performance Measurement (PM) type is NOT typically retrieved at an Optical Transponder (OT) line interface?
- A. Optical Power Received (OPR)
- B. Ethernet collision counters
- C. Forward Error Correction - Errors Counted (FEC-EC)
- D. Digital Wrapper (DW)
Answer: B
Explanation:
Explanation
Performance Measurement (PM) is a feature that collects and reports various statistics related to the performance of an optical network element. PM data can be retrieved at different levels, such as Optical Channel (OCh), Optical Channel Data Unit (ODU), Optical Channel Transport Unit (OTU), and Ethernet. An Optical Transponder (OT) is a device that converts an electrical signal into an optical signal and vice versa. An OT has two interfaces: a client interface and a line interface. The client interface connects to the service provider network, while the line interface connects to the optical transport network. At the OT line interface, PM data can be retrieved for the OCh, ODU, OTU, and Digital Wrapper (DW) levels. The DW is a layer that encapsulates the client signal and provides overhead information for monitoring and management purposes.
Ethernet collision counters are not typically retrieved at the OT line interface, as they are related to the Ethernet level, which is usually monitored at the client interface. References: Nokia Optical Diagnostics and Troubleshooting Course, Nokia 1830 PSS-32 and PSS-16 Photonic Service Switch Release 8.0 Performance Monitoring Reference Guide
NEW QUESTION # 34
Which of the following issues can cause a "Loss too low" message to be displayed after a power adjustment has been provided?
- A. Unstable optical power levels
- B. An incorrect EPT network design
- C. A defective WSS unit
- D. A dirty fiber connector
Answer: A
Explanation:
Explanation
A "Loss too low" message can be displayed after a power adjustment has been provided if there is an issue with unstable optical power levels. Unstable optical power levels can be caused by various factors, such as environmental conditions, fiber aging, equipment malfunction, or configuration errors. Unstable optical power levels can affect the accuracy and reliability of the power adjustment process, which relies on measuring the optical loss between two points in the network. A "Loss too low" message means that the measured optical loss is lower than the expected value, which can indicate a problem with the optical signal quality or integrity.
The other issues are incorrect because they either cause a different type of message or do not affect the power adjustment process. References: Nokia Optical Diagnostics and Troubleshooting Course, OAM and Diagnostics Guide
NEW QUESTION # 35
Consider the exhibit. Given the following power readings, what is the calculated span loss from Node A to Node B?
- A. 11.5
- B. 2.5
- C. 8.0
- D. 1.5
Answer: C
Explanation:
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.
NEW QUESTION # 36
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 # 37
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Nokia 4A0-265 exam is a vendor-neutral certification that is recognized worldwide. It is an excellent option for professionals who want to expand their knowledge and skills in optical diagnostics and troubleshooting. With this certification, candidates can demonstrate their expertise to employers and clients, and gain a competitive advantage in the telecommunications industry. Additionally, the Nokia 4A0-265 certification is a valuable credential for professionals who want to advance their careers in optical networking and related fields.
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