Download Online VALID 4A0-265 Exam Dumps File Instantly[Jan 06, 2024]
4A0-265 Exam Dumps For Certification Exam Preparation
NEW QUESTION # 24
Which of the following Performance Measurement (PM) type is NOT typically retrieved at an Optical Transponder (OT) line interface?
- A. Digital Wrapper (DW)
- B. Ethernet collision counters
- C. Forward Error Correction - Errors Counted (FEC-EC)
- D. Optical Power Received (OPR)
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 # 25
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 corrected without retransmission. This technique is effective only below a specified OSNR threshold.
- C. FEC enables errors to be detected and data to be retransmitted. 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 above a specified OSNR threshold.
Answer: D
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 # 26
Suppose a network operator needs to configure the 10GbE client interface 1/7/C1 with a GFP-F encapsulation mode. Which command should be used?
- A. config encmode interface 1/7/C1 10client gfp-f
- B. config encmode interface 1/7/C1 tenGige gfp-f
- C. config interface 1/7/C1 tenGige encmode gfp-f
- D. config interface 1/7/C1 encmode 10client gfp-f
Answer: D
Explanation:
Explanation
The command that should be used to configure the 10GbE client interface 1/7/C1 with a GFP-F encapsulation mode is config interface 1/7/C1 encmode 10client gfp-f. This command will set the encapsulation mode of the interface to GFP-F, which is a frame-mapped generic framing procedure that encapsulates Ethernet frames with a GFP header. The command also specifies that the interface is a 10GbE client interface, which means that it supports 10 Gigabit Ethernet LAN signals. The other commands are incorrect because they either have invalid syntax or use incorrect parameters for the interface or the encapsulation mode. References: Nokia Optical Diagnostics and Troubleshooting Course, OAM and Diagnostics Guide
NEW QUESTION # 27
Which of the following statements about using Nokia product documentation in the troubleshooting process is TRUE?
- A. 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.
- B. 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).
- C. 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.
- 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: C
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 # 28
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. OCH trail name, ITU channel, administrative/operational states, protection states, and Wave Keys for both directions.
- C. 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.
- 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 # 29
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 on this interface for which any Wave Keys pair is being received.
- D. 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.
Answer: D
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 # 30
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 # 31
Consider the exhibit. A single directional fiber cut is occurring between two amplifiers in unidirectional configuration with Raman pump.
Multiple services are crossing the affected span.
Which node(s) will report an Incoming Payload LOS" alarm?
- A. Both Node A and Node C
- B. Neither Node A nor Node C.
- C. Node C only.
- D. No node, as a Raman pump is used in Node A.
Answer: A
Explanation:
Explanation
A single directional fiber cut is occurring between two amplifiers in unidirectional configuration with Raman pump. Multiple services are crossing the affected span. The node(s) that will report an Incoming Payload LOS alarm are both Node A and Node C. An Incoming Payload LOS alarm indicates that there is no or very low signal at the input port of a node. In the exhibit, Node A will report this alarm because it will not receive any signal from Node B due to the fiber cut. Node C will also report this alarm because it will not receive any signal from Node D due to the fiber cut. The Raman pump in Node A does not prevent this alarm, as it only amplifies the signal in the forward direction, not the backward direction. The other options are incorrect because they either ignore one of the nodes that will report the alarm or assume that the Raman pump has an effect on the backward direction. References: Nokia Optical Diagnostics and Troubleshooting Course, OAM and Diagnostics Guide
NEW QUESTION # 32
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. Traffic does not pass between the local and adjacent nodes.
- B. A "Power Adjustment Required" alarm is eventually raised on the local node.
- C. A "Data Link Down" alarm is raised on the adjacent 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 # 33
Consider the exhibit.
Which type of loopback is applied?
- A. Line port terminal Ioopback
- B. Client port terminal Ioopback
- C. Client port facility loopback
- D. Line port facility Ioopback
Answer: B
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 # 34
Which of the following is a passive component in a CDC-F network configuration?
- A. 130SCX10 Optical Transponder
- B. WR20-TFM Wavelength Router
- C. IRDM20 Integrated ROADM
- D. MSH4-FSB Fiber Shuffle Module
Answer: D
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 # 35
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/OSC
- B. show interface 1/13/OSCSFP
- C. show interface 1/13/OSC detail
- D. show interface 1/13/OSCSFP detail
Answer: D
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 # 36
What is the default severity level for a Threshold Crossing Alert (TCA) alarm?
- A. Minor
- B. Critical
- C. Major
- D. Warning
Answer: D
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 # 37
Consider the exhibit. Given the following power readings, what is the calculated span loss from Node A to Node B?
- A. 1.5
- B. 11.5
- C. 8.0
- D. 2.5
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 # 38
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. 2.0 dB
- C. 5.0 dB
- D. 8.0 dB
Answer: A
Explanation:
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
NEW QUESTION # 39
On a bidirectional optical amplifier configuration, which of the following are Wavelength Tracker detection points?
- A. An optical amplifier has no Wavelength Tracker detection points.
- B. SIG interface only.
- C. LINE and SIG interfaces.
- D. LINEOUT and SIGOUT interfaces.
Answer: C
Explanation:
Explanation
On a bidirectional optical amplifier configuration, the Wavelength Tracker detection points are the LINE and SIG interfaces. The Wavelength Tracker is a feature that monitors the wavelength of each channel on the optical amplifier and provides feedback to the control system. The Wavelength Tracker can detect wavelength drifts, channel failures, or channel additions or removals on both directions of the optical amplifier. The LINE interface is the input/output port for the optical line signal, while the SIG interface is the input/output port for the optical signal from/to the transponder. The other options are incorrect because the LINEOUT and SIGOUT interfaces are not Wavelength Tracker detection points, and an optical amplifier has Wavelength Tracker detection points. References: Nokia Optical Diagnostics and Troubleshooting Course, OAM and Diagnostics Guide
NEW QUESTION # 40
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