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Nokia 4A0-265 Exam Syllabus Topics:

Section	Objectives
Topic 1: Maintenance and Optimization	- Network optimization techniques 1. Capacity and performance tuning 2. Signal quality optimization - Preventive maintenance 1. Degradation detection 2. Performance trend analysis
Topic 2: Network Diagnostics and Troubleshooting	- Fault detection methods 1. Performance monitoring indicators 2. Alarm interpretation and correlation - Troubleshooting procedures 1. Layered fault isolation approach 2. Root cause analysis techniques
Topic 3: Optical Network Fundamentals	- Optical transmission principles 1. Signal attenuation and dispersion concepts 2. Light propagation and fiber characteristics - DWDM/OTN basics 1. Wavelength division multiplexing principles 2. Optical transport network architecture overview
Topic 4: Optical Equipment and System Operation	- Nokia optical platform components 1. ROADM and optical amplifiers 2. Transponders and muxponders - System configuration and monitoring 1. Network management system usage 2. Provisioning and service activation basics

Nokia Optical Diagnostics and Troubleshooting Sample Questions:

1. 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. 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.
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. 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.

2. 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 scot
B) config powermgmt ingress 1/10 adjust
C) config powermgmt ingress 1/10
D) config powermgmt ingress 1/10 power adjustment

3. 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 = 2
(ii) number of service affecting alarms = 2
(Hi) number of conditions = 18
B) (i) total number of alarms = 7
(ii) number of service affecting alarms = 5
(Hi) number of conditions = 7
C) (I) total number of alarms = 5
(ii) number of serviceaffectingalarms = 2
(Hi) number of conditions = 14
D) (i) total number of alarms = 4
(ii) number of service affecting alarms = 14
(iii) number of conditions = 2

4. 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 above a specified OSNR threshold.
C) FEC enables errors to be detected and corrected without retransmission. This technique is effective only below a specified OSNR threshold.
D) FEC enables errors to be detected and data to be retransmitted. This technique is effective only above a specified OSNR threshold.

Solutions:

Question # 1
Answer: B

Question # 2
Answer: B

Question # 3
Answer: B

Question # 4
Answer: B