[May-2026 Newly Released] 4A0-205 Exam Questions For You To Pass
Nokia 4A0-205 Exam: Basic Questions With Answers
NEW QUESTION # 32
What is the purpose of the NFM-T node synchronization?
- A. The partial or full node synchronization allows several entities/items defined at EPT level to be retrieved into the NFM-T database (upload from design).
- B. The partial or full node synchronization allows several entities/items defined at node level to be retrieved into the NFM-T database (upload).
- C. The partial or full node synchronization allows several entities/items defined at NFM-T level to be written into the node database (download).
- D. The partial or full node synchronization allows several entities/items defined at NFM-T level to be exported into an XML file, to be used as input for EPT (download to design).
Answer: C
Explanation:
This is done in order to keep the NFM-T database in sync with the nodes in the network. The synchronization process allows the NFM-T to keep track of any changes that are made to the nodes, such as new nodes added, nodes removed, and so on. By synchronizing the node database with the NFM-T, network administrators can ensure that their network is up to date and running efficiently.
NEW QUESTION # 33
How does a Raman pump work in the 1830 specific implementation?
- A. The pump light travels in the same direction of the signal, amplifying it while it flows in the fiber towards the following node.
- B. The pump light travels in the opposite direction of the signal to be amplified, amplifying it while it arrives from the adjacent node.
- C. The amplification is done simultaneously for all channels as they enter the board.
- D. As the incoming signal power increase, the gain of the amplifier is reduced.
Answer: B
Explanation:
In Raman amplification, a pump laser is used to excite the Raman-active molecules in the fiber, which then amplifies the signal light as it travels in the opposite direction. In the 1830 specific implementation, the pump laser is typically a high-power laser that is launched into the fiber in the opposite direction to the signal. The pump light interacts with the Raman-active molecules in the fiber, which then amplifies the signal light as it travels in the opposite direction. This allows the Raman pump to provide a gain that increases with distance, which can be used to compensate for the loss of signal power as it travels through the fiber.
NEW QUESTION # 34
What is the purpose of the NFM-T deploy menu?
- A. It is used to create new network instances, such as physical connections, infrastructures and services.
- B. It is used to deploy additional shelves to existing SWDM nodes.
- C. It is used to deploy new operators (administrator, observers, and so on) to access the platform.
- D. It is used to import EPT files to deploy the network based on the EPT design.
Answer: A
Explanation:
The NFM-T (Network Functions Manager - Transport), now part of the WaveSuite Network Operations Center (WS-NOC), is the centralized management system for Nokia's optical portfolio. The Deploy menu is the primary engine for operationalizing the network. Its fundamental purpose is to create and provision new network instances, which encompasses the lifecycle of the transport infrastructure.
Specifically, this menu allows operators to establish physical connections (fiber links between nodes), build out the infrastructure (defining the topology and node roles), and most importantly, provision services (such as ODUk or Optical Channel services). While the EPT (now WaveSuite Planner) designs the network, and those files can be used as a reference, the actual "birth" of a service in the live network-mapping it from the source transponder to the destination through the required ROADM degrees-is executed via the Deploy menu. It translates the high-level intent into specific cross-connect commands sent to the individual Network Elements (NEs), ensuring that the underlying hardware is correctly configured to carry client traffic.
NEW QUESTION # 35
Which of the following statements best describes the definition of PCT?
- A. A tool supporting external links autodiscovery on NFM-T.
- B. A tool supporting nodes' automatic provisioning on NFM-T.
- C. A tool to validate internal fiber connectivity on CDC-F 2.0 nodes.
- D. A tool supporting zero-touch power management on PSS-32 equipment.
Answer: C
Explanation:
Comprehensive and Detailed Explanation From Nokia Optical Networking Fundamentals:
The Photonic Connectivity Tool (PCT) is a specialized utility within the Nokia 1830 PSS ecosystem designed specifically for modern, complex node architectures. As networks evolved toward CDC-F (Colorless, Directionless, Contentionless with Flex-grid), the internal fiber cabling within a single node became significantly more complex, involving numerous connections between WSS modules, Multicast Switches (MCS), and amplifiers.
The PCT is used to validate internal fiber connectivity, ensuring that the physical "patching" matches the intended design before service provisioning begins. It leverages the OSRP (Optical Signal Routing Protocol) or specialized control plane mechanisms to verify that light can flow through the internal cross-connects as expected. This tool is essential for reducing human error during the installation of high-degree ROADM sites, where dozens of internal fibers must be correctly mapped to ensure the "Directionless" and "Contentionless" features function without blocking.
NEW QUESTION # 36
Which of the following statements is true?
- A. Alarms and conditions report only historical status of the node.
- B. Logs report both active and historical events.
- C. Logs report a real time status of the node.
- D. Alarms and conditions report a real time status of the node.
Answer: B
Explanation:
A log is a record of events that have occurred within a system, such as a network device or an application. Logs can include information about system activity, configuration changes, and error messages. They can be used for troubleshooting, auditing, and compliance purposes. Logs can report both active (real-time) and historical events that have occurred within a system.
Alarms and conditions, on the other hand, are used to notify operators of real-time status of the node, such as when a threshold is breached or when a specific event occurs. Alarms and conditions are typically used to provide real-time notifications of potential problems or issues, while logs are used to provide a historical record of what has occurred.
NEW QUESTION # 37
What is a Shared Risk Group (SRG)?
- A. A set of nodes that share a common risk of hardware failure
- B. A set of boards that share the same failure risk
- C. A set of fibers that share the same latency risk
- D. A set of network resources that share a common failure risk
Answer: D
Explanation:
According to the Nokia Optical Networking documentation, a Shared Risk Group (SRG) is defined as "a set of network resources that share a common failure risk. When a resource in an SRG fails, the other resources in the group are also affected." This can include fibers, boards, nodes, and other network resources. The SRG concept is used in network design and protection mechanisms to ensure survivability and minimal impact on service in case of a failure.
NEW QUESTION # 38
Is it possible to modify node parameters within the edit EPT menu?
- A. Yes, but the user can modify only the node name and location
- B. No, this view is used to display a close-up view of the node
- C. Yes, the user can apply manual changes directly from this view
- D. Yes, the user can apply manual changes but only for non-GMPLS nodes, as the control plane reserves node resources not editable by the user
Answer: D
Explanation:
Yes, the user can apply manual changes but only for non-GMPLS nodes, as the control plane reserves node resources not editable by the user. The edit EPT menu allows the user to view information about a node but is not used to modify node parameters. The user can only apply manual changes to non-GMPLS nodes, as the control plane reserves node resources which cannot be modified by the user.
NEW QUESTION # 39
What is a trail?
- A. An entity to encapsulate a low order signal into a high order container
- B. A link between end points to increase the power budget of the optical link
- C. A transparent transport of a client signal
- D. A physical link between two optical amplifiers
Answer: C
Explanation:
A trail is a transparent transport of a client signal. A trail is a physical link between two points in an optical network, allowing for the transport of a client signal from one point to the other. It is a low-order signal, such as a 10G Ethernet or a Fibre Channel signal, encapsulated into a high-order container, such as a 40G or 100G signal. This allows for the transport of the client signal over longer distances, increasing the power budget of the optical link.
NEW QUESTION # 40
What is the purpose of the validate step in the EPT design process?
- A. During this step, the configuration available on the involved network elements is compared with the design provided by EPT.
- B. This step is optional and is useful to verify the network element layout before going through the commission step.
- C. This step is used to measure optical power performances over an existing network before making changes.
- D. During this step, the run design action is triggered for network design consistency check and errors fixing.
Answer: D
Explanation:
The validate step in the EPT design process is used to trigger the run design action, which is responsible for verifying the consistency of the network design and fixing any errors that may exist. During the validation process, the system will compare the configuration available on the involved network elements and the design provided by EPT, and any discrepancies will be flagged for further investigation or correction.
NEW QUESTION # 41
How can a mesh network be upgraded so that more services can be transported?
- A. Upgrading the network to coherent transmission is the only effective way to enable more bandwidth to the existing mesh network.
- B. Configuring new WSS cards is the most effective way to give flexibility and network bandwidth to an existing mesh network.
- C. The Protection and Restoration Combined (PRC) mechanism can enable more bandwidth but only for the protected services.
- D. Upgrading link capacity and/or installing new links provides more bandwidth to the existing mesh network.
Answer: D
Explanation:
Comprehensive and Detailed Explanation From Nokia Optical Networking Fundamentals:
While technologies like WSS (Wavelength Selective Switches) and coherent transmission (100G/200G/400G+) significantly improve the efficiency and reach of a network, the most direct way to increase the total transportable volume of services in a mesh topology is to upgrade link capacity or install new physical links. In Nokia optical planning, upgrading link capacity typically involves moving from a lower-rate system (like 10G) to a higher-rate system (like 100G or 400G) or increasing the number of available wavelengths by expanding from a 40-channel to an 80-channel or 96-channel C-band system.
Adding new links (new fiber spans) creates more degrees in the mesh, providing more paths for traffic and increasing the overall aggregate bandwidth of the network. Option A refers to flexibility (ROADM functionality) rather than raw capacity. Option B (PRC) relates to survivability and availability, not capacity expansion. While Option C (coherent transmission) is a powerful method for increasing capacity per wavelength, it is not the "only" way, as adding more fiber (spatial multiplexing) or more channels (spectral density) are also primary methods for scaling a mesh network to handle more services.
NEW QUESTION # 42
Which use case is most suitable for the deployment of a star topology?
- A. SNCP-protected links
- B. ASON networks, to protect traffic via GMPL5 protocols
- C. Backbone networks, for supporting protection routes
- D. Access networks, for collecting traffic towards the main central node
Answer: D
Explanation:
A star topology is a network design where all devices are connected to a central hub, which acts as a central point of control and management for the network. This type of topology is commonly used in access networks, where a central node is used to aggregate traffic from multiple users or devices, and then forward it to the core network. This design allows for efficient use of resources and easy management of the network.
Reference:
"Computer Networking: A Top-Down Approach" by James Kurose and Keith Ross (Chapter 3)
"Data Communications and Networking" by Behrouz A. Forouzan (Chapter 2)
NEW QUESTION # 43
Is it possible to open and manage EPT designs that are created with different releases than the release installed on the local workstation?
- A. Designs created with an older release can be opened by a current release but cannot make changes.
- B. Only designs created with current and older releases can be opened and edited.
- C. Only designs created with the current release can be opened and edited.
- D. No restrictions are imposed on the software release.
Answer: B
Explanation:
It is possible to open and manage EPT designs that are created with different releases than the release installed on the local workstation, however only designs created with current and older releases can be opened and edited. Designs created with an older release can be opened by a current release but changes cannot be made.
NEW QUESTION # 44
When monitoring the quality of the received signal in WDM, an open eye indicates:
- A. High distortion
- B. Presence of high inter-symbolic interference
- C. High jitter
- D. Low noise
Answer: D
Explanation:
An open eye pattern indicates that the signal is not affected by noise, and the received signal is of high quality. This is because an open eye pattern is the result of a signal that is aligned in time, and is not affected by noise or other distortions.
Reference:
"Optical Fiber Communications" by Gerd Keiser
"Fiber-Optic Communications Technology" by Djafar K. Mynbaev
"Optical Communications" by Gerd Keiser
NEW QUESTION # 45
Which sentence about NFM-T is correct?
- A. NFM-T fully supports optical and IP nodes
- B. NFM-T is used to design and manage optical network
- C. NFM-T is used to provision optical services having IP nodes as extremities
- D. NFM-T fully supports LO, LI, L2 and GMPLS applications and it is mainly focused on 1830 PSS, as well as other older product families
Answer: C
Explanation:
NFM-T is a network management system designed to manage optical networks in a unified manner. It is used to design, manage, and provision optical services having IP nodes as extremities. It supports a variety of technologies, including optical and IP, and fully supports LO, LI, L2, and GMPLS applications. It is mainly focused on the Nokia 1830 PSS product family, as well as other older product families.
NEW QUESTION # 46
In which window(s) does the attenuation reach its minimum peak?
- A. Third window (1550 nm)
- B. Both first and second windows
- C. First window (850 nm)
- D. Second window (1300 nm)
Answer: A
Explanation:
The third window (1550 nm) is where the attenuation reaches its minimum peak. This is because the materials used in fiber optic cables have minimal absorption in this wavelength range. The first and second windows (850 nm and 1300 nm respectively) have higher attenuation due to the materials used in the fiber optic cables.
NEW QUESTION # 47
Where can the user set the long-haul WT decoder parameter, when designing a network with EPT?
- A. In the NE parameters
- B. In the audit menu
- C. In the optimization parameters
- D. In the network parameters
Answer: A
Explanation:
The long-haul WT decoder parameter can be set in the NE parameters when designing a network with EPT. This parameter is used to adjust the sensitivity of the decoder and can help to improve the accuracy of the measurements for long-haul WTs.
The Network Element (NE) parameters in EPT (Element Planning Tool) are used to configure various settings and options for the network elements in the network. The long-haul WT decoder parameter is one such setting that can be configured in the NE parameters section. The user can access the NE parameters by navigating to the NE Parameters menu within the EPT interface. The user can then select the appropriate network element and modify the settings as needed. This information can be found in the Nokia guide for EPT.
NEW QUESTION # 48
What is the block that converts the colorless (or black and white) client signal to a specific optical channel in a WDM system?
- A. Static filter device (SFD)
- B. Wavelength router (WR)
- C. Dispersion compensation module (DCM)
- D. Optical transponder (OT)
Answer: D
Explanation:
Comprehensive and Detailed Explanation From Nokia Optical Networking Fundamentals:
The Optical Transponder (OT) is the essential interface component in a WDM system that bridges the gap between the client-side equipment and the WDM line-side. Client signals, often referred to as "colorless" or "black and white" because they typically use standard 1310nm or 1550nm short-reach optics, cannot be directly multiplexed into a DWDM fiber because they would interfere with one another.
The Transponder performs an O-E-O (Optical-Electrical-Optical) conversion process: it receives the client's optical signal, converts it to an electrical format to perform 3R functions (Re-amplification, Re-shaping, and Re-timing) and often wraps it into an OTN (Optical Transport Network) frame, and then re-transmits it using a high-precision, ITU-T grid-compliant colored wavelength. In the Nokia 1830 PSS portfolio, these can be dedicated transponders for a single high-speed service or Muxponders, which aggregate multiple lower-speed client signals into a single high-speed "colored" line interface. Other components like the SFD are used for multiplexing those colors, and the DCM is used for managing fiber impairments, but only the Transponder performs the initial frequency conversion.
NEW QUESTION # 49
How is it possible to check the activation status of GMRE on a node?
- A. The ControlPlane status column on the node list displays the GMRE status for the selected node
- B. The GMRE activation status is reported in the supervision state column on the node list
- C. The GMRE reachability can be tested via ping request from NFM-T
- D. The GMRE activation status is reflected on the color of the icon representing the node
Answer: B
Explanation:
The GMRE activation status is reported in the supervision state column on the node list. The supervision state column displays the GMRE status of the node, which is either "Activated" or "Not Activated". This allows the user to quickly check the GMRE activation status of a node without having to ping the node from the NFM-T platform.
NEW QUESTION # 50
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