Question 1

In which window(s) does the attenuation reach its minimum peak?

Accepted Answer

C

Explanation: The attenuation of an optical signal in a silica-based fiber is wavelength-dependent. The third transmission window, centered around 1550 nm, exhibits the lowest signal loss, typically around 0.2 dB/km. This minimum is achieved because Rayleigh scattering, a dominant loss factor, decreases with increasing wavelength (proportional to 1/λ⁴), while infrared absorption begins to increase only at longer wavelengths. This ultra-low attenuation makes the 1550 nm window, also known as the C-band (Conventional Band), the preferred choice for long-haul and Dense Wavelength Division Multiplexing (DWDM) systems, especially since it aligns with the operating range of Erbium-Doped Fiber Amplifiers (EDFAs).

Question 2

Which application generates the commissioning file(s)?

Accepted Answer

C

Explanation: The Commissioning and Provisioning aPplication (CPB) is the designated Nokia tool for generating the commissioning files required to bootstrap a network element (NE). The CPB takes network design data, typically exported from the Engineering and Planning Tool (EPT), and uses it to create the specific XML-based configuration files. These files contain the initial boot options (BOF) and configuration parameters that enable a new NE to come online and establish communication with the Network Services Platform (NSP) for ongoing management.

Question 3

Where can the user set the long-haul WT decoder parameter, when designing a network with EPT?

Accepted Answer

C

Explanation: The "long-haul WT decoder" is a specific hardware-level parameter for an optical transponder card within a Network Element (NE). In the Nokia EPT (Ethernet Packet Transport) design tool, parameters that are specific to the hardware configuration of a particular node, such as the operational mode of a card or port, are set within the properties of that NE. This allows designers to accurately model the specific equipment and its capabilities for different links (e.g., long-haul vs. metro) within the network plan.

Question 4

How is it possible to check the activation status of GMRE on a node?

Accepted Answer

C

Explanation: The supervision state, displayed in the "Supervision State" column of the Network Element (NE) list within the Nokia NFM-T (Network Functions Manager - Transport), is the primary indicator of the management status of a node. For a node to be in a "Managed" state, the NFM-T must have established and maintained successful communication via the management control plane. In Nokia optical networks, this communication relies on the Generic Management Routing Engine (GMRE). If GMRE is not activated or is malfunctioning, the NFM-T cannot communicate with the node, causing its supervision state to change to "Unreachable". Therefore, this state directly reflects the operational status of GMRE.

Question 5

How are the EPT systems related to NFM-T when CPB is performed?

Accepted Answer

C

Explanation: The NFM-T (Network Functions Manager - Transport) Configuration and Provisioning Backup (CPB) feature is designed to provide administrators with granular control over data backup operations. When Engineering and Planning Tool (EPT) systems are integrated with NFM-T, they are treated as distinct data sources. The CPB user interface explicitly displays these EPT systems alongside the primary NFM-T server. This allows the operator to individually select or deselect each system for inclusion in the backup set, offering flexibility to perform complete or partial backups based on operational requirements.

Question 6

What is the meaning of first, second, and third window in the optical fiber propagation context?

Accepted Answer

B

Explanation: The first, second, and third optical windows are specific wavelength ranges (intervals) where attenuation in silica-based optical fibers is minimal, making them suitable for signal transmission. These windows are centered around 850 nm (first), 1310 nm (second), and 1550 nm (third). The low signal loss in these intervals is a fundamental property of the fiber medium. Modern high-capacity systems, particularly those using Wavelength Division Multiplexing (WDM), predominantly operate in the third window (specifically the C-band and L-band) to leverage the lowest possible attenuation for long-distance communication.

Question 7

What is a Shared Risk Group (SRG)?

Accepted Answer

D

Explanation: A Shared Risk Group (SRG) is a fundamental concept in network resiliency design. It defines a set of network resources, such as links, nodes, or line cards, that are exposed to a common point of failure. If that single point fails (e.g., a fiber cut in a shared conduit, a power outage in a facility), all resources within the SRG are likely to fail simultaneously. By identifying and configuring SRGs, network management and routing protocols (like RSVP-TE with Fast Reroute) can compute and establish physically diverse primary and backup paths, ensuring that a single failure event does not impact both paths, thereby improving overall network availability.

Question 8

What is the OAMP LAN interface?

Accepted Answer

B

Explanation: The OAMP (Operations, Administration, Maintenance, and Provisioning) LAN interface on a Nokia 1830 PSS is a standard RJ-45 Ethernet port located on the equipment controller card. Its primary function is to connect the network element to a Data Communications Network (DCN) or management network. This connection requires the configuration of an IP address on the interface, which makes the node reachable for remote management activities such as configuration, performance monitoring, fault management, and software upgrades via protocols like SNMP, TL1, and SSH.

Question 9

Is it possible to open and manage EPT designs that are created with different releases than the release installed on the local workstation?

Accepted Answer

B

Explanation: The Nokia Engineering and Planning Tool (EPT) is designed with backward compatibility. This allows a user with a current version of the EPT software to open, edit, and save network designs that were created using older releases of the tool. When an older design is opened, it is typically upgraded to the current version's format. However, the tool is not forward-compatible, meaning an older version of EPT cannot open a design that has been saved with a newer release. This is a standard software compatibility model that ensures users can migrate their work forward to new software versions.

Question 10

What is a degree-1 node?

Accepted Answer

A

Explanation: In optical network topology, the "degree" of a node refers to the number of transmission links or directions connecting it to other nodes in the network. A degree-1 node, by definition, has only a single link. This means it can only send and receive traffic from one direction, making it an endpoint or a terminal in the network topology. Such nodes are often found at the end of a spur off a main ring or mesh structure, serving as a point of traffic origination or termination.

Free Nokia 4A0-205 Actual Exam Questions