Nokia 4A0-220 Exam Dumps

The correct answer identifies realistic GMPLS operational and maintenance procedures that network operators perform regularly. Monitoring RSVP-TE adjacencies and Keep-Alive messages ensures that the control plane connectivity between neighboring nodes remains healthy; loss of adjacencies indicates control channel problems that could prevent dynamic LSP establishment. Verifying link state database consistency (comparing OSPF-TE LSA databases across nodes) detects convergence issues or routing inconsistencies that could lead to suboptimal path selection or provisioning failures. Collecting optical signal quality metrics (such as OSNR, Q-factor, or chromatic dispersion) allows operations teams to identify degrading optical links before they fail, enabling proactive maintenance. LSP grooming (periodically reorganizing established LSPs to consolidate traffic and reduce fragmentation) maintains efficient use of optical spectrum and network capacity over time.

The other options describe poor or harmful practices: restarting control processes indiscriminately causes unnecessary LSP disruptions and converge delays; disabling topology advertisement eliminates dynamic provisioning capabilities; removing protection LSPs eliminates resilience without adding capacity (restoration cannot guarantee recovery in all failure scenarios); and restricting signaling to maintenance windows contradicts the fundamental purpose of GMPLS, which is to enable dynamic, on-demand provisioning during normal operations. The correct answer reflects best practices for GMPLS network operations as covered in the 4A0-220 curriculum.

The GMRE node address is the IP address for communication between network elements (NEs) in a GMPLS-controlled optical network. The GMRE node address is also known as the GMRE loopback address or the GMPLS node IP. It is used by GMPLS protocols such as LMP and RSVP to identify and communicate with other GMRE nodes. The GMRE node address is configured on each NE and is advertised by OSPF-TE to other nodes in the same area.Reference:Nokia 1830 PSS-4, PSS-8, PSS-16 and PSS-32 Platforms - NATO,1830 PSS Identifiers

A Nominal Route in a GMPLS network is the optimal path that meets the Traffic Engineering (TE) constraints for a given LSP request. A Nominal Route is calculated by the NFM-T using the Constrained Shortest Path First (CSPF) algorithm, which takes into account parameters such as bandwidth, latency, priority, protection type, and other QoS attributes. A Nominal Route is stored in the NFM-T database and can be used to provision LSPs over the network. A Nominal Route can differ from the Current Route, which is the actual path that the LSP is taking at a given time, due to network changes or failures.Reference:Nokia GMPLS-controlled Optical Networks Course | Nokia,Nokia Advanced Optical Network Management with NFM-T Course | Nokia

The provisioning steps that are common in both CP to plain MP networks are node creation, CPB provisioning process, node synchronization, and CPB power balance. These steps are required to create and commission the nodes, provision the cross-connect boards (CPBs), associate the links between the nodes, synchronize the network elements (NEs) with the NFM-T, and balance the power levels of the CPBs.Reference:Nokia GMPLS-controlled Optical Networks Course | Nokia,Nokia Advanced Optical Network Management with NFM-T Course | Nokia

A distributed control plane for GMPLS means that each router has software to run the GMPLS protocols and can modify the node's switching fabric. This allows the routers to communicate with each other and establish Label Switched Paths (LSPs) across the network without relying on a centralized controller or network manager. A distributed control plane can improve the scalability, reliability, and efficiency of the network.Reference:Nokia GMPLS-controlled Optical Networks Course | Nokia,GMPLS - Nokia