Nokia BL0-220 Nokia Bell Labs Distributed Cloud Networks Exam Practice Test

Answer : B

The ETSI MANO Model operational stack is defined as Orchestration above Network Function Management above Infrastructure Management.The ETSI MANO Model is a framework that defines the architecture and interfaces for the management and orchestration of network functions virtualization (NFV) in cloud networks1.The ETSI MANO Model consists of three main components: Infrastructure Management, Network Function Management, and Orchestration2.Infrastructure Management is responsible for managing the physical and virtual resources that host the network functions, such as servers, storage, switches, hypervisors, and virtual machines2.Network Function Management is responsible for managing the configuration, monitoring, and optimization of the network functions, such as scaling, healing, and updating2.Orchestration is responsible for coordinating the allocation and release of resources for network services and network slices, such as instantiation, termination, and modification2.The ETSI MANO Model operational stack is defined as Orchestration above Network Function Management above Infrastructure Management, meaning that Orchestration is the highest level of abstraction and control, Network Function Management is the intermediate level, and Infrastructure Management is the lowest level2.Reference:1: Nokia Bell Labs Distributed Cloud Networks, Unit 5: New Services Automation, Section 5.3: Orchestration2: Module by Module - Self Study Note Guide - training2

Answer : B

A YAML XML template file contains the configuration of a VNF or CNF. A VNF stands for Virtual Network Function, which is a software-based network function that runs on a virtual machine or a container. A CNF stands for Cloud-native Network Function, which is a network function that is designed and implemented using cloud-native principles and technologies, such as microservices, containers, and Kubernetes. A YAML XML template file is a file that defines the structure, parameters, and dependencies of a VNF or CNF, as well as the resources and policies required to deploy and manage it. A YAML XML template file is based on the TOSCA (Topology and Orchestration Specification for Cloud Applications) standard, which is a language for describing the components and relationships of complex cloud applications. A YAML XML template file is used by the MANO (Management and Orchestration) system to instantiate, configure, and operate a VNF or CNF on the cloud infrastructure.Reference:Nokia Bell Labs 5G Professional Certification - Distributed Cloud Networks, Unit 2: Cloud Technologies and Features, Section 2.4: Cloud Software and Hardware Resources.

Answer : B

The Management Plane is the logical layer of a network that provides network management and control functions, such as configuration, monitoring, fault detection, performance analysis, and security1.The Management Plane interacts with the Control Plane and the Data Plane, which are responsible for traffic routing and forwarding, respectively2.The Management Plane also supports the orchestration and automation of network services across the distributed cloud3.Therefore, option B best describes the Management Plane, while options A and C are incorrect.Reference:1:Nokia Bell Labs Distributed Cloud Networks, Unit 4: Operating Your Cloud, Topic: Management Plane2:Module by Module - Self Study Note Guide, DC4.1-- Industry Trends in Data Center Hardware3:Nokia Bell Labs Distributed Cloud Networks, Unit 5: New Services Automation, Topic: Management and Orchestration

Answer : B

The best option to complete the sentence isVNF Forwarding Graph.A VNF Forwarding Graph (VNF-FG) is a logical representation of a network service that consists of a set of interconnected Virtual Network Functions (VNFs) and the traffic flows between them1.The VNF-FG is used to orchestrate and manage traffic through VNFs by specifying the order and the requirements of the VNFs that need to be traversed by the traffic2.The VNF-FG also defines the connection points, virtual links, and network forwarding paths that are involved in the service delivery3.Reference:1:VNF Forwarding Graph and Network Service-Beginner's Guide, Introduction2:A survey of VNF forwarding graph embedding in B5G/6G networks - Springer, Section 13:A Deep Reinforcement Learning Approach for VNF Forwarding Graph Embedding, Section I

Answer : D

A fault detection event will trigger the auto-healing operation.Auto-healing is a feature of cloud networks that enables the automatic recovery of resources or services from failures or errors1.Fault detection is the process of identifying and locating faults in the network using various methods such as monitoring, logging, or testing2.When a fault is detected, the auto-healing operation will initiate the appropriate actions to restore the normal functioning of the network, such as restarting, repairing, or replacing the faulty components1. Threshold, warning message, and new status are not events that trigger the auto-healing operation.Threshold is a predefined value or limit that indicates the acceptable performance or behavior of a resource or service3.Warning message is a notification or alert that informs the user or operator about a potential problem or risk in the network4. New status is a change or update in the state or condition of a resource or service, such as active, inactive, or degraded.

Answer : A, B, D

Closed loop automation Comprehensive Explanation and Reference of Correct Answer: AI/ML based operation requires pre-defined policies, open APIs, and closed

Nokia Bell Labs 5G Professional Certification - Distributed Cloud Networks | Nokia Distributed Cloud Networks, Unit 4: Operating Your Cloud, slide 7

Nokia, A1 and Microsoft deploy industry's first 5G edge cloud network slicing solution for enterprises | Nokia, paragraph 4

Answer : A, C

Cloud resource management provides management of the resources quota and the ability to scale resources up and down. Resource quota is the limit on the amount of resources that a tenant can use in a cloud environment, such as CPU, memory, storage, network, etc. Resource quota helps to prevent overconsumption of resources by a single tenant and to ensure fair allocation of resources among multiple tenants. The ability to scale resources up and down means that the cloud can dynamically adjust the amount of resources allocated to a tenant based on the demand and availability. Scaling resources up and down helps to optimize the performance and efficiency of the cloud, as well as to reduce the cost and waste of resources.Reference:Nokia Bell Labs Distributed Cloud Networks,Cloud Resource Planning