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

Answer : C

Monolithic applications are a mono-block functional service because they are composed of a single, self-contained unit that contains all the components of the application, such as the user interface, business logic, data access, etc1.Monolithic applications are not smaller in size than cloud native applications, as they tend to grow larger and more complex over time2.Monolithic applications are not more reliable than microservices, as they are more prone to failures, bugs, and performance issues due to the tight coupling and interdependency of the components3.Monolithic applications do not involve the most complex management strategy, as they are easier to develop, test, and deploy initially, but they become harder to maintain, scale, and update as the application evolves4.Reference:1: Nokia Bell Labs Distributed Cloud Networks, Unit 2: Cloud Technologies and Features, Section 2.4: Cloud Application Architectures2:Monolithic Architecture3:Microservices vs Monolithic Architecture4:Monolithic vs. Microservices Architecture

Answer : B

On-Boarding of a Network Service requires both NS and NF templates. NS stands for Network Service, which is a logical grouping of network functions and resources that provide a specific functionality or service to the end user. NF stands for Network Function, which is a software component that performs a specific task or function within the network. Templates are files that describe the characteristics, requirements, and dependencies of network services and network functions. On-Boarding is the process of registering and validating network services and network functions in the cloud platform, so that they can be instantiated and managed.

Nokia Bell Labs 5G Professional Certification - Distributed Cloud Networks, Unit 5: New Services Automation, slide 7

Module by Module - Self Study Note Guide, DC5.1-- New Services Automation, page 19

On-boarding a Network Service typically involves Network Service (NS) and Network Function (NF) templates. NS templates define the overall structure and requirements of a network service, including its composition of various NFs and their interconnections. NF templates specify the configurations for individual network functions that are part of the service. Together, they enable the automated deployment and management of complex network services in a standardized manner.

Answer : B

Multitenancy in cloud computing defines a set of cloud resources shared by several customers. Multitenancy is a feature of cloud computing that allows multiple customers, or tenants, to use the same cloud infrastructure and services, such as servers, storage, network, and applications, while maintaining their own data and configuration. Multitenancy enables cloud providers to optimize the utilization and allocation of cloud resources, reduce the cost and complexity of cloud operations, and offer scalable and flexible services to different customers. Multitenancy also benefits customers by providing them with on-demand access to cloud resources, pay-per-use pricing models, and enhanced security and isolation. The other options are not correct definitions of multitenancy in cloud computing. A set of cloud resources isolated from each other is a single-tenant model, where each customer has its own dedicated cloud infrastructure and services. A set of cloud resources located in different data centers is a distributed cloud model, where cloud resources are spread across multiple physical locations to provide low latency, high availability, and local compliance. A set of cloud resources assigned to the same network slice is a network slicing model, where a logical network is created over a shared physical network to support specific applications and customers with customized performance, quality, and security.Reference:Nokia Bell Labs 5G Professional Certification - Distributed Cloud Networks, Unit 2: Cloud Technologies and Features, Section 2.2: Cloud Characteristics.

Answer : A

The networking concept of ''Underlay'' refers to the physical network layer that provides the connectivity and transport for the overlay network, which is the virtual network layer that runs on top of the underlay network1.The underlay network is composed of routers, switches, links, and protocols that enable the data transmission between different locations2.The underlay network is independent of the overlay network, meaning that it does not need to be aware of the network configuration, policies, or services of the overlay network3.Therefore, option A best describes the underlay network, while options B, C, and D are incorrect.Reference:1:Nokia Bell Labs Distributed Cloud Networks, Unit 2: Cloud Technologies and Features, Topic: Underlay and Overlay Networks2:Module by Module - Self Study Note Guide, DC2.2-- Cloud Options3:Underlay Network - an overview | ScienceDirect Topics, Overview

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 : 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

Answer : B

Different paths for a NF providing Cloud Resilience are defined in aNetwork Service Descriptor. A Network Service Descriptor (NSD) is a document that describes the topology, configuration, and requirements of a network service.It specifies the network functions (NFs) that compose the service, the virtual links that connect them, and the forwarding graphs that define the traffic flows between them1.A NSD also defines the resilience policies for each NF, such as the number of instances, the scaling triggers, the fault management actions, and the alternative paths in case of failures2. A Network Function template, an NS Orchestrator configuration, and an NFV Orchestrator configuration are not the correct options to complete the sentence.A Network Function template is a document that describes the characteristics and requirements of a single network function, such as the virtualization environment, the resources, the interfaces, and the dependencies1.An NS Orchestrator configuration is a set of parameters that control the behavior and operation of the NS Orchestrator, which is a component that manages the lifecycle of network services3.An NFV Orchestrator configuration is a set of parameters that control the behavior and operation of the NFV Orchestrator, which is a component that coordinates the allocation and release of resources for network services3.Reference:1: Nokia Bell Labs Distributed Cloud Networks, Unit 3: Cloud Resource Planning, Section 3.2: Network Function2: Nokia Bell Labs Distributed Cloud Networks, Unit 3: Cloud Resource Planning, Section 3.3: Network Service Descriptor Role3: Nokia Bell Labs Distributed Cloud Networks, Unit 4: Operating Your Cloud, Section 4.1: Industry Trends in Data Center Hardware