BL0-220 Nokia Bell Labs Distributed Cloud Networks Questions and Answers

The available options to interconnect private Datacenters are VPN and Backbone. VPN stands for Virtual Private Network, which is a secure and encrypted connection between two or more networks over the public internet. Backbone is a high-capacity network that connects different data centers across regions or countries. Both VPN and Backbone provide reliable, scalable, and secure data center interconnect (DCI) solutions for private/hybrid clouds.  References :  Nokia Cloud DCI offers a more scalable, reliable and secure way to connect data centers in private/hybrid clouds ,  Nokia business-critical cloud DCI solutions support multiple DCI applications, from real-time business continuity and disaster recovery, to synchronous data replication and cloud backup ,  Nokia partners with IP Telecom to deliver quantum-safe data center connectivity

 Low latency is the primary benefit of an Edge Cloud.  Edge Cloud is a distributed cloud architecture that brings cloud resources closer to the end users and devices, reducing the distance and delay for data transmission 1 .  Low latency is crucial for many 5G use cases that require real-time responsiveness, such as autonomous driving, remote surgery, smart manufacturing, etc 2 .  Low cost, large bandwidth, and high availability are not the primary benefits of an Edge Cloud, although they may be achieved depending on the deployment scenario and the service level agreement.  References :  1 : Nokia Bell Labs Distributed Cloud Networks, Unit 1: Cloud Ecosystem, Section 1.2: Cloud Types  2 : Nokia Bell Labs Distributed Cloud Networks, Unit 5: New Services Automation, Section 5.1: Industry 4.0 Use Cases

 Distributed cloud is a concept that refers to the deployment of cloud services across multiple locations, such as public, private, hybrid, or edge clouds 1 .  Cloud options are the different types of cloud models that can be used to meet the specific needs and requirements of different applications and users 2 .  Cloud options are complementary with distributed cloud, as they enable the flexibility and scalability of cloud services across the cloud continuum 3 .  Therefore, option B is the correct statement, while options A and C are incorrect.  References :  1 :  Nokia Bell Labs Distributed Cloud Networks , Unit 2: Cloud Technologies and Features, Topic: Distributed Cloud Description  2 :  Nokia Bell Labs Distributed Cloud Networks , Unit 2: Cloud Technologies and Features, Topic: Cloud Options  3 :  Cloud continuum | Nokia , Overview

Adaptability is the most critical benefit a cloud native deployment provides when deploying applications in complex and very low predictive environments.  Cloud native applications are designed to be modular, scalable, resilient, and portable across different cloud platforms 1 .  They can leverage the cloud features such as automation, orchestration, and service discovery to dynamically adjust to changing conditions and demands 2 .  This enables them to cope with the complexity and unpredictability of the environments they operate in, such as edge computing, industrial automation, and smart cities 3 . Capability and reliability are also important benefits of cloud native deployment, but they are not the most critical ones.  Capability refers to the ability to deliver high-performance and feature-rich applications that meet the user and business needs 1 .  Reliability refers to the ability to ensure the availability and consistency of the applications despite failures or errors 1 .  However, these benefits are not sufficient if the applications cannot adapt to the evolving and diverse scenarios they face in the real world.  References :  1 : Nokia Bell Labs Distributed Cloud Networks, Unit 2: Cloud Technologies and Features, Section 2.3: Cloud Native applications design  2 : Nokia Bell Labs Distributed Cloud Networks, Unit 2: Cloud Technologies and Features, Section 2.5: Microservices and Containerization  3 : Google Cloud, Nokia partner to accelerate cloud-native 5G 3

Latency, Privacy and Capacity are the three key drivers required for video-based service in on-premise cloud. Latency refers to the delay between the source and the destination of a video stream, which affects the quality of experience for the end-users. Privacy refers to the protection of the video content and the user data from unauthorized access or leakage. Capacity refers to the ability of the network and the cloud to handle the high bandwidth and storage demands of video applications. On-premise cloud is a cloud deployment model where the cloud infrastructure is located within the enterprise premises, and is managed by the enterprise or a third-party service provider. On-premise cloud can offer lower latency, higher privacy and greater capacity for video-based service than public cloud, which is located outside the enterprise premises and is shared by multiple tenants.  References :  Nokia Bell Labs 5G Professional Certification - Distributed Cloud Networks , Unit 2: Cloud Technologies and Features, Section 2.3: Cloud Deployment Models.

The properties related to a private cloud are high CAPEX and full control. CAPEX stands for capital expenditure, which is the money spent on acquiring or upgrading physical assets such as servers, storage, and network equipment. A private cloud requires high CAPEX because the cloud owner has to invest in building and maintaining the cloud infrastructure. Full control means that the cloud owner has the exclusive authority and responsibility over the cloud resources, security, and operations. A private cloud offers full control because the cloud owner can customize the cloud according to their specific needs and preferences, and can ensure the privacy and compliance of their data and applications.  References :  Nokia Cloud Platform ,  Module by Module - Self Study Note Guide

 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.

References :

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.

 The best option to complete the sentence is  VNF 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 them 1 .  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 traffic 2 .  The VNF-FG also defines the connection points, virtual links, and network forwarding paths that are involved in the service delivery 3 .  References :  1 :  VNF Forwarding Graph and Network Service-Beginner’s Guide , Introduction  2 :  A survey of VNF forwarding graph embedding in B5G/6G networks - Springer , Section 1  3 :  A Deep Reinforcement Learning Approach for VNF Forwarding Graph Embedding , Section I

The main parameters of policy-based auto-scaling are  threshold  and  min/max values .  Threshold is the value of a metric that triggers the scaling action, such as CPU utilization or memory usage 1 .  Min/max values are the minimum and maximum number of instances or resources that can be scaled up or down 1 . Priority and description are not parameters of policy-based auto-scaling.  Priority is the order of execution of policies in case of conflicting or overlapping conditions 2 .  Description is the optional text that provides additional information about the policy 2 .  References :  1 :  Nokia Bell Labs Distributed Cloud Networks , Unit 4: Operating Your Cloud, slide 24  2 :  Nokia CloudBand Application Manager User Guide , Chapter 9: Scaling Policies, page 151

The Core or Central Cloud covers a very large area, as it is the most centralized part of the Distributed Cloud architecture. It provides high-performance computing and storage resources for applications that do not require low latency or high bandwidth. It also hosts the management and orchestration functions for the entire Distributed Cloud network.  The Core or Central Cloud is typically located in a data center or a cloud service provider’s facility 1 2 .  References :

Nokia Bell Labs 5G Professional Certification - Distributed Cloud Networks

Nokia Bell Labs 5G Certification Program - Courses

The characteristics of traditional monolithic services are low scalability and fixed capacity. Monolithic services are applications that are built as a single unit, where all the components are tightly coupled and run in the same process. This makes them hard to scale, as they require more resources and coordination to handle increased demand. Monolithic services also have fixed capacity, as they are designed for a specific workload and cannot adapt to changing requirements or traffic patterns. Monolithic services are often slow to deploy, as they require updating the entire application for any change or improvement.  References : [Cloud Native applications design], [Microservices and Containerization]

The most appropriate word to complete the sentence is  benefits .  The public cloud ecosystem offers many benefits to users, such as scalability, flexibility, cost-efficiency, and innovation 1 2 .  Constraints, problems, and operability are not suitable words to describe the advantages of the public cloud ecosystem over the simple consumption of resources.  References :  1 :  Nokia Bell Labs Distributed Cloud Networks , Unit 1: Cloud Ecosystem, slide 7  2 :  Nokia Bell Labs 5G Certification Program - Blended Learning , Section 2: Distributed Cloud Networks, slide 9

 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 errors 1 .  Fault detection is the process of identifying and locating faults in the network using various methods such as monitoring, logging, or testing 2 .  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 components 1 . 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 service 3 .  Warning message is a notification or alert that informs the user or operator about a potential problem or risk in the network 4 . New status is a change or update in the state or condition of a resource or service, such as active, inactive, or degraded.

References :  1 : Nokia Bell Labs Distributed Cloud Networks, Unit 4: Operating Your Cloud, slide 9  2 : Nokia Bell Labs Distributed Cloud Networks, Unit 4: Operating Your Cloud, slide 10  3 : Nokia Bell Labs Distributed Cloud Networks, Unit 4: Operating Your Cloud, slide 11  4 : Nokia Bell Labs Distributed Cloud Networks, Unit 4: Operating Your Cloud, slide 12 : Nokia Bell Labs Distributed Cloud Networks, Unit 4: Operating Your Cloud, slide 13

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.  References :  Nokia Bell Labs 5G Professional Certification - Distributed Cloud Networks , Unit 2: Cloud Technologies and Features, Section 2.4: Cloud Software and Hardware Resources.

Closed loop automation Comprehensive Explanation and References of Correct Answer: AI/ML based operation requires pre-defined policies, open APIs, and closed loop automation to enable intelligent and adaptive cloud management and orchestration. Pre-defined policies provide the rules and objectives for the cloud resources and services, such as performance, security, and cost. Open APIs allow the communication and integration of different cloud components and platforms, such as Nokia’s 5G Edge Slicing solution and Microsoft Azure edge and cloud. Closed loop automation enables the continuous monitoring, analysis, and optimization of the cloud ecosystem based on the feedback from the AI/ML algorithms.

References :

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