Questions for the BL0-220 were updated on : Nov 21 ,2025
Select the word that best completes the following sentence.
The Core or Central Cloud covers a very large___.
B
Explanation:
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 facility12
. Reference:
Nokia Bell Labs 5G Professional Certification - Distributed Cloud Networks
Nokia Bell Labs 5G Certification Program - Courses
The ETSI MANO Model operational stack is defined as?
B
Explanation:
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: Orchestration 2:
Module by Module - Self Study Note Guide - training2
Select the option that best completes the following sentence.
____is a key component in the Closed loop automation.
A
Explanation:
A Policy Database is a key component in Closed Loop Automation. It stores the policies that govern
the automated decision-making processes within a system. These policies define the actions to be
taken in response to specific events or conditions, enabling the system to automatically adjust its
operations without human intervention, thus increasing efficiency and responsiveness.
Which of the following is the mandatory key driver to consider for Cloud RAN/vRAN deployment?
B
Explanation:
Low latency is the mandatory key driver to consider for Cloud RAN/vRAN deployment. Cloud RAN
stands for Cloud Radio Access Network, which is a network architecture that centralizes the
baseband processing of multiple radio sites in a cloud platform. vRAN stands for virtualized RAN,
which is a network architecture that implements the baseband processing as software functions
running on virtual machines or containers in a cloud platform. Both Cloud RAN and vRAN aim to
improve the performance, efficiency, and flexibility of the radio access network by leveraging cloud
technologies. Low latency refers to the minimal delay between the source and the destination of a
data transmission, which affects the quality of service and user experience for various applications.
Low latency is a critical requirement for Cloud RAN/vRAN deployment, as it ensures the timely and
reliable delivery of radio signals between the centralized cloud platform and the distributed radio
sites. Low latency also enables Cloud RAN/vRAN to support new 5G use cases that demand ultra-
reliable and low-latency communications, such as autonomous driving, remote surgery, and
industrial automation. Reference:
Nokia Bell Labs 5G Professional Certification - Distributed Cloud
Networks
, Unit 3: Cloud Resource Planning, Section 3.2: Cloud RAN/vRAN.
Low latency is a mandatory key driver for Cloud RAN/vRAN deployment due to the stringent
requirements of real-time communication and processing in radio access networks. Low latency
ensures that data transmission and processing occur with minimal delay, which is crucial for
supporting high-speed, reliable communication necessary in modern wireless networks, especially
with the advent of 5G technologies.
Kubemetes is a:
B
Explanation:
Kubernetes is an orchestrator, which is a software system that automates the deployment, scaling,
and management of containerized applications1
.
Kubernetes allows users to define the desired state
and configuration of their applications, and then ensures that the actual state matches the desired
state2
.
Kubernetes also provides features such as service discovery, load balancing, storage
management, and self-healing3
.
Therefore, option B best describes Kubernetes, while options A, C,
and D are incorrect. Reference: 1
:
Nokia Bell Labs Distributed Cloud Networks, Unit 2: Cloud
Technologies and Features, Topic: Microservices and Containerization 2
:
What is Kubernetes? |
Kubernetes, Overview 3
:
Kubernetes - an overview | ScienceDirect Topics
, Overview
In public networks, what are the parts of a distributed cloud used for the 5G Core control plane.
(Select 2)
A, B
Explanation:
The 5G Core control plane is responsible for managing the network functions, services, and
resources, such as authentication, authorization, session management, policy control, mobility
management, etc.1
.
The 5G Core control plane can be deployed in a distributed cloud architecture,
which consists of different cloud layers that have different characteristics and roles2
.
The Metro Edge
Cloud is a cloud layer that is located near the access network, and provides low latency, high
bandwidth, and local processing for the control plane functions3
.
The Core/Central Cloud is a cloud
layer that is located in the core network, and provides high availability, scalability, and security for
the control plane functions4
.
The distributed cloud architecture enables the 5G Core control plane to
optimize the network performance, efficiency, and flexibility, and to support various use cases and
applications. Reference: 1
:
Nokia Bell Labs Distributed Cloud Networks, Unit 1: Cloud Ecosystem,
Section 1.2: Cloud Architecture 2
:
Nokia Bell Labs Distributed Cloud Networks, Unit 1: Cloud
Ecosystem, Section 1.3: Distributed Cloud 3
:
Nokia Bell Labs Distributed Cloud Networks, Unit 3:
Cloud Resource Planning, Section 3.2: Cloud Resource Planning for Distributed Cloud 4
:
Nokia Bell
Labs Distributed Cloud Networks
, Unit 3: Cloud Resource Planning, Section 3.3: Cloud Resource
Planning for Central Cloud :
Nokia Bell Labs Distributed Cloud Networks
, Unit 5: New Services
Automation, Section 5.1: Distributed Cloud Services Automation
Select the best option below to complete the following sentence.
Your apps need cloud resources which are______and then__
B
Explanation:
Your apps need cloud resources which are allocated and then provisioned.
Allocation is the process
of assigning cloud resources to a specific app or service, based on the requirements and
availability1
.
Provisioning is the process of configuring and activating the allocated cloud resources,
making them ready to use by the app or service2
. Commissioning, instantiation, starting, and
distribution are not the correct terms to complete the sentence.
Commissioning is the process of
testing and verifying the cloud resources before they are allocated3
.
Instantiation is the process of
creating an instance of an app or service, which is a running copy of the app or service that uses the
provisioned cloud resources4
. Starting is the process of launching an instance of an app or service,
which can be done manually or automatically. Distribution is the process of spreading the cloud
resources across different locations or domains, to achieve scalability, redundancy, or performance.
Termination is the process of deleting or releasing the cloud resources that are no longer needed by
the app or service.
Reference: 1: Nokia Bell Labs Distributed Cloud Networks, Unit 3: Cloud Resource Planning, slide 8 2:
Nokia Bell Labs Distributed Cloud Networks, Unit 3: Cloud Resource Planning, slide 9 3: Nokia Bell
Labs Distributed Cloud Networks, Unit 3: Cloud Resource Planning, slide 10 4
: Nokia Bell Labs
Distributed Cloud Networks, Unit 3: Cloud Resource Planning, slide 11 : Nokia Bell Labs Distributed
Cloud Networks, Unit 3: Cloud Resource Planning, slide 12 : Nokia Bell Labs Distributed Cloud
Networks, Unit 3: Cloud Resource Planning, slide 13 : Nokia Bell Labs Distributed Cloud Networks,
Unit 3: Cloud Resource Planning, slide 14
Which of the following is the most efficient service concept for resource usage?
C
Explanation:
The “Stateless” service concept is indeed the most efficient for resource usage. In a stateless
architecture, each request is treated as an independent transaction, unconnected to any previous
request. This means that no state information is stored between transactions, which simplifies the
design and scalability of systems. It allows for better resource utilization because there is no need to
maintain state information over time, which can be resource-intensive. This approach aligns with the
principles of RESTful services and is widely adopted in scalable web applications.
Reference: The concept of stateless services is a fundamental principle in distributed systems design,
as discussed in the Nokia Bell Labs Distributed Cloud Networks learning resources. It is emphasized
for its benefits in scalability and resource optimization.
What are the two main options to interconnect private and public clouds? (Select 2)
B, C
Explanation:
The two main options to interconnect private and public clouds are VPN and WAN. VPN stands for
Virtual Private Network, which is a secure and encrypted connection between two or more networks
over the public internet. VPN allows private and public clouds to communicate with each other
without exposing their data or traffic to third parties. WAN stands for Wide Area Network, which is a
network that spans a large geographic area, such as a country or a continent. WAN allows private
and public clouds to interconnect across different regions or locations, using high-speed and high-
capacity links. Both VPN and WAN provide reliable, scalable, and flexible solutions for hybrid cloud
scenarios, where private and public clouds work together to deliver optimal performance and
efficiency. Reference:
Nokia Bell Labs 5G Professional Certification - Distributed Cloud
Networks
,
Cloud Data Center Interconnect for Large Enterprises
,
5G Core on cloud: go public, private
or a bit of both?
Network Function Management provides: (Select 2)
A, C
Explanation:
Single and consistent point of management. Comprehensive Explanation and Reference of Correct
Answer: Network Function Management provides different network slices for
Explanation:different companies and a single and consistent point of management.
Network slicing is
a technique that allows the creation of multiple logical networks on top of a shared physical
infrastructure1
.
Each network slice can have its own characteristics, requirements, and services,
tailored to the needs of different customers or applications1
.
Network Function Management is a
component that handles the configuration, monitoring, and optimization of the network functions
that compose each network slice2
.
It provides a single and consistent point of management for the
network functions, regardless of their location, type, or vendor2
. Multiple Orchestrators required for
deployments is not a correct option.
An Orchestrator is a component that coordinates the allocation
and release of resources for network services and network slices3
.
There are different types of
Orchestrators, such as NFV Orchestrator, NS Orchestrator, and Slice Orchestrator, but they are not
part of the Network Function Management3. Reference: 1: Nokia Bell Labs Distributed Cloud
Networks, Unit 5: New Services Automation, Section 5.1: Network Slicing 2: Nokia Bell Labs
Distributed Cloud Networks, Unit 5: New Services Automation, Section 5.2: Network Function
Management 3
: Nokia Bell Labs Distributed Cloud Networks, Unit 5: New Services Automation,
Section 5.3: Orchestration
What is the sequence of the evolution of Network Functions?
C
Explanation:
Physical Network Functions (PNFs) are the traditional network functions that run on dedicated
hardware appliances, such as routers, switches, firewalls, etc1
.
Virtual Network Functions (VNFs) are
the network functions that run on virtual machines (VMs) on top of a common hardware platform,
such as servers, storage, and network1
.
Cloud-Native Network Functions (CNFs) are the network
functions that run on containers orchestrated by Kubernetes on a cloud infrastructure1
.
The
evolution of Network Functions reflects the trend of moving from hardware-centric to software-
centric and cloud-based solutions, which offer more flexibility, scalability, and
efficiency12. Reference: 1
:
Nokia Bell Labs Distributed Cloud Networks, Unit 2: Cloud Technologies
and Features, slide 18 2
:
Nokia Bell Labs 5G Certification Program - Blended Learning
, Section 2:
Distributed Cloud Networks, slide 11
Which of the following statements is correct regarding monolithic applications?
C
Explanation:
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 Architectures 2
:
Monolithic Architecture 3
:
Microservices vs
Monolithic Architecture 4
:
Monolithic vs. Microservices Architecture
Select the best option below to complete the following sentence.
On-Boarding of a Network Service requires both____and____templates.
B
Explanation:
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.
Reference:
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.
Multitenancy in cloud computing defines?
B
Explanation:
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.
Which of the following best describes the networking concept of "Underlay"?
A
Explanation:
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
Networks 2
:
Module by Module - Self Study Note Guide, DC2.2– Cloud Options 3
:
Underlay Network
- an overview | ScienceDirect Topics
, Overview