NFV Interview Questions And Answers

Top 25 NFV Interview Questions And Answers For Experienced 2019. If you are looking for interview questions on NFV with answers, then you are at right place. Here codingcompiler sharing a list of 25 real-time Network Function Virtualization interview questions. These interview questions for network consultants will help to crack your next NFV job interview. Happy learning and all the best for your future.

NFV Interview Questions

  1. What is a Network Function Virtualization (NFV)?
  2. What is the main goal of using NFV?
  3. How proprietary hardware can be integrated in NFV?
  4. What kind of hardware can be used in NFV?
  5. What problems that NFV (Network Functions Virtualization) addresses?
  6. How can you use NFV (Network Functions Virtualization)?
  7. How does NFV (Network Functions Virtualization) work?
  8. What is NFVI (NFV Infrastructure)?
  9. What is NFVI Infrastructure Manager (VIM)?
  10. Can you give some examples for VIM?

NFV Interview Questions And Answers

1) What is a Network Function Virtualization (NFV)?

A) Network Functions Virtualization, abbreviated to NFV. NFV follows the concept of providing software-based network functions on standardized hardware, as traditionally provided by vendor-specific devices such as routers or switches.

The concept of Network Functions Virtualization (NFV) was first introduced in 2012 by some network service providers at the SDN and OpenFlow World Congress. NFV is driven by the ETSI Industry Specification Group (ISG) for Network Functions Virtualization.

2) What is the main goal of using NFV?

A) The main goal of NFV is to minimize the use of proprietary hardware in networks. Devices such as routers , switches , load balancers or firewalls can be hosted on virtual machines and servers thanks to NFV. Together with the concept of software-defined networking, networks become even more flexible, scalable and agile, and can be realized more cost-effectively with standard hardware and software.

3) How proprietary hardware can be integrated in NFV?

A) The individual functions of the proprietary hardware are integrated in NFV on a uniform, virtualized platform and controlled by software. It creates an enormous flexibility, which allows to implement new services quickly and with little effort. Above all, NFV is of interest to service providers who want to adapt their services to the requirements of the market within a very short time.

4) What kind of hardware can be used in NFV?

The standard hardware used is vendor-independent, multi-client capable, virtualizable and replaces expensive proprietary stand-alone solutions. NFV is in close contact with SDN and unfolds its full flexibility in interaction. The hardware and the forwarding plane can be controlled in Network Functions Virtualization using the OpenFlow communication protocol.

5) What problems that NFV (Network Functions Virtualization) addresses?

A) The desire to automate the orchestration and management of network, storage, and compute resources is a major driver of NFV and SDN development.

Imagine a scenario with a physical server with 10 virtual machines or hundreds of containers. This concept would simply not be scalable in a manual operation. With automation, you can quickly enable or destroy virtualized network features (VNF) such as virtual machines, containers, routers, firewalls, and IPS (intrusion prevention systems) to flexibly scale and tailor your network capabilities to meet dynamic demand.

6) How can you use NFV (Network Functions Virtualization)?

A) NFV provides greater agility in delivering network services with capital efficiency by eliminating the inevitable bottlenecks of manual processes and delivering new services as needed. With NFV, service providers can deliver services faster, more efficiently, and leverage automation to adapt to their scalability and agility needs.

7) How does NFV (Network Functions Virtualization) work?

A) NFV’s modular architecture allows service providers to automate at every level. The most important components of the architecture are,NFVI, VNF and MANO.

8) What is NFVI (NFV Infrastructure)?

A) NFVI (NFV Infrastructure) – Provides the virtualization layer (hypervisors or container management systems such as Docker) and the physical computing, storage, and networking components that host VNF.

9) What is NFVI Infrastructure Manager (VIM)?

A) NFVI is managed through the NFVI Infrastructure Manager (VIM), which controls the allocation of resources to the VNF.

10) Can you give some examples for VIM?

A) OpenStack is an example of an open source VIM that controls physical and virtual resources. VMWare is an example of a commercial VIM.

Advanced NFV Interview Questions For Experienced

11) What is Virtualized Network Function (VNF)?

A) A virtualized network function (VNF) is a software application used in a Network Functions Virtualization (NFV) implementation that has well defined interfaces, and provides one or more component networking functions in a defined way. For example, a security VNF provides Network Address Translation (NAT) and firewall component functions.

12) What is the use of VNF?

A) VNF: Software-based applications that provide one or more network services. VNF leverages the NFVI-provided virtualized infrastructure to connect to the network and provide programmable, scalable network services. VNF Managers support the lifecycle of VNF instances and the management of VNF software.

13) What is the use of Management and Orchestration (MANO)?

A) Management and Orchestration (MANO) enables the comprehensive management and orchestration of the VNF in the NFV architecture. MANO instantiates the network services by automating, provisioning, and coordinating workflows to the VIM and VNF managers that instantiate the VNF and overlay network service chains. MANO connects the NFV architecture with the existing OSS / BSS.

14) What are the network features that can be virtualized by NFV?

Here are the network features that can be virtualized by NFV:

  • Exchange element
  • Mobile network node
  • Home routing operation
  • Set-top box business
  • Tunnel gateway element
  • Traffic Analysis
  • Service guarantee
  • SLA monitoring
  • Testing and diagnosis
  • NGN signal
  • Aggregation and network-wide capabilities
  • Application optimization
  • Security function

15) NFV vs SDN – What is the difference between NFV and SDN?

A) NFV and SDN – When it comes to network virtualization, most people think of software-defined networking (SDN). NFV and SDN are separate. Both technologies are designed to increase flexibility, reduce costs, support scalability, and accelerate the introduction of new services. But you can run one of them separately.

However, NFV and SDN are complementary, and SDN makes NFV applications simpler and more efficient, providing flexibility and streamlining operations by improving performance. In particular, using SDN to support NFV can help traffic steering (unloading, bypassing, selecting, etc.), dynamically expanding and shrinking, multi-tenancy, and load balancing.

SDN can help NFV accomplish tasks such as policy-managed forwarding and dynamic service provisioning. Conversely, the need for SDN can also be increased by using dynamic virtual overlays and multi-tenant NFVs.

16) What are the real-world examples of NFV?

A) The two major real-world examples of NFV are the construction of virtual devices (vCPE) and packet switched LTE in mobile networks.

17) Can you explain the NFV architecture?

A) NFV main framework:

Infrastructure hardware resources and corresponding virtualization

Management and Orchestration (MANO), by Coordinator, Virtual Network Function Management (VNFM) and Virtual Infrastructure Management (VIM)

Virtual Network Management System (EMS) functions and corresponding elements

Operational support system and business support system (OSS/BSS)

18) What is MANO, what does it contain and what are the responsibilities?

A) The combination of NFVO, VIM, and VNF administrators is often referred to as MANO, which is responsible for initializing and setting up new network services, network service lifecycle management, global resource management, authentication and authorization requesting NFVI, and NS policy management.

19) What is VNF administrator and it’s responsibilities?

A) The VNF administrator is responsible for lifecycle management of VNF instances, coordinating NFVI and EMS. VIM’s responsibilities, such as the OpenStack community, are well understood, namely, control, management, monitoring, NFVI computing storage, and network resources.

20) What is the use of OSS/BSS in NFV architecture?

A) In the NFV architecture, the OSS/BSS system will primarily interact with NFVO to manage network services. Over time, by introducing virtualization, the OSS/BSS system may eventually manage more and more entities.

21) What is the difference between VNF and NFV?

A)  A Virtualized network function (VNF) is a software application used in a Network Functions Virtualization (NFV) implementation that has well defined interfaces, and provides one or more component networking functions in a defined way. For example, a security VNF provides Network Address Translation (NAT) and firewall component functions.

NFV follows the concept of providing software-based network functions on standardized hardware, as traditionally provided by vendor-specific devices such as routers or switches.

22) What is the relationship between VNF and VM?

A) In a Network Functions Virtualization architecture, a virtualized network function, or VNF, is responsible for handling specific network functions that run in one or more virtual machines on top of the hardware networking infrastructure, which can include routers, switches, servers, cloud computing systems and more.

23) What is NFV orchestration?

A) Network functions virtualization (NFV) Orchestration (or NFV Orchestration) is used to coordinate the resources and networks needed to set up cloud-based services and applications. This process uses a variety of virtualization software and industry-standard hardware.

24) What is OpenStack Tacker?

A) Tacker is an official OpenStack project building a Generic VNF Manager (VNFM) and an NFV Orchestrator (NFVO) to deploy and operate Network Services and Virtual Network Functions (VNFs) on an NFV infrastructure platform like OpenStack.

25) What is ETSI NFV?

A) ETSI NFV is part of the European Telecommunication Standards Institute (ETSI), an independent standardization organization, that has been instrumental in developing standards for information and communications technologies (ICT) within Europe.

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