What is the best solution for deploying an optimal network function distribution?

The optimal distribution of network functions is achieved by leveraging a distributed cloud architecture. This involves placing Virtual Network Functions (VNFs) across multiple, geographically dispersed cloud data centers—from the central core to the network edge. A crucial component of this model is an orchestration platform, which automates the lifecycle management of these VNFs. The orchestrator intelligently places, scales, and heals VNFs based on real-time network conditions, service requirements (e.g., latency, bandwidth), and resource availability. This orchestrated, multi-site approach ensures optimal performance, high availability, and resource efficiency, which is the central goal of Network Function Virtualization (NFV) in modern telecommunications.

A. Using duplicated Virtual Network Functions Duplication is a technique for achieving high availability and redundancy, not a comprehensive strategy for optimal distribution. It is a component, not the complete solution.
B. Using Virtual Network Functions to control the routing This describes a specific application of a VNF (i.e., a virtual router). It does not address the broader strategic question of how to best distribute various network functions across the network.
D. Using Virtual Network Functions in Access Placing VNFs in the access network (edge computing) is part of an optimal strategy for low-latency services, but it is not the complete solution. An optimal network requires a mix of functions at the edge, regional, and core data centers.

1. Nokia Official Documentation: Nokia, "CloudBand Application Manager Datasheet." This document describes how the CloudBand platform provides "automated, generic VNF and CNF lifecycle management from a single pane of glass across any cloud environment." It emphasizes the orchestration capabilities across distributed cloud locations (core, edge) to optimize service delivery, which directly supports the concept of orchestrating VNFs across various data centers.

2. Nokia Official Documentation: Nokia, "The move to a distributed, multi-cloud world," White Paper. This paper discusses the evolution towards distributed cloud architectures in telecommunications. Section 3, "The distributed cloud," explains that service providers are deploying cloud infrastructure in a distributed manner, from central data centers to the far edge, and that a common orchestration and management layer is essential to "place workloads in the optimal location."

3. Academic Publication: Taleb, T., Samdanis, K., Mada, B., Flinck, H., Dutta, S., & Sabella, D. (2017). "On Multi-Access Edge Computing: A Survey of the Emerging 5G Network Edge Cloud Architecture and Orchestration." IEEE Communications Surveys & Tutorials, 19(3), 1657-1681. Section IV.A, "NFV for MEC," details how NFV Management and Orchestration (MANO) is fundamental for deploying VNFs at the network edge. The paper highlights that the NFV Orchestrator (NFVO) is responsible for the "optimal placement of VNFs" across the distributed infrastructure, reinforcing the necessity of orchestration across various locations. DOI: https://doi.org/10.1109/COMST.2017.2705720