Cisco ACI (Application Centric Infrastructure) is a platform that provides organization-wide automation, security, policy enforcement, and agility across wired and wireless networks. Cisco ACI is a software-defined networking (SDN) solution that allows administrators to manage network resources and policies through a centralized interface, simplifying network management and enabling organizations to respond quickly to changing business needs. It provides a comprehensive set of capabilities for automating and securing networks, including policy-based automation, network segmentation, and security analytics. In the other hand, Cisco DNA Center is a network management platform that provides automation, assurance, and analytics for Cisco enterprise networks.
https://networkinterview.com/cisco-dna-digital-network-architecture/
Cisco DNA
Intuitive and control centre providing a centralized management dashboard of controller-based automation, network wide assurance and open platform extensibility
Policy – Network policies which govern the functionality of the network
Automation – designing, provisioning, and configuration management is simplified
Analytics – Network assurance is improved
Security – provides network visibility and security analytics as part of SD-Access solution to control network wide access, enforcement of security policies etc.
Open Platform – 360-degree extensibility to enable easy data and intelligence exchange with external applications
Netacad
SD-WAN
It uses a secure cloud-delivered architecture to centrally manage WAN connections.
It simplifies and accelerates delivery of secure, flexible and rich WAN services to connect data centers, branches, campuses, and colocation facilities.
For me B, based in th concepts
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