Which of the following connections does not exist during the VNS bootstrapping process?

During the VNS bootstrapping process, the Network Services Gateway (NSG) initiates a connection to the NSG-Proxy. The Proxy, in turn, communicates with the Virtualized Services Directory (VSD) to authenticate the NSG and retrieve its configuration, including the address of its assigned Virtualized Services Controller (VSC). This information is relayed back from the Proxy to the NSG. Finally, the NSG establishes a direct OpenFlow-over-TLS control plane connection to the VSC. The VSC is a passive entity in the initial bootstrap phase and awaits the connection from the NSG; it does not initiate any communication with the NSG-Proxy.

A. Proxy to NSG: This connection is essential for the Proxy to send the bootstrap response (containing VSC information from the VSD) back to the NSG.
B. Proxy to VSD: This connection is used by the Proxy to forward the NSG's initial bootstrap request to the VSD for authentication and policy retrieval.
C. NSG to VSC OpenFlow-TLS: This is the primary control plane connection, established by the NSG after it successfully receives its configuration via the bootstrap process.

1. Nokia Nuage Networks VNS User Guide, Release 20.10.R1, Section: "NSG bootstrap process". This section details the communication flow, stating, "The NSG sends a bootstrap request to the NSG bootstrapping service... The NSG bootstrapping service forwards the request to the VSD... The VSD sends a response... The NSG bootstrapping service forwards the response to the NSG... The NSG establishes an OpenFlow session with the VSC." This flow explicitly omits any VSC-to-Proxy communication.

2. Nokia Nuage Networks VSP Fundamentals Guide, Release 20.10.R1, Chapter: "Virtualized Network Services (VNS)", Section: "NSG activation". The architectural diagrams and process descriptions in this section illustrate that the VSC's role begins after the NSG has been directed to it by the VSD via the proxy. The VSC does not interact with the proxy.