Explanation
SD-WAN demonstrations are an effective way to showcase the benefits and features of Cisco SD-WAN solutions to potential customers. However, not all demos are created equal, and there are some best practices to follow to ensure a successful and engaging demo. Here are some explanations for why C and E are true statements regarding SD-WAN demonstrations:
C: During a demo, you should consider the target audience and the desired outcome. This is a true statement because different audiences may have different levels of technical knowledge, business needs, and expectations from the demo. For example, a demo for a C-level executive may focus more on the business outcomes and value proposition of SD-WAN, while a demo for a network engineer may dive deeper into the technical details and configuration options. Therefore, it is important to tailor the demo to the specific audience and the desired outcome, such as generating interest, building trust, or closing a deal.
E: There is a big difference between demos that use a top down approach and demos that use a bottom up approach. This is also a true statement because the two approaches have different advantages and disadvantages, and may suit different scenarios. A top down approach starts with the high-level overview of the SD-WAN solution, such as the architecture, components, benefits, and use cases, and then drills down into the specific features and functionalities. A bottom up approach starts with the low-level details of the SD-WAN solution, such as the configuration, troubleshooting, and testing, and then builds up to the big picture and value proposition. A top down approach may be more suitable for a non-technical or business-oriented audience, while a bottom up approach may be more suitable for a technical or hands-on audience.
References :=
Cisco SD-WAN Demonstration Guide
SD-WAN Best Practices | Kentik Blog
SD-WAN best practices for a successful implementation
SD-WAN best practices - VMware Blogs

Explanation
The vBond orchestrator is an SD-WAN router responsible for authenticating and orchestrating connectivity between the vSmart controllers and SD-WAN routers. It is the sole device in the network that requires a public IP address for all SD-WAN devices to connect to it. The vBond orchestrator has three major functions:
Controller discovery: The vBond orchestrator acts as the initial point of contact for all SD-WAN components that join the network. It authenticates the devices using pre-installed credentials and assigns them to a vSmart controller. The vBond orchestrator also provides the IP addresses of the vSmart controllers and the vManage NMS to the SD-WAN routers.
NAT traversal: The vBond orchestrator facilitates the establishment of secure DTLS or TLS tunnels between the SD-WAN components that are behind NAT devices. The vBond orchestrator acts as a rendezvous point for the NATed devices and helps them exchange their public IP addresses and port numbers. The vBond orchestrator also performs NAT keepalive and hole punching to maintain the NAT bindings and prevent the NAT devices from timing out the sessions.
Certificate management: The vBond orchestrator acts as the certificate authority (CA) for the SD-WAN network. It generates and signs the certificates for the SD-WAN components and distributes them to the devices. The certificates are used to authenticate the devices and encrypt the control and data plane traffic.
References:
Cisco SD-WAN Architecture Overview
Cisco Catalyst SD-WAN Getting Started Guide
New Training: Identify Cisco SD-WAN Components