A proxy server. A system requests information from the internet, and that traffic is routed through the proxy server before arriving to the requesting system.
This is why proxy servers are used for hiding identity and being more secure, as internet traffic would show the IP address of the proxy server, and not the requesting system, though this often depends on the type of proxy server, as some proxy server's main objective isn't anonymousity, but rather efficiency.
I guess the correct answer is leases.
With DHCP, a device borrows, or leases an IP address while it is attached to the network.
Answer:
Assuming an upstander is someone that opposes cyberbullying:
(1) Call them out
(2) Report the behavior to proper moderation authority
(3) Tell the person to block messages from the cyberbully
I don't really know what else you want from this.
Cheers.
