Final answer:
A C2 server for performing a DDoS with a botnet is best set up using IRC, which enables anonymized machine-to-machine communication and allows botnet operators to control multiple systems simultaneously.
Step-by-step explanation:
To perform a DDoS (Distributed Denial of Service) attack with a botnet, it is useful to set up a Command and Control (C2) server via c) IRC (Internet Relay Chat), which allows machine-to-machine communication in an anonymized manner. The use of IRC is traditional in the management of botnets because it supports many simultaneous connections and can be utilized for issuing commands to a fleet of compromised machines, or 'bots'. Various networks can be targeted for a DDoS attack, including web platforms, causing substantial disruption by overwhelming the target with traffic from multiple sources.