Final answer:
IP spoofing is the practice of sending packets with a false IP source address, often used in cyber attacks to disguise the sender's identity.
Step-by-step explanation:
Sending packets with false IP source addresses is referred to as IP spoofing. This technique is often used in cyber attacks to mask the origin of the attack and to deceive the target or monitoring tools. It exploits the trust a network might have in the packet's source IP address, bypassing IP-based security mechanisms. The attacker sends packets to a computer with an IP header containing a false source IP address, which can make the data appear to come from a trusted source, potentially leading to unauthorized access or information leakage.