Employing a technique where attackers gain a position between the sender and the receiver to capture or modify data as it is transmitted over a network is an instance of an on-path attack.
This statement is correct because an on-path attack, formerly known as a man-in-the-middle attack, involves an attacker positioning themselves in the communication channel between two parties, allowing them to intercept, read, or alter the transmitted data. This type of attack is specifically aimed at capturing data as it travels across a network, making it a critical security concern that needs to be mitigated.