What type of attack is most commonly associated with successful replay attacks?

Successful replay attacks are most commonly associated with on-path attacks. In this context, an on-path attack allows an attacker to intercept and capture the communication between two parties. By doing so, they can later retransmit (or "replay") legitimate messages or transactions to make unauthorized actions or impersonate a user.

This type of attack exploits the fact that certain communication protocols do not adequately protect against the reuse of valid messages. An attacker captures packets over the network, then reuses them later to manipulate the session or perform functions that the original sender intended. Since the attack relies on intercepting legitimate data, on-path attacks are integral to executing successful replay attacks.

The other types of attacks listed in the options, such as denial-of-service, brute-force, and phishing attacks, do not fundamentally rely on intercepting and duplicating communication to achieve their objectives, making them less relevant in the context of replay attacks. Denial-of-service aims to disrupt service availability, brute-force focuses on breaking passwords through repeated attempts, and phishing is aimed at deception to acquire sensitive information. Thus, these attack methods do not align with the mechanics and objectives of replay attacks as seen in on-path scenarios.