You are trying to break into a highly classified top-secret mainframe computer with highest security system in place at Merclyn Barley Bank located in Los Angeles. You know that conventional hacking d

Purchasing zero-day exploits is expensive and unreliable, and a specific exploit for a particular high-security mainframe configuration may not exist, making it far less practical than targeting human insiders.

Social engineering exploits the human element rather than technical vulnerabilities, making it effective even when all technical controls are in place. A poorly-paid or disgruntled bank employee may willingly or unwittingly reveal credentials, access procedures, or sensitive information when approached casually in a social setting. This technique, known as elicitation or pretexting, bypasses firewalls, IDS, and all other technical safeguards entirely.

A DDoS attack against routers and firewalls would disrupt network availability but would not grant unauthorized access to the internal mainframe system itself.

A Man-in-the-Middle attack requires the ability to intercept network traffic, which is unlikely to be feasible against a physically isolated and highly secured mainframe environment.