Which of the following types of attacks come under the category of hacker attacks? Each correct answer represents a complete solution. Choose all that apply.

Smurf is a DDoS amplification attack that floods a victim with ICMP echo replies by broadcasting spoofed packets to a network - it is classified as a DoS/network flood attack, not a direct hacker attack in standard EC-Council taxonomy.

IP address spoofing is a core hacker attack technique where the attacker forges the source IP header in packets to impersonate another host, enabling identity masking, session hijacking, and bypassing IP-based access controls.

Teardrop is a DoS fragmentation attack that sends malformed, overlapping IP fragments designed to crash vulnerable TCP/IP stacks - it is categorized as a network-level DoS attack, not a hacker attack.

Password cracking is a direct hacker attack that targets authentication credentials using methods such as brute force, dictionary, or hybrid techniques to gain unauthorized system access.