ARP poisoning allows an attacker to send forged ARP (Address Resolution Protocol) messages to a local area network. This results in the linkage of an attacker's hardware identifier with the IP of a legitimate computer or server on the network; usually, the gateway. Consequently, traffic that was meant for that IP will instead go to the attacker. Spoofing a network address would not inherently redirect another device's traffic to the attacker's system. A denial-of-service attack is intended to disrupt services rather than intercept or manipulate traffic. DNS cache poisoning involves corrupting the DNS resolver cache, which would affect the resolution of domain names to IPs, not the direct redirection of data packets at the link layer.