27 A hacker sends traffic indicating that a target IP address should be matched with the attacker's own MAC address. This form of spoofing causes network computers to cache incorrect information and communicate with the hacker rather than the target IP address. Which type of exploit is being perpetrated? Buffer overflow ARP poisoning o Ping flood Denial-of-service 28 A network design engineer has decided to use fiber optic cable to connect the networks in two different buildings on the same property. Which security threat is reduced by this decision, other than increased bandwidth and supported distance? Port scanning Spoofing Buffer overflow Wiretapping 29 A client programs software with a variable that can hold 128 bytes. An attacker injects more than 128 bytes into the variable, which causes the software to fail. Which type of attack has occurred? Buffer overflow Social engineering Port scanning Brute force