Dennis found that a system on his network sends hundreds of Ethernet frames to the switch it is connected to, with each frame containing a different source MAC address. Which type of attacks has he found?

MAC flooding attacks aim to flood a switch's CAM table, which can result in the switch broadcasting all traffic to every port, instead of directing it to the port associated with a particular MAC address. While this was feasible with many older switches, most contemporary switches are less vulnerable to this form of attack. Moreover, some switches have built-in security features that can thwart MAC flooding attacks.