Refer to the exhibit. What is occurring in this packet capture?

A TCP port scan shows low-volume, sequential SYN packets targeting incrementally increasing destination port numbers to enumerate open services, not a flood of packets to a single port.

The packet capture shows an extremely high volume of TCP packets directed at a single destination in a short time window, which is the hallmark signature of a TCP flood attack. Unlike a port scan, the destination port remains constant, and unlike legitimate traffic, there is no corresponding application-layer exchange - the goal is resource exhaustion on the target host or network device.

A DNS flood uses high-volume UDP packets destined for port 53 to overwhelm a DNS resolver, which would not appear as TCP traffic in a packet capture.

DNS tunneling encodes data inside DNS query and response payloads, producing anomalously large or frequent DNS messages over UDP port 53, not a pattern of TCP flooding.