Which applications can help determine if a denial-of-service attack is occurring?

The correct choice involves using the netstat command and a packet sniffer to determine if a denial-of-service (DoS) attack is occurring.

The netstat command is a powerful tool for monitoring network connections, providing real-time information about network statistics, including active connections, the state of those connections, and various networking protocols being utilized. By analyzing this output, a network administrator can identify unusual connection patterns, such as a large number of requests from a single IP address, which might indicate a DoS attack.

A packet sniffer, on the other hand, is used to capture and analyze data packets transmitted over a network. With a packet sniffer, you can gain deeper insights into the traffic patterns and protocols being used. If there is a DoS attack, it will likely manifest as a significant increase in network traffic or malformed packets, which can be detected during packet analysis.

The other options do not provide the same level of utility for detecting a denial-of-service attack. The ps command lists running processes, which is less relevant in identifying network issues. A network scanner can assess devices on a network, but it would not specifically reveal patterns indicative of a DoS attack. The ping command can check the availability of a network host but may not