netstat is a command-line network utility that displays network connections for Transmission Control Protocol, routing tables, and a number of network interface and network protocol statistics
kdump is a feature of the Linux kernel that creates crash dumps in the event of a kernel crash. When triggered, kdump exports a memory image that can be analyzed for the purposes of debugging and determining the cause of a crash….
Tcpdump is a packet analyzer program that runs under a command line interface. It allows the user to display TCP/IP and other packets being transmitted or received over a network .