Tcpdump is a command-line network sniffing and parsing tool ported to several platforms.
Wireshark is similar to tcpdump, but with a graphical user interface and many advanced sorting
and filtering options. TcpDump is very economical in terms of memory since its installation file
size is just 484 KB. TcpDump does not have a user friendly Graphical User Interface (GUI). So
the user has to study those commands and get acquainted with the command prompt like screen.