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I disagree with the answer sheet! For a SINGLE command with no arguments mtr is a better answer than netstat. However, netstat is NOT just a Linux command and is much more powerful than mtr.
Netstat provides information about most of the 'nix networking subsystem(s). The type of information printed is controlled by the argument(s) used.

Please refer to:
http://linux.about.com/od/commands/l/blcmdl8_netstat.htm

for detailed information on the currently available arguments.

Merlin