Why can I see other traffic at switch environment just tcpdump?

["SB CH" <chulmin2 () hotmail com>]

Hello, all

I have operated linux server at switch environment,
and just with tcpdump, I can see some other traffic whic is not related 
with me without any other tool or trick.

it means that I can sniff traffic without special sniffing tool at the 
switch , right? is it possible?
but it's ture.

for example, 

# tcpdump port 80
15:03:42.681171 eth0 P 211.47.130.114.1131 > 211.47.1.55.www: S 
my system has no relations with 211.47.130.114 or 211.47.1.55.
just switch connected together with 211.47.1.55.


Thanks in advance.


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