The "tcp" in "tcpdump" is historical; these days, it's a general-purpose
network analyzer. Don't claim tcpdump will not be of much use to you if
you don't know TCP.
\fI(N.B.:The following description assumes familiarity with
the TCP protocol described in RFC-793.
If you are not familiar
-with the protocol, neither this description nor \fItcpdump\fP will
+with the protocol, this description will not
be of much use to you.)\fP
.LP
The general format of a tcp protocol line is: