What is the different between these rsync command

[Yue Davis]

I use the following command initially for a Rsync between Windows and Linux

rsync -rvu -e ssh /cygdrive/c//folder user at linux.host.com:/home/public

I was asked for user at linux.host.com's password. I type the password and the
process continue and success.
Then I change the command to (without "-e ssh")

rsync -rvu /cygdrive/c//folder user at linux.host.com:/home/public

I was also asked for user at linux.host.com's password. I type the password and
the process continue and success.
Then I change the command to (without "-e ssh" and "user")

rsync -rvu -e ssh /cygdrive/c//folder linux.host.com:/home/public

This time I was asked for Windows_user_name at linux.host.com's password
because the same user account does not exit on the Linux machine I am unable
to log in.

I would like to know why attempt one and two's result looks identical? For
attempt two without the "-e ssh" how secure is rsync transferring the data?
Is it ssh or just plain binary or ASCII transfer?
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