mount -t cifs //data/Shared /mnt/Shared -o uid=1000,gid=1000,user=<my_windows_account_name>,dom=<my_domain>,pass=

# As root...
cat >/usr/local/etc/Shared.cifs <<'X'
username=my_windows_account_name
domain=my_domain
password=my_windows_password
X
chmod u=rw,go= /usr/local/etc/Shared.cifs
chown my_unix_account_name:root /usr/local/etc/Shared.cifs

# Then mount becomes
mount -t cifs //data/Shared /mnt/Shared -o credentials=/usr/local/etc/Share.cifs,noperm

net ads testjoin
getent password my_windows_account_name    # As above
getent group "domain admins"               # An example group that will exist