  In this paper, analytical arguments are presented that there exists a
synchrotron X-ray jet on large scales in most radio-loud AGNs, based on the
knowledge of the nature and physics of blazars. In blue blazars and
blue-blazar-like radio galaxies, the large scale X-ray jet may get faint along
the jet, while in most red blazars and red-blazar-like radio galaxies, the
X-ray jet is bright on 10 kpc scales whether the jet is highly relativistic on
large scales or not. In extreme red blazars in which the jet is still highly
relativistic on large scales and the synchrotron peak of the inner jet lies in
the infrared bands, the X-ray jet may get fainter along the jet from 10 kpc to
100 kpc scales while the optical and IR jet gets brighter. The predictions can
be tested with the ongoing observations of the Chandra X-ray Observatory.
