MPLS vs VRF Lite

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I wonder if somebody can explain to me the technical reasons why one of the
 two designs below is more secure than the other. The whole idea behind the
 design is to create a network that will isolate traffic (separate and secu
re) for two organizations by using the same network infrastructure. Also, w
hat would the benefits and disadvantages be when selecting the one or the o
ther? Both designs use a three-layer network design model.

Design 1:
Core switch - using MPLS
Distribution switch- using MPLS
Access - using MPLS

Design 2:
Core switch- using MPLS
Distribution switch- using MPLS
Access switch- using VRF Lite

My understanding of MPLS or VRF Lite is pretty poor. I believe Design 2 may
 have less expensive Access switches and is not as secure as Design 1.  I w
ould like to understand what the technical reasons are for this. I am not r
eally a network person, so you may have to explain to me like I am two year

Any help will be greatly appreciated. Thank you in advance!


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