CCNA is more like a foundation building certification. So it tends to cover a whole array of topics, but all at the basic level, just enough to give food for thought, and a fair level of understanding how each technology works. To cover MPLS would not have been appropriate in CCNA as MPLS needs the foundation as well as the routing level professional knowledge already in place..
But again with one level below CCNA certification, this may change probably, and they may cover light basics of MPLS. So that you can actually study the operations in professional and expert level certifications. Just a thought.
MPLS does not replace frame-relay or ATM. MPLS is implemented on top of your layer 2 technology (Frame Relay, ATM, Ethernet, etc.), not in place of it. In order to implement MPLS, you must have and understand the underlying layer 2 technology, which is covered in CCNA.
I like to look to this in a different prospective, MPLS VPNs with all its types is kind of replacing other overlay VPNs like FrameRelay, we need to differentiate between this and between frame-relay or ATM acting as the layer 2 technology over which MPLS is running.
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