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Cisco hierarchical model - WAN, Internet access

Just a quick question, if you have a 3 layer Crisco hierarchical model, with a WAN connection (e.g. frame relay, ppp) to another office - how can u make the core layer redundant, as I can assume, that my WAN connection and Internet connection will be at the Core layer?
Lets say I bought a Frame relay link, how can I make it redundant :-)
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>as I can assume, that my WAN connection and Internet connection will be at the Core layer?
Typically your wan link will connect to the distribution layer and not the core; the core assuming utilizing OSPF and area 0 (Transit), the core backbone is used to connect other major departments: Engineering, Manufacturing, Corporate, etc.

Assuming a major department such as Engineering, you might have remote offices of Network Engineers or Sales engineers that will have a CPE device with dual WAN connections, connecting back to the distribution layer of the Engineering network.

If this is a collapsed core (Distribution and Core combined into the same device), then one WAN connection would connect to core1 and the other connection would connect to core2.

Here are many examples:

m1979Author Commented:
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