On LAN there can be many feature you can use to have complete redundancy like STP (Root Bridge and Secondary Root Bridge) , Etherchnnel between access and distribution and between distributon and core, also you can have uplink fast for fast convergence,
you can also run HSRP. So I am saying there are many features which are available to have complete redundancy.
On WAN interface you can implement Lease line and rame relays and isdn as backup or you can play around with your routing protocols and static routes for redundancy.
Now a days there are many features on IOS on LAN and WAN which can used for complete redundancy so if you are aware of the features you can design your network very well.
Besides the technology one incorporates in a design, don't forget the "Three P's" - people, procceses and procedures. System outages are more likely to be caused by a breakdown in one of those than from a technology shortfall or failure to avail oneself of the latest gee whiz tech feature. Unfortunately these 'soft' problems are often harder to address and don't always lend themselves to quick and easy solutions. I believ ethought that you will find attention paid to them will yield many availability returns on your investment.
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