9.1.Single points of failure
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If the failure of a single network device or link (for example, a switch, router, or WAN connection) would result in a network becoming unavailable, that single device or link is a potential single point of failure.
To eliminate single points of failure from your design, you might include redundant links and redundant hardware.
For example, some highend Ethernet switches support two power supplies, and if one power supply fails, the switch continues to operate by using the backup power supply.
Link redundancy, as shown in Figure below , can be achieved by using more than one physical link. If a single link between a switch and a router fails, the network would not go down because of the link redundancy that is in place.
