Which of these recommended designs provides the highest availability?
A.
map the Layer 2 VLAN number to the Layer 3 subnet
B.
control route propagation to edge switches using distribute lists
C.
use a Layer 2 distribution interconnection link with HSRP or GLBP
D.
use a Layer 3 distribution interconnection link with HSRP or GLBP
E.
use equal-cost Layer 3 load balancing on all links to limit the scope of queries in EIGRP
In some other damps the answer for this question in D.use a Layer 3 distribution interconnection link with HSRP or GLBP. what exactly is the true answer?
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The answer is D. Availability is defined in the question so the answer has to map to the use of the service for the user-group/s under various fault conditions.
Mapping VIDs to subnets is a just a way of keeping the administration clean.
Having a fast recovery mechanism (HSRP/GLBP/VRRP) for a FH failure with a fast recovery mechanism (routing with tuned timers/BFD) means this service will be available for use for longer than without them.
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