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?
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.