Cisco 200-105 Exam

Which type of EIGRP route entry describes a feasible successor?

  • A. a backup route, stored in the routing table
  • B. a primary route, stored in the routing table
  • C. a backup route, stored in the topology table
  • D. a primary route, stored in the topology table
Answer: Option C.
Explanation: 

http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080093f07.shtml

Feasible Successors –
A destination entry is moved from the topology table to the routing table when there is a feasible successor. All minimum cost paths to the destination form a set.
From this set, the neighbors that have an advertised metric less than the current routing table metric are considered feasible successors.
Feasible successors are viewed by a router as neighbors that are downstream with respect to the destination.
These neighbors and the associated metrics are placed in the forwarding table.
When a neighbor changes the metric it has been advertising or a topology change occurs in the network, the set of feasible successors may have to be re- evaluated. However, this is not categorized as a route recomputation. Feasible successor is a route whose Advertised Distance (AD) is less than the Feasible
Distance (FD) of the current best path. A feasible successor is a backup route, which is not stored in the routing table but, stored in the topology table.

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