Which routing protocol uses successor and feasible successor?

Which of the following routing technologies uses a successor and a feasible successor?

  1. IS-IS
  2. OSPF
  3. BGP
  4. EIGRP Source Reference Answer

Community Votes

D
100%

100% of anonymous learners picked answer D. Votes are pick records left by other test-takers — they are not the verified answer.

Community Insight

The question tests recognition of EIGRP-specific Diffusing Update Algorithm terminology, with the trap being to confuse EIGRP with OSPF or IS-IS.

EIGRP is the routing protocol that uniquely uses successor and feasible successor terms for loop-free path selection. Community consensus confirms D as correct for the N10-009 exam.

Choosing OSPF is a common mistake because OSPF is a well-known link-state protocol, but it uses SPF trees and LSA types, not successor/feasible successor.

Community Discussion (3 comments)

LadyBirdArchitect 👍 1 Selected: D
D. EIGRP In EIGRP, a successor is a primary route to a destination network, chosen based on having the best metric. The successor route is actively used to forward traffic to the destination network. If the successor becomes unavailable, EIGRP uses a backup route called a feasible successor.
HeatSquad77 👍 2 Selected: D
D. Enhanced Interior Gateway Routing Protocol (EIGRP) Cisco’s proprietary hybrid protocol that has elements of both distance vector and link state routing.
TreyPar3 👍 3
The routing technology that uses the concepts of a successor and a feasible successor is Enhanced Interior Gateway Routing Protocol (EIGRP). EIGRP is a Cisco-proprietary routing protocol that uses these terms in its Dual (Diffusing Update Algorithm) to ensure efficient and loop-free path selection.

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Expert Analysis

Why the Answer Is Correct

EIGRP, a Cisco-proprietary hybrid protocol, uses the terms successor and feasible successor within its DUAL algorithm. A successor is the primary route with the best metric, while a feasible successor is a backup route that meets feasibility conditions, ensuring loop-free failover. This unique terminology is not used by IS-IS, OSPF, or BGP.

Why the Other Options Are Wrong

IS-IS and OSPF are link-state protocols that build a complete topology database and calculate shortest paths using Dijkstra; they do not maintain successor/feasible successor relationships. BGP is a path-vector protocol that selects best paths and may use multipath, but it does not use feasible successors. Only EIGRP has these specific DUAL concepts.

Community Comment Notes

Comment [1] correctly explains that EIGRP uses successor and feasible successor in DUAL to ensure efficient, loop-free path selection. Comment [2] adds that EIGRP is a hybrid distance-vector/link-state protocol. Comment [3] reinforces that the successor is the active route and the feasible successor is the backup route. All community votes were for D, aligning with the correct answer.

Official Reference

Exam Strategy

Memorize protocol-specific buzzwords: EIGRP = DUAL, successor, feasible successor; OSPF = LSA, DR/BDR, SPF; IS-IS = TLV, DIS; BGP = AS-path, path attributes. When you see unique terms like these, identify the protocol first, then verify its characteristics.

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