nerdexam
Cisco

350-401 · Question #1207

How do OSPF and EIGRP compare?

The correct answer is C. EIGRP shows successor and feasible successor routes, and OSPF shows all known routes.. EIGRP uses successor and feasible successor routes for redundancy, while OSPF maintains a comprehensive topological database to calculate the best path.

Submitted by naveen.iyer· Mar 6, 2026Infrastructure

Question

How do OSPF and EIGRP compare?

Options

  • ABoth OSPF and EIGRP use the concept of areas.
  • BOSPF and EIGRP use the same administrative distance.
  • CEIGRP shows successor and feasible successor routes, and OSPF shows all known routes.
  • DEIGRP shows all known routes, and OSPF shows successor and feasible successor routes.

How the community answered

(44 responses)
  • A
    23% (10)
  • B
    11% (5)
  • C
    59% (26)
  • D
    7% (3)

Why each option

EIGRP uses successor and feasible successor routes for redundancy, while OSPF maintains a comprehensive topological database to calculate the best path.

ABoth OSPF and EIGRP use the concept of areas.

OSPF uses areas to segment the routing domain and improve scalability, but EIGRP does not inherently use the concept of areas in the same way; it uses autonomous systems and process IDs.

BOSPF and EIGRP use the same administrative distance.

OSPF and EIGRP do not use the same administrative distance; OSPF has an administrative distance of 110 (for internal routes), while EIGRP has an administrative distance of 90 for internal routes.

CEIGRP shows successor and feasible successor routes, and OSPF shows all known routes.Correct

EIGRP (Enhanced Interior Gateway Routing Protocol) uses Diffusing Update Algorithm (DUAL) to calculate primary (successor) and backup (feasible successor) routes, which are immediately available for failover. OSPF (Open Shortest Path First), as a link-state routing protocol, builds a complete topological database of its area and calculates the shortest path to all destinations, showing all known routes within that database and the resulting best path in the routing table.

DEIGRP shows all known routes, and OSPF shows successor and feasible successor routes.

This statement incorrectly swaps the characteristics; EIGRP uses successor/feasible successor, and OSPF shows all known routes in its topological database (LSDB).

Concept tested: OSPF vs EIGRP route calculation/storage

Source: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_eigrp/configuration/15-mt/ire-15-mt-book/ire-cfg-eigrp-over.html

Topics

#OSPF#EIGRP#routing protocol comparison#successor routes

Community Discussion

No community discussion yet for this question.

Sign up to join the discussion
Full 350-401 Practice