350-401 Question #1207: Real Exam Question with Answer & Explanation

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.

Explanation

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

Common mistakes.

• A. 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.
• B. 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.
• D. 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

Reference. 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

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