What is one difference between EIGRP and OSPF?

Question

Options

• AOSPF is a Cisco proprietary protocol, and EIGRP is an IETF open standard protocol.
• BOSPF uses the DUAL distance vector algorithm, and EIGRP uses the Dijkstra link-state algorithm
• CEIGRP uses the variance command lot unequal cost load balancing, and OSPF supports unequal
• DEIGRP uses the DUAL distance vector algorithm, and OSPF uses the Dijkstra link-state algorithm

• A
  2% (1)
• B
  2% (1)
• D
  95% (39)

Explanation

EIGRP vs OSPF: Key Differences

Why D is Correct: EIGRP (Enhanced Interior Gateway Routing Protocol) uses the DUAL (Diffusing Update Algorithm), which is a distance vector/hybrid algorithm, while OSPF (Open Shortest Path First) uses the Dijkstra (SPF) algorithm, which is a link-state algorithm. This is a foundational architectural difference between the two protocols.

Why the Distractors are Wrong:

• A is wrong because it has the descriptions completely backwards - EIGRP was originally Cisco proprietary (though later submitted to IETF), and OSPF is the IETF open standard
• B is wrong because it also reverses the algorithms - it incorrectly assigns DUAL to OSPF and Dijkstra to EIGRP
• C is misleading because while EIGRP does support unequal-cost load balancing via the variance command, OSPF only supports equal-cost load balancing, making the second half of option C incorrect

Memory Tip: Use the acronym associations: EIGRP → DUAL (both have strong consonants, think "ED") and OSPF → Dijkstra (think "Open Shortest Path First" naturally implies running Dijkstra's shortest path algorithm).

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