Implementing and Operating Cisco Enterprise Network Core Technologies (ENCOR) — Question 455

What is one difference between EIGRP and OSPF?

Answer options

• A. EIGRP uses the DUAL distance vector algorithm, and OSPF uses the Dijkstra link-state algorithm.
• B. OSPF uses the DUAL distance vector algorithm, and EIGRP uses the Dijkstra link-state algorithm.
• C. EIGRP uses the variance command for unequal cost load balancing, and OSPF supports unequal cost balancing by default.
• D. OSPF is a Cisco proprietary protocol, and EIGRP is an IETF open standard protocol.

Correct answer: A

Explanation

The correct answer is A because EIGRP indeed uses the DUAL distance vector algorithm, which allows it to quickly converge, whereas OSPF uses the Dijkstra algorithm, a link-state method. The other options incorrectly attribute the algorithms and features to the wrong protocols or misrepresent their characteristics.