Which of the following is NOT a characteristic of Open …

Which of the following is NOT a characteristic of Open Shortest Path First (OSPF)?

A.
Is a Cisco-proprietary routing protocol

B.
Has a default administrative distance of 110

C.
Supports authentication

D.
Uses cost as the default metric

Explanation:
OSPF is not a Cisco-proprietary routing protocol. It is an industry standard protocol supported by a wide range of vendors. The following are characteristics of
OSPF:
Uses Internet Protocol (IP) protocol 89.

Has a default administrative distance of 110.
Is an industry standard protocol (non Cisco-proprietary).
Supports Non-Broadcast Multi-Access (NBMA) networks such as frame relay, X.25, and Asynchronous Transfer Mode (ATM). The default hello interval for
NBMA networks is 30 seconds.
Supports point-to-point and point-to-multipoint connections.
Supports authentication.
Uses 224.0.0.6 as multicast address for ALLDRouters.
Uses 224.0.0.5 as multicast address for ALLSPFRouters.
Uses link-state updates and SPF calculation that provides fast convergence.
Recommended for large networks due to good scalability.
Uses cost as the default metric.
Objective:
Routing Fundamentals
Sub-Objective:
Compare and contrast interior and exterior routing protocols

Cisco > Articles > Cisco Certification > CCNP > Shooting Trouble with IP
Cisco > Internetworking Technology Handbook > Open Shortest Path First (OSPF)
CCNA ICND2 Official Exam Certification Guide (Cisco Press, ISBN 1-58720-181-X), Chapter 9: OSPF, pp. 347-361.