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
Correct Answer: A
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.