Which IGP routing protocol has traditionally been Cisco proprietary?

A) EIGRP
B) OSPF
C) RIP
D) IS-IS

A
Explanation: A) Of the major IGPs that have been traditionally implemented in the last several years, the only one that is Cisco proprietary is EIGRP; however, Cisco published EIGRP as an RFC around 2013, making it open for other vendors to implement.

Computer Science & Information Technology

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