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What is the protocol number for OSPF in the IP header?
Correct Answer: D
Comprehensive and Detailed Explanation From Exact Extract: According toNokia 7750 SR OS OSPF Guide - OSPF Packet Transmission Section: "OSPF is encapsulated directly over IP using protocol number 89. It does not use TCP or UDP." TCP (Protocol 6) # Incorrect. UDP (Protocol 17) # Incorrect. OSPF operates directly at IP layer using protocol number 89. Thus, the correct answer isD.