Which protocols are classified as Interior Gateway Protocols (IGP)? 05/20/2017 – by Mod_GuideK 0 Which protocols are classified as Interior Gateway Protocols (IGP)? A. RIP B. BGP C. MPLS D. OSPF E. IGMP SHOW ANSWERSCorrect Answer: AD Explanation/Reference: Download Printable PDF. VALID exam to help you PASS.