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Which of the following protocols operates at the session layer (layer 5)?
Correct Answer: A
Section: Network and Telecommunications Explanation/Reference: Remotre Procedure Call (RPC) is the only of the above choices to operate at the session layer (layer 5). All of the other answers were wrong. LPD operates at layer 7 SPX operates at layer 4 IGMP operates at layer 3. Reference: WALLHOFF, John, CBK#2 Telecommunications and Network Security (CISSP Study Guide), April 2002 (page 1).