GSEC Question #184: Real Exam Question with Answer & Explanation

The correct answer is A. Border Gateway Multicast Protocol (BGMP) B. Internet Security Association and Key Management Protocol (ISAKMP). BGMP and ISAKMP are classified at OSI Layer 5 (Session layer) because they manage session establishment and security association negotiation.

Question

Which of the following protocols work at the Session layer of the OSI model? Each correct answer represents a complete solution. Choose all that apply.

Options

ABorder Gateway Multicast Protocol (BGMP)
BInternet Security Association and Key Management Protocol (ISAKMP)
CTrivial File Transfer Protocol (TFTP)
DUser Datagram Protocol (UDP)

Explanation

BGMP and ISAKMP are classified at OSI Layer 5 (Session layer) because they manage session establishment and security association negotiation.

Common mistakes.

C. TFTP (Trivial File Transfer Protocol) is a file transfer protocol that operates at the Application layer (Layer 7) of the OSI model, not the Session layer.
D. UDP (User Datagram Protocol) is a connectionless transport protocol that operates at the Transport layer (Layer 4) of the OSI model, not the Session layer.

Concept tested. OSI Session layer protocol classification

Reference. https://www.rfc-editor.org/rfc/rfc2408

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