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200-150 · Question #121
200-150 Question #121: Real Exam Question with Answer & Explanation
The correct answer is G: Layer 7. HTTP is an application-layer protocol that operates at Layer 7 of the OSI model.
Question
At which layer in the OSI stack does the Hypertext Transfer Protocol operate?
Options
- ALayer 1
- BLayer 2
- CLayer 3
- DLayer 4
- ELayer 5
- FLayer 6
- GLayer 7
Explanation
HTTP is an application-layer protocol that operates at Layer 7 of the OSI model.
Common mistakes.
- A. Layer 1 is the Physical layer, concerned with electrical signals and physical media, not application protocols.
- B. Layer 2 is the Data Link layer, which handles MAC addressing and framing between directly connected nodes.
- C. Layer 3 is the Network layer, responsible for logical IP addressing and packet routing between networks.
- D. Layer 4 is the Transport layer, which provides end-to-end delivery via TCP or UDP - HTTP rides on top of TCP but is not itself a transport-layer protocol.
- E. Layer 5 is the Session layer, which manages session establishment and synchronization between communicating hosts.
- F. Layer 6 is the Presentation layer, responsible for data encoding, encryption, and format translation between systems.
Concept tested. HTTP placement in the OSI model
Reference. https://www.rfc-editor.org/rfc/rfc9110
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