SSCP · Question #1085
HTTP, FTP, SMTP reside at which layer of the OSI model?
The correct answer is D. Layer 7 - Application. HTTP, FTP, and SMTP are all considered application-layer protocols, operating at Layer 7 of the OSI model to provide direct services to end-user applications.
Question
HTTP, FTP, SMTP reside at which layer of the OSI model?
Options
- ALayer 1 - Physical
- BLayer 3 - Network
- CLayer 4 - Transport
- DLayer 7 - Application
- ELayer 2 - Data Link
How the community answered
(21 responses)- A5% (1)
- B5% (1)
- D90% (19)
Why each option
HTTP, FTP, and SMTP are all considered application-layer protocols, operating at Layer 7 of the OSI model to provide direct services to end-user applications.
Layer 1 (Physical) deals with the physical transmission of raw data bits, not application-level protocols.
Layer 3 (Network) is responsible for logical addressing and routing packets across networks (e.g., IP), which is below the application layer.
Layer 4 (Transport) handles end-to-end communication, segmentation, and reassembly of data (e.g., TCP, UDP), providing services to the application layer but not being the application protocols themselves.
HTTP (Hypertext Transfer Protocol), FTP (File Transfer Protocol), and SMTP (Simple Mail Transfer Protocol) function at Layer 7, the Application Layer, of the OSI model. This layer is responsible for providing network services directly to user applications, enabling specific functions like web browsing, file transfer, and email communication.
Layer 2 (Data Link) manages frame transmission within a local network segment and error detection, operating below the network and application layers.
Concept tested: OSI model Application Layer protocols
Source: https://learn.microsoft.com/en-us/windows-server/networking/osi-model-overview
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