Which OSI layer is identified as Layer 7 in the model?

• A. Network Layer
• B. Data Link Layer
• C. Application Layer
• D. Physical Layer

Answer: (C)

The main idea is recognizing which OSI layer sits at the top and provides network services directly to applications. The topmost layer, Layer 7, is the Application layer. Its job is to offer interfaces and services that allow end-user software to access network resources, with protocols such as HTTP for the web, FTP for file transfer, and SMTP for email. This layer focuses on how applications use the network, not on how data is actually transported or routed. Beneath it are the layers that handle transport semantics (reliable or best-effort delivery), routing and addressing, framing and error detection on a link, and the physical signaling. Because it directly serves applications and enables their network interactions, Layer 7 is the Application layer.