Layer 7

A network administrator wants to connect to a remote device via SSH.

Which of the following layers of the OSI model is the protocol using?

A.

3

B.

4

C.

5

D.

6

E.

7

E.

SSH (Secure Shell) is a network protocol used to securely connect and communicate with remote devices over an unsecured network. It provides a secure, encrypted connection that protects against eavesdropping, tampering, and other security threats.

To answer the question, we need to understand which layer of the OSI (Open Systems Interconnection) model SSH operates on. The OSI model is a conceptual framework that describes how network protocols and technologies work together to facilitate communication between different devices.

The OSI model has seven layers, each of which is responsible for a specific aspect of network communication:

1. Physical Layer: Deals with the physical aspects of data transmission, such as cables, connectors, and signaling.

2. Data Link Layer: Provides error-free transfer of data frames between devices over the physical layer.

3. Network Layer: Controls the routing of data packets between devices on different networks.

4. Transport Layer: Provides reliable, end-to-end delivery of data between applications on different devices.

5. Session Layer: Manages the communication sessions between applications on different devices.

6. Presentation Layer: Formats and presents data for application use.

7. Application Layer: Provides access to network services for applications.

SSH operates at the Application Layer (Layer 7) of the OSI model. It uses TCP/IP as the transport protocol, which operates at the Transport Layer (Layer 4). However, the protocol itself is designed to enable secure communication between remote devices at the Application Layer.

Therefore, the correct answer to the question is E) 7 - Application Layer.