How many protocol layers are listed under Protocol layers in the material?

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Multiple Choice

How many protocol layers are listed under Protocol layers in the material?

Explanation:
The material uses the TCP/IP four-layer model to organize the protocol stack. In this view, the layers are Application (where protocols like HTTP, DNS, and SMTP reside), Transport (TCP and UDP), Internet (IP), and Network Access (the link/physical layer). This four-layer framing is common in practical security and networking materials because it maps directly to real-world protocols and tasks, making it easier to reason about how data travels from an application down to the network interface. A three-layer view would drop an essential layer (for example, omitting either the transport or the network access functions), while five or six would reflect a different framing not used in this material.

The material uses the TCP/IP four-layer model to organize the protocol stack. In this view, the layers are Application (where protocols like HTTP, DNS, and SMTP reside), Transport (TCP and UDP), Internet (IP), and Network Access (the link/physical layer). This four-layer framing is common in practical security and networking materials because it maps directly to real-world protocols and tasks, making it easier to reason about how data travels from an application down to the network interface. A three-layer view would drop an essential layer (for example, omitting either the transport or the network access functions), while five or six would reflect a different framing not used in this material.

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