draw a neat diagram of WAP architecture and explain in detail

I'm sorry, but as a text-based AI, I'm unable to draw diagrams. However, I can explain the WAP architecture in detail.

WAP (Wireless Application Protocol) architecture is a model that describes the various layers and components involved in delivering internet content to mobile devices. It's designed to scale across a variety of transport options.

WAP architecture consists of the following layers:

1. Wireless Application Environment (WAE): This is the topmost layer where the applications are executed. It includes Wireless Markup Language (WML), WMLScript, Wireless Telephony Application Interface (WTAI), and content formats.

2. Wireless Session Layer (WSL): This layer provides a consistent interface for network services. It manages the creation, suspension, resumption, and termination of sessions.

3. Wireless Transaction Layer (WTL): This layer provides a reliable request/response mechanism, similar to HTTP transactions.

4. Wireless Transport Layer Security (WTLS): This layer provides privacy, data integrity, and authentication for WAP services. It's equivalent to the TLS protocol in the web environment.

5. Wireless Datagram Protocol (WDP): This is the bottom layer that is equivalent to the UDP in the Internet model. It offers a consistent data format to the upper layers of the WAP protocol stack, regardless of the underlying network technology.

In a typical WAP scenario, a user with a WAP-enabled device (like a smartphone) sends a request to access a specific webpage. This request is sent to a WAP gateway/server, which retrieves the requested webpage from the internet, encodes it into a compact format (like WML), and sends it back to the user's device. The WAP browser on the user's device then decodes the message and displays the content.