Question: 2. Provide the underlying transport layer protocol and the port number for HTTP, SMTP, and DNS, using the following table. Application layer protocol Underlying transport
2. Provide the underlying transport layer protocol and the port number for HTTP, SMTP, and DNS, using the following table.
| Application layer protocol | Underlying transport layer protocol | The port number of the listening server |
| HTTP |
|
|
| SMTP |
|
|
| DNS |
|
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