The four layers of the TCP/IP protocol stack are listed below:
For each description in the table below, write the letter (W, X, Y or Z) that matches the description. Each letter must be used exactly once.
| Description | Letter |
|---|---|
| Attaches logical destination and source IP addresses, then determines the optimal routing path across multiple networks. | |
| Identifies the correct destination software process using port numbers, and manages error-checking or flow control. | |
| Translates user interactions into high-level network protocol commands, such as those used by DNS, FTP, or HTTPS. | |
| Encapsulates packets into frames, appending local physical (MAC) addresses, and converts them into electrical or optical signals. |