The four layers of the TCP/IP network protocol stack are listed below:
For each description in the table below, write the letter (A, B, C or D) that matches the description. Each letter must be used exactly once.
| Description | Letter |
|---|---|
| Adds source and destination IP addresses to packets and routes them across networks. | |
| Splits data into packets, secures reliable delivery, and manages port connections. | |
| Interacts directly with software applications, using protocols like HTTP and SMTP. | |
| Directs data transmission over the physical cable, optical fiber, or wireless medium. |