| TCP/IP # | Layer Name | Encapsulation Unit | Protocol | Devices |
|---|---|---|---|---|
| 4 | Application | Data | FTP, HTTP, POP3, IMAP, telnet, SMTP, DNS, TFTP | All end devices like PC’s, Phones, Servers |
| 3 | Transport | Segments | TCP, UDP | Gateways, Firewalls |
| 2 | Internet | Packets | IP | Routers, Brouters, 3-layer switches |
| 1 | Network Access | Frames | ARP, RARP | Repeater, hub, transceiver, Bridges, 2-layer switches |
protocols, devices and unit of data
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