§application: supporting network applications

•HTTP, IMAP, SMTP, DNS

§transport: process-process data transfer

•TCP, UDP

§network: routing of datagrams from source to destination

•IP, routing protocols

§link: data transfer between neighboring network elements

•Ethernet, 802.11 (WiFi), PPP

physical: bits “on the wire”

the name of an Internet layer with unit of data that is exchanged among protocol entities at that layer
name of an Internet layer unit of data
Application layer Message
Transport layer Segment
Network layer Datagram
Link layer Frame
Physical layer Bit