OSI 7 layers.

7- Application: the layer we see; http, dns, ftp
6- Presentation: encoding and encryption
5- sesion: communication between devices (tunneling protocols)
4- Transport: Flow COntrol/Error Recovery/Connection Establishment/Virtual Circuits/Resembles data into a data stream
3- Network: routing layer (IP Addressing)
2- Data Link: Switch/Mac Addresses/Divided into 2 sublayers LLC and MAC
1- Physical: Cables, Connectors


TCP 4 layers

4- APplication (Session, presentation, and application combo
3- Transport(just transport)
2- Internet (just network)
1- Link layer (data link & physical combined)

Application Layer - DNS, DHCP, FTP, HTTPS, IMAP, LDAP, NTP, POP3, RTP, RTSP, SSH, SIP, SMTP, SNMP, TELNET< TFTP
Presentation Layer: JPEG, MIDI, MPEG, PICT, TIFF
Session Layer: NetBIOS, NFS< PAP, SCP, SQL, ZIP