OSI model

TCP/IP Model	OSI Model	Data Unit	Devices	Protocols	Operations
Application	Application	Data		SMTP, HTTP, FTP, POP3, SNMP, Telnet
"	Presentation	"		SSL, TLS	Translate, encrypt and compress dat
"	Session	"	Gateway	Sockets(TCP, RTP)	Establish, manage, and terminate the session
Transport	Transport	Segment, Datagram	Firewall	TCP, UDP
Network	Network	Packet	Router	IPV4, IPV6, ICMP, IPSEC, ARP, MPLS	Move packets from source to destination
Datalink	Datalink	Frame	Switch, Bridge	PPP, Frame Relay, ATM, IEEE 802.3, NDP, LLDP, STP, VLAN	Organize bits into frames. To provide hop-to-hop delivery
Physical	Physical	Bit	Hub, Repeater, Modem, Cable	RS232, 100BaseTX, ISDN, RJ45, Token Rings	Transmit bits over a medium