OSI Model Flashcards
Layer 7
Application Layer
Application / user interface
(including user authentication etc.)
Layer 6
Presentation layer
Data translation /
presentation /
encryption
Layer 5
Session Layer
Session control,
allocation /
tracking
Layer 4
Transport Layer
Multiplexing / control,
Data delivery using flow control and
error recovery &
segmentation etc.
Layer 3
Network Layer
logical adressing and
path determination
(routing)
Layer 2
Data Link Layer
frame construction,
mac adressing,
error detection using frame check sequence
(switching)
Layer 1
Physical Layer
Electrical connections &
signals…
physical media
Layer 7
Protocol data unit (PDU)
Data
Layer 6
Protocol data unit (PDU)
Data
Layer 5
Protocol data unit (PDU)
Data
Layer 4
Protocol data unit (PDU)
TCP = Segmente
UDP = Datagram
Layer 3
Protocol data unit (PDU)
Packet
Layer 2
Protocol data unit (PDU)
Frame
Layer 1
Protocol data unit (PDU)
Bit
Layer 7
Protocol examples
HTTP, FTP, DNS,
SNMP, Telnet
Layer 6
Protocol examples
SSL, TLS
Layer 5
Protocol examples
NetBIOS, PPTP
Layer 4
Protocol examples
TCP, UDP
Layer 3
Protocol examples
IP, ARP, ICMP,
IPSec
Layer 2
Protocol examples
PPP, ATM, Ethernet
Layer 1
Protocol examples
Ethernet, USB, Bluetooth,
IEEE802.11(WLAN)
