D-Link DFL-1600 User Manual page 28

8
Transport Layer
– controls data flow and provides error-handling. Protocols: TCP,
UDP, etc.
Network Layer
– performs addressing and routing. Protocols: IP, OSPF, ICMP,
IGMP, etc.
Data-Link Layer
– frames the data. Protocols: Ethernet, PPP, etc.
Physical Layer
– defines hardware supports.
D-Link firewalls handle network traffics and perform diverse functions for
security guarantee and application support throughout the 7 layers of the
OSI model.
Application Layer
7
Presentation Layer
6
Session Layer
5
Transport Layer
4
Network Layer
3
Data-Link Layer
2
Physical Layer
1
Table 2.1: The OSI 7-Layer Model.
D-Link Firewalls User's Guide
Chapter 2. The OSI Model