1.1
Compare and Contrast OSI TCP/IP models
OSI
|
Layer
Functional Description
|
TCP/IP
|
Application
|
Provides
an interface from the application to the network by supplying a protocol with
actions meaningful to the application (e.g. "get web page object"
|
|
Presentation
|
Negotiates
data formats, such as ASCII text, or image types like JPEG
|
|
Session
|
Provides
methods to group multiple bidirectional messages into a workflow for easier
management and easier backout of work that happened if the entire workflow
fails
|
Application
|
Transport
|
Focuses
on data delivery between two endpoint hosts (e.g. error recovery)
|
Transport
|
Network
|
Defines
logical addressing, routing, and routing protocols used to learn routes
|
Network
|
Data Link
|
Defines
the protocols for delivering data over a particular single type of physical
network (e.g. Ethernet protocols etc.)
|
Data Link
|
Physical
|
Defines
the physical characteristics of the transmission medium (e.g. pins,
electrical currents etc.)
|
Physical
|
-
Encapsulation terminology for OSI and TCP/IP model:
- Device and protocols examples:
- Same-layer, adjacent-layer interaction (e.g. TCP to HTTP, TCP to TCP etc.)
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