Transcript Another Model?!

Another Model?!
The TCP/IP Reference Model
By: Allan Johnson
A Bit of History
The TCP/IP Model was develop by the
Department of Defense in the late 60s’ to
ensure data communications would not be
interrupted even under the worse
circumstances.
Since then, TCP/IP has become the de facto
method we use for data communications on
the Internet.
The Four Layers of TCP/IP
Application
Includes all the functions
of the OSI’s Application,
Presentation, & Session
layers including:
• Data representation
• Data encryption and
• Dialog control
The Four Layers of TCP/IP
Application
Transport
Uses the TCP protocol
and is responsible for
quality of service issues
including:
• Reliability
• Flow Control and
• Error Correction
The Four Layers of TCP/IP
Application
Transport
Uses the IP protocol and
is responsible for:
Internet
• Path determination and
• Packet switching.
The Four Layers of TCP/IP
Application
Transport
Includes all the
functions of the OSI’s
Data Link & Physical
layers including:
Internet
• processes required by
IP to ensure a packet
reaches its destination.
Network Access
• all the various LAN &
WAN Technologies
such as 100BaseTX &
Frame Relay.
Protocols For Each Layer
Application
FTP-File Transfer
Protocol
HTTP-Hypertext
Transfer Protocol
SMTP-Simple Mail
Transfer Protocol
DNS-Domain Name
Service
TFTP-Trivial File
Transfer Protocol
Protocols For Each Layer
Application
Transport
TCP-Transmission
Control Protocol
UDP-User Datagram
Protocol
Protocols For Each Layer
Application
Transport
Internet
IP-Internet Protocol
Protocols For Each Layer
Application
Transport
Internet
Network Access
LAN & WAN
Technologies
TCP/IP
OSI
Application
Application
Presentation
Session
Transport
Transport
Internet
Network
Network Access
Data Link
Physical
Why Two Models!!
TCP/IP is the most popular “protocol
specific” model used on the Internet.
However, TCP/IP does not cover all the
protocols and standards we will be
exploring.
The OSI Model is “protocol independent.”
Therefore, all topics covered in the
curriculum can fit into its framework.
What To Know For The Test
The OSI Model’s layers & their key
characteristics and functions.
The process of data encapsulation and
the various PDUs.
The TCP/IP layers and its corresponding
protocols.
Comparison of the two model’s layers.
Good Luck!!