Lecture2
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Lecture 2 OSI Reference Model and TCP/P reference Model
Reference Models • • •
The OSI Reference Model The TCP/IP Reference Model A Comparison of OSI and TCP/IP
The OSI Reference Model 7 Application 6 Presentation 5 Session
The OSI Model will be used throughout your entire networking career!
4 Transport 3 Network 2 Data Link 1 Physical
Memorize it!
Reference Models
The OSI reference model.
The OSI Reference Model Encapsulation of Data data 7
application
6
presentation
5
session
4 3
transport
2 1
data link
network physical
H: header T: trailer
AH data PH
AH data
SH
PH
AH data
TH SH
PH
AH data
NH TH SH
PH
AH data
DH NH TH SH
PH
bit streams
AH data DT
Source Computer
Destination Computer
OSI Layers
•Connectors, jacks, cables etc
OSI Layers
•Provides connectivity and path selection between two host •Provides Logical address •No error correction, best effort delivery. •Flow Control
OSI Layers
Routing Congestion control Path selection etc
OSI Layers
•Sequencing of packets
OSI Layers
OSI Layers
• Encryption and Decryption •Compression and Decompression
OSI Layers
•http •DNS •SNMP •ftp
Peer-to-Peer Communication
The TCP/IP Model
Comparison with OSI Layer
The TCP/IP reference model.
TCP/IP Applications
Transport Layer Protocols
Internet Layer Protocols
Network Access Protocols
Reference Models (3)
Protocols and networks in the TCP/IP model initially.
A Critique of the TCP/IP Reference Model Problems: • Service, interface, and protocol not distinguished • Not a general model • Host-to-network “layer” not really a layer • No mention of physical and data link layers
Hybrid Model
The hybrid reference model to be used in this book.
Example Networks •
The Internet
•
Connection-Oriented Networks: X.25, Frame Relay, and ATM
•
Ethernet
•
Wireless LANs: 802:11
Architecture of the Internet
Overview of the Internet.
What is Bandwidth
Network Standardization • • •
Who’s Who in the Telecommunications World Who’s Who in the International Standards World Who’s Who in the Internet Standards World
IANA assigns IP addresses to ISPs or LANs
IEEE 802 Standards
The 802 working groups. The important ones are marked with *. The ones marked with are hibernating. The one marked with † gave up.
Reference Models • • •
The OSI Reference Model The TCP/IP Reference Model A Comparison of OSI and TCP/IP
The OSI Reference Model 7 Application 6 Presentation 5 Session
The OSI Model will be used throughout your entire networking career!
4 Transport 3 Network 2 Data Link 1 Physical
Memorize it!
Reference Models
The OSI reference model.
The OSI Reference Model Encapsulation of Data data 7
application
6
presentation
5
session
4 3
transport
2 1
data link
network physical
H: header T: trailer
AH data PH
AH data
SH
PH
AH data
TH SH
PH
AH data
NH TH SH
PH
AH data
DH NH TH SH
PH
bit streams
AH data DT
Source Computer
Destination Computer
OSI Layers
•Connectors, jacks, cables etc
OSI Layers
•Provides connectivity and path selection between two host •Provides Logical address •No error correction, best effort delivery. •Flow Control
OSI Layers
Routing Congestion control Path selection etc
OSI Layers
•Sequencing of packets
OSI Layers
OSI Layers
• Encryption and Decryption •Compression and Decompression
OSI Layers
•http •DNS •SNMP •ftp
Peer-to-Peer Communication
The TCP/IP Model
Comparison with OSI Layer
The TCP/IP reference model.
TCP/IP Applications
Transport Layer Protocols
Internet Layer Protocols
Network Access Protocols
Reference Models (3)
Protocols and networks in the TCP/IP model initially.
A Critique of the TCP/IP Reference Model Problems: • Service, interface, and protocol not distinguished • Not a general model • Host-to-network “layer” not really a layer • No mention of physical and data link layers
Hybrid Model
The hybrid reference model to be used in this book.
Example Networks •
The Internet
•
Connection-Oriented Networks: X.25, Frame Relay, and ATM
•
Ethernet
•
Wireless LANs: 802:11
Architecture of the Internet
Overview of the Internet.
What is Bandwidth
Network Standardization • • •
Who’s Who in the Telecommunications World Who’s Who in the International Standards World Who’s Who in the Internet Standards World
IANA assigns IP addresses to ISPs or LANs
IEEE 802 Standards
The 802 working groups. The important ones are marked with *. The ones marked with are hibernating. The one marked with † gave up.
