ISO Model - Chabot College

advertisement
Chabot College
ELEC 99.05
Ch 2 - OSI Model
CISCO NETWORKING ACADEMY
What is Networking?
Networking - the interconnection of
workstations, peripherals, terminals
and other devices.
CISCO NETWORKING ACADEMY
Network Protocols
In today’s networks, it is possible for
different types of computers to
communicate.
Macs, PCs, and mainframes can all
share devices, data, and information,
as long as they all speak the same
language, or protocol.
CISCO NETWORKING ACADEMY
Network Protocols
Protocol - a set of rules, or an agreement,
that determines the format and
transmission of data.
CISCO NETWORKING ACADEMY
The Internet Protocol
All devices on the Internet “speak” the
same protocol: the Internet Protocol, or
IP.
The Internet actually uses a group, or
suite, of protocols called TCP/IP which
includes HTTP.
CISCO NETWORKING ACADEMY
The Internet Protocol
CISCO NETWORKING ACADEMY
Networking Growing Pains
Emerging network technologies were
built using different kinds of hardware
and software.
Many of the new network technologies
were incompatible.
CISCO NETWORKING ACADEMY
Toward Standardization
To address the problem, the International
Organization for Standardization (ISO)
researched leading networks schemes:
• Digital’s DECnet
• IBM’s SNA
• DoD’s TCP/IP (non-proprietary)
CISCO NETWORKING ACADEMY
The ISO’s Standard
The ISO recognized there was a need
to create a network model that would
help vendors create networks that
would work compatibly and
interoperably with other networks.
In 1984, the ISO released their
networking model.
CISCO NETWORKING ACADEMY
ISO’s OSI Reference Model
A Layered Model:
A mnemonic:
All People Seem To Need Data Processing
CISCO NETWORKING ACADEMY
ISO’s OSI Reference Model
A Layered Model:
Another mnemonic:
A Present Session Transports Network Data Physically
CISCO NETWORKING ACADEMY
ISO’s OSI Reference Model
Open System Interconnection (OSI)
CISCO NETWORKING ACADEMY
Layer Functions
CISCO NETWORKING ACADEMY
7 - Application Layer
CISCO NETWORKING ACADEMY
6 - Presentation Layer
CISCO NETWORKING ACADEMY
5 - Session Layer
CISCO NETWORKING ACADEMY
4 - Transport Layer
CISCO NETWORKING ACADEMY
3 - Network Layer
CISCO NETWORKING ACADEMY
2 - Data Link
CISCO NETWORKING ACADEMY
Data Link Sublayers
LLC (Logical Link Control)
MAC (Media Access Control)
IEEE 802 Extension to the OSI Model
CISCO NETWORKING ACADEMY
1 - Physical Layer
CISCO NETWORKING ACADEMY
Media Layers
CISCO NETWORKING ACADEMY
Host Layers
CISCO NETWORKING ACADEMY
Devices at Layers
CISCO NETWORKING ACADEMY
Moving Data
End
System
CISCO NETWORKING ACADEMY
End
System
Peer-to-Peer Communication
CISCO NETWORKING ACADEMY
Data Encapsulation
CISCO NETWORKING ACADEMY
Data Encapsulation Example
End
System
Intermediate
Systems
CISCO NETWORKING ACADEMY
TCP/IP’s Model
CISCO NETWORKING ACADEMY
TCP/IP
CISCO NETWORKING ACADEMY
TCP/IP v OSI Model
CISCO NETWORKING ACADEMY
What you will study…
CISCO NETWORKING ACADEMY
Download