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ISO/OSI Model

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ISO/OSI Model. Open Systems Interconnection ... OSI Layers. Organization of Model. Network Support Layers ... Exchange Using the OSI Model. Figure 3-4. Physical ... – PowerPoint PPT presentation

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Title: ISO/OSI Model


1
ISO/OSI Model
  • Open Systems Interconnection
  • Developed by the International Organization for
    Standardization (ISO)
  • Seven layers
  • A theoretical system delivered too late!
  • TCP/IP is the de facto standard

2
OSI Layers All People Seem To Need Data
ProcessingPlease Do Not Throw Sausage Pizza
Away.
  • Application
  • Presentation
  • Session
  • Transport
  • Network
  • Data Link
  • Physical

3
Communications Across Layers
  • Peer to peer processes
  • Each layer only sees its peer layer
  • Virtual communication between layers

4
Communication Between Layers
  • Envelopes
  • Each layer wraps the information passed to it in
    an appropriate header and trailer if required.
  • Headers are added to layers 2-6
  • Trailers added to layer 2

5
OSI Layers
Figure 3-2
6
Organization of Model
  • Network Support Layers
  • Deal with the physical aspects of moving data
    from one device to another
  • Layer 1 Bits
  • Layer 2 Packets and Addressing/Flow control
  • Layer 3 Logical Addressing/Routing

7
Organization of Model
  • Layer 4 Transport
  • Reliable delivery of messages
  • Service point addressing port address
  • Segmentation and re-assembly
  • Connection control
  • Flow Control
  • Error Control

8
Organization of Model
  • Layer 5 Session
  • Dialog Controller
  • Synchronization
  • Layer 6 - Presentation
  • Translation
  • Encryption
  • Compression

9
Organization of Model
  • Layer 7 Application
  • User Access to Network Services
  • X.400 Message handling email
  • X.500 Directory Services
  • FTAM

10
An Exchange Using the OSI Model
Figure 3-3
11
Figure 3-4
Physical Layer
12
Figure 3-5
Data Link Layer
13
Figure 3-6
Data Link Layer Example
14
Figure 3-7
Network Layer
15
Network Layer Example
Figure 3-8
16
Figure 3-8-continued
Network Layer Example
17
Transport Layer
Figure 3-9
18
Figure 3-10
Transport Layer Example
19
Figure 3-10-continued
Transport Layer Example
20
Figure 3-11
Session Layer
21
Figure 3-12
Presentation Layer
22
Figure 3-13
Application Layer
23
Figure 3-14
Summary of Layer Functions
? The McGraw-Hill Companies, Inc., 1998
WCB/McGraw-Hill
24
OSI v TCP/IP
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