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OSI Networking Model

 

The OSI Networking Model is used as a reference point to describe how the various "layers" of networking interoperate.
It is also called the OSI seven layer model.

 

Here is a summary of the model with Layers, Topics and Methods with a short description for each method.

 

Presented  by Abbe Vallipour, ASL Consulting

 

1- Physical layer
2- Data Link layer
3- Network layer
4- Transport layer
5- Session layer
6- Presentation layer
7- Application layer

 

A summary table starting with the bottom layer (1)

 

OSI Layer Topics Methods
1-Physical Connection types Point-to-Point
-Bits & Packets.   Multipoint
  Physical topology Bus
.Concentrators   Ring
.Hubs   Star
.Repeaters   Mesh
.Connectors   Cellular
.Modems Digital signaling Current state
.Codecs   State transition
  Analog signaling Current state
    State transition
  Bit synchronization Asynchronous
    Synchronous
  Bandwidth use Broadband (thick ethernet)
*Implementations of Physical layer   Baseband  (thin ethernet)
protocols are transmission media- Multiplexing Frequency-Division (FDM)
specific.   Time-Division (TDM)
    Stat.Time-Division (StatTDM)
 
 
 

OSI Layer

Topics

Methods

2-Data Link-MAC

Logical Topology

Bus

(Media Access Control)

 

Ring

-Frames & Packets.

Media access

Contention   (802.2 & 802.3)

.Bridges

 

Token passing   (802.4 & 802.5)

.Intelligent hubs

 

Polling

.NICs

Addressing

Physical device

2-Data Link-LLC

Transmission

Asynchronous

(Logical Link Control)

Synchronization

Synchronous

*Organize first layer's bits to frames,

 

Isochronous

 & identify computers on the network.

Connection services

LLC-level flow control

>Operates on a single network.

 

Error control

 
 
 

OSI Layer

Topics

Methods

3-Network

Addressing

Logical network

-Datagrams & Packets.

 

Service

 

Switching

Circuit

.Routers

 

Message

 

 

Packet

 

Route discovery

Distance vector   (RIP, RIP II)

 

 

Link-state   (OSPF, NLSP)

*Move data to specific network

Route selection

Static

locations. Ensure correct data routes

 

Dynamic

through an internetwork of decimilar

Connection services

Network-layer flow control

networks

 

Error control

 

 

Packet sequence control

>Operates on multiple (inter)networks.

Gateway services

Network-layer translation

 
 
 

OSI Layer

Topics

Methods

4-Transport

Address/name resolution

Service-requestor-initiated

-Segments & Packets.

 

Service-provider-initiated

 

Addressing

Connection identifier

*Organizes higher level messages

 

Transaction identifier

into segments & delivers to session,

Segment development

Division and combination

or higher, layer processes.

Connection services

Segment sequencing

>two connections (conversations)

 

Error control

on end-nods

 

End-to-end flow control

 
 
 

OSI Layer

Topics

Methods

5-Session

Dialog control

Simplex

-Packets

 

Full-duplex

 

 

Half-duplex

 *Facilitates communications

Session administration

Connection establishment

 (& places the "calls") between

 

Data transfer

service requestors & providers

 

Connection release
 
 
 

OSI Layer

Topics

Methods

6-Presentation

Translation    

Bit order

-Packets

 

Byte order

*Transforms data into a mutually

 

Character code

agreed-upon format (syntax)

 

File syntax

understood by app.& computer.

Encryption

Public key

 also encrypt or decrypt data

Transpos. Subst. Algebraic

Private key

 
 
 

OSI Layer

Topics

Methods

 7-Application

Network services

 

-Messages & Packets

Service advertisement

Active

 

 

Passive

*Provides the protocols necessary to

Service use

OS call interception

perform the specific network service

 

Remote operation

function for other 6 layer's services.

 

Collaborative

 

 

 

 

> Download the complete OSI model cheat sheet document in MS Excel format

 

> Here is an excelent on-line reading for those interested in the subject.

 
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