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What is osi model

How does the works 7th layers of OSI models

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The 7 Layers of the OSI Model
Last updated: March 03, 2008
The OSI, or Open System Interconnection, model defines a networking framework for implementing protocols in seven layers. Control is passed from one layer to the next, starting at the application layer in one station, proceeding to the bottom layer, over the channel to the next station and back up the hierarchy.
Application
(Layer 7)
This layer supports application and end-user processes. Communication partners are identified, quality of service is identified, user authentication and privacy are considered, and any constraints on data syntax are identified. Everything at this layer is application-specific. This layer provides application services for file transfers, e-mail, and other network software services. Telnet and FTP are applications that exist entirely in the application level. Tiered application architectures are part of this layer.
Presentation
(Layer 6)
This layer provides independence from differences in data representation (e.g., encryption) by translating from application to network format, and vice versa. The presentation layer works to transform data into the form that the application layer can accept. This layer formats and encrypts data to be sent across a network, providing freedom from compatibility problems. It is sometimes called the syntax layer.
Session
(Layer 5)
This layer establishes, manages and terminates connections between applications. The session layer sets up, coordinates, and terminates conversations, exchanges, and dialogues between the applications at each end. It deals with session and connection coordination.
Transport
(Layer 4)
This layer provides transparent transfer of data between end systems, or hosts, and is responsible for end-to-end error recovery and flow control. It ensures complete data transfer.
Network
(Layer 3)
This layer provides switching and routing technologies, creating logical paths, known as virtual circuits, for transmitting data from node to node. Routing and forwarding are functions of this layer, as well as addressing, internetworking, error handling, congestion control and packet sequencing.
Data Link
(Layer 2)
At this layer, data packets are encoded and decoded into bits. It furnishes transmission protocol knowledge and management and handles errors in the physical layer, flow control and frame synchronization. The data link layer is divided into two sub layers: The Media Access Control (MAC) layer and the Logical Link Control (LLC) layer. The MAC sub layer controls how a computer on the network gains access to the data and permission to transmit it. The LLC layer controls frame synchronization, flow control and error checking.
Physical
(Layer 1)
This layer conveys the bit stream - electrical impulse, light or radio signal -- through the network at the electrical and mechanical level. It provides the hardware means of sending and receiving data on a carrier, including defining cables, cards and physical aspects. Fast Ethernet, RS232, and ATM are protocols with physical layer components.



For further details go to:

http://en.wikipedia.org/wiki/OSI_model

Posted on Jan 13, 2009

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How do i access my osi restaurant company intranet portal online from my pc?


By osi, I think you mean iOS - an Apple. Use Teamviewer. You can find it at www.teamviewer.com.

May 19, 2014 | Computers & Internet

1 Answer

Network layer


What is the question here?
If you are asking about in the OSI model it is Layer 3.
http://en.wikipedia.org/wiki/Network_layer

Nov 04, 2013 | Quintum Computers & Internet

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Which device work in presentation layer in osi modul


i don't understand your problem clearly.
As far as i understand so this may be solution to your problem.
Solution:
"Gateway Re-director is operates on the presentation layer in OSI model"

Jan 04, 2011 | Computers & Internet

1 Answer

What is layer 2 ip?


layer 2 addresses are MAC addresses, which are hard coded in to networking devices, such as network cards. 'IP' addresses are classed as layer 3 addresses.

the 'layers' come from the OSI model

hope that helps :)

Oct 15, 2010 | Computers & Internet

1 Answer

Layer3


Which model are you talking about ? I have included both


Here is the OSI model
Layer 1 = physical medium & signal on the wire (physical)
Layer 2 = MAC Address and SNAP (ATM) (data link)
Layer 3 = IP Addressing V4 V6 (network)
Layer 4 = TCP/UDP (RTP, RTSP) (transport)
Layer 5 = Duplexing Half or full (Session)
Layer 6 = HTTP, FTP, SNMP (presentation)
Layer 7 = Web browser, FTP Client, (application)

TCP Model:
Layer 1 = physical medium & signal on the wire (physical) (Hub and reapeter)

Layer 2 = MAC Address and SNAP (ATM) (data) (Switches and bridges)

Layer 3 = IP Addressing V4 V6,
Layer 4 = TCP/UDP (RTP, RTSP) (Internetwork) (Firewall, IPSEC) Routers

(This function is split between 4&5) Duplexing Half or full

Layer 5 = , HTTP, FTP, SNMP, Web browser, FTP Client, (application) (programs)


I hope this helps,

Thank you,

Shuttle83

http://www.electron-age-technologies-llc.com

Feb 11, 2009 | IBM Nways 8277 Model 524 Networking Switch

1 Answer

Why we starting using OSI model


He probably needs an answer to the topic question for his studies.

ANSWER: The reason we started using it was to enable network communication between the various networking hardware products of various producers without it mattering which one was produced by who and on what platform. This is possible because the OSI model is a standardisation (ISO 7498-1) which lists the various functions provided by different network protocols into layers on top of each other in a way that the layers above each other can only use functions provided by a sub-layer and can only provide functions for a superior layer. The model clearly specifys how one layer can interact with the other. (this by the way is what we call RFC -- Request for Comments) This way a software of the layer written by one producer could cooperate/communicate with the software of a layer written by a different producer even on two different platforms.

Please rate if this solution helped you.

Feb 02, 2009 | Gateway Essential 400 PC Desktop

1 Answer

Layer3


http://en.wikipedia.org/wiki/OSI_model

Layer3 is the Network Layer of the OSI Model, IP operates at Network Layer, OSI Model comprises of 7 layers, Application, Presentation, Session, Transport, Network, Datalink, Physical layers.

It is a model to follow when you are building Operating systems, applications to be used on the internet or compatibility with others.

Hope this helps

Mutahir

PS : Read about it on the wiki link i have provided, let me know for any other questions you may have.

Sep 15, 2008 | Computers & Internet

1 Answer

Problem Accessing Network


Well Have You Studied The OSI Model Yet ?

Physical Connection is the first Layer , So I would say the physical connection.

when troubleshooting Network Problems don't complicate things from the start work from the bottom up

So Physical Connection is Step 1

Goodluck

Aug 20, 2008 | Computers & Internet

2 Answers

Difrence of lan wan


The Lan limit on unshielded twisted pair cable (UTP) is 300 ft for a local area network (lan). The cable uses the 802.3 Of course if fiber is used in a LAN then this # can be extended substantially.

Now the main difference between the LAN and Wide Area Network (WAN) is that LANs typically have 1 brodacast domain and froward packets at data link (layer 2 of the OSI) level using MAC addresses.

The WAN operates at the network level (layer 3 of the OSI). WANs are and reads IP addresses. Routers can extend far distances (as you said 40-60km) and band with depends on distance. the further away, the more attenuation on the line.

I hope this helps.

A wide area network

Jul 10, 2008 | Computers & Internet

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