19-06-2012, 02:06 PM
COMPARISON OF OSI AND TCP
SIMILARITIES
The main similarities between the two models include the following:
They share similar architecture. - Both of the models share a similar architecture. This can be illustrated by the fact that both of them are constructed with layers.
They share a common application layer.- Both of the models share a common "application layer". However in practice this layer includes different services depending upon each model.
Both models have comparable transport and network layers.- This can be illustrated by the fact that whatever functions are performed between the presentation and network layer of the OSI model similar functions are performed at the Transport layer of the TCP/IP model.
Knowledge of both models is required by networking professionals.- According to article obtained from the internet networking professionals "need to know both models". (Source:
Both models assume that packets are switched.- Basically this means that individual packets may take differing paths in order to reach the same destination.
DIFFERENCES
The main differences between the two models are as follows:
TCP/IP Protocols are considered to be standards around which the internet has developed. The OSI model however is a "generic, protocol- independent standard." (www.netfactcrs)
TCP/IP combines the presentation and session layer issues into its application layer.
TCP/IP combines the OSI data link and physical layers into the network access layer.
TCP/IP appears to be a more simpler model and this is mainly due to the fact that it has fewer layers.
TCP/IP is considered to be a more credible model- This is mainly due to the fact because TCP/IP protocols are the standards around which the internet was developed therefore it mainly gains creditability due to this reason. Where as in contrast networks are not usually built around the OSI model as it is merely used as a guidance tool.
The OSI model consists of 7 architectural layers whereas the TCP/IP only has 4 layers.
Related Terms
• OSI »
• The OSI Reference Model - Understanding Layers »
• application (application software)(Sponsored) »
• Logical Link Control layer »
• Understanding The Data Link Layer »
• routing switch »
• dual layer »
• layer »
• Modbus protocol »
• X.400 »
• modeling »
• switch »
• PDU »
• EV SSL »
Posted: 09-24-2010 , Last Updated: 10-08-2010
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.
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, and proceeding to the bottom layer, over the channel to the next station and back up the hierarchy.
Application (Layer 7)
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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 framesynchronization, flow control and error checking.
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.
Improve
Sychronous Transmission does not start & stop bits for sending data segments while Asychronous transmission uses start & stop bits which are added at the start & end of data segments.
Sychronous transmission provides 64 or 128 Kbps speed but
asychronous transmission provides 38.4 Kbps speed.
Note: There are comments associated with this question. See the discussion page to add to the conversation.
SIMILARITIES
The main similarities between the two models include the following:
They share similar architecture. - Both of the models share a similar architecture. This can be illustrated by the fact that both of them are constructed with layers.
They share a common application layer.- Both of the models share a common "application layer". However in practice this layer includes different services depending upon each model.
Both models have comparable transport and network layers.- This can be illustrated by the fact that whatever functions are performed between the presentation and network layer of the OSI model similar functions are performed at the Transport layer of the TCP/IP model.
Knowledge of both models is required by networking professionals.- According to article obtained from the internet networking professionals "need to know both models". (Source:
Both models assume that packets are switched.- Basically this means that individual packets may take differing paths in order to reach the same destination.
DIFFERENCES
The main differences between the two models are as follows:
TCP/IP Protocols are considered to be standards around which the internet has developed. The OSI model however is a "generic, protocol- independent standard." (www.netfactcrs)
TCP/IP combines the presentation and session layer issues into its application layer.
TCP/IP combines the OSI data link and physical layers into the network access layer.
TCP/IP appears to be a more simpler model and this is mainly due to the fact that it has fewer layers.
TCP/IP is considered to be a more credible model- This is mainly due to the fact because TCP/IP protocols are the standards around which the internet was developed therefore it mainly gains creditability due to this reason. Where as in contrast networks are not usually built around the OSI model as it is merely used as a guidance tool.
The OSI model consists of 7 architectural layers whereas the TCP/IP only has 4 layers.
Related Terms
• OSI »
• The OSI Reference Model - Understanding Layers »
• application (application software)(Sponsored) »
• Logical Link Control layer »
• Understanding The Data Link Layer »
• routing switch »
• dual layer »
• layer »
• Modbus protocol »
• X.400 »
• modeling »
• switch »
• PDU »
• EV SSL »
Posted: 09-24-2010 , Last Updated: 10-08-2010
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.
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, and proceeding to the bottom layer, over the channel to the next station and back up the hierarchy.
Application (Layer 7)
Sponsored
Take an interactive tour:: The IBM SmartCloud gives your business the IT resources it needs.
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 framesynchronization, flow control and error checking.
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.
Improve
Sychronous Transmission does not start & stop bits for sending data segments while Asychronous transmission uses start & stop bits which are added at the start & end of data segments.
Sychronous transmission provides 64 or 128 Kbps speed but
asychronous transmission provides 38.4 Kbps speed.
Note: There are comments associated with this question. See the discussion page to add to the conversation.