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Spaniard
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Concerned with the transmission and reception of the unstructured raw bit stream over the phsical medium
Physical Layer (1)
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Provides error-free transfer of data frames from one node to another over the Physical layer. Establishes & terminates the logical link between nodes. Error checking; media access control. Defines how data is formatted for transmission.
Data Link Layer (2)
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Provides connectivity and pathe selection between two host sustems. Controls the operations of the subnet, deciding which physical path the data takes. Routing, logical-physical address mapping.
Network Layer (3)
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Ensures that messages are delivered error-free, in sequence, and with no losses or duplications. Acknowledgement; traffic control, multiplexing. Breaking down large files into smaller segments.
Transport Layer (4)
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Establishes, manages, and terminates sessions between two communicatinf hosts. Allows session establishment between processes running on different stations.
Session Layer (5)
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Ensures that information sent from the application layer of one system is readable by the applicaion layer of another. Formats the data, conversion; compression; encryption; name recognition.
Presentation Layer (6)
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Serves as the window for users and application processes to access the network services. FTP
Application Layer (7)
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Data transmitted at this layer is called "Bits"
Physical Layer
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Data transmitted at this layer is called "Frames"
Data Link Layer
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Data transmitted at this layer is called "Packets"
Network Layer
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Data transmitted at this layer is called "Segments"
Transport Layer
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10.0.0.0 to 10.255.255.255
Class A Private
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172.16.0.0 to 172.31.255.255
Class B Private
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192.168.0.0 to 192.168.255.255
Class C Private
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224 - 239 (1110XXXX)
Class D prefix
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240 - 254 (1111XXXX)
Class E prefix
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Defines how data is sent through a network. Covers the same processes as the two lower OSI layers. (TCP/IP)
Link or Network Interface Layer
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Packages data and connects independent networks. Determines the best path through the network. (TCP/IP)
Internet Layer
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Provides communication session management between hosts. Represents the core of the TCP/IP architecture. (TCP/IP)
Transport Layer
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Defines TCP/IP application protocols and how host programs interface with transport layer services to use the network. (TCP/IP)
Application Layer
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