What is that OSI Model
the Open Systems Interconnection model (OSI model) is a way of sub-dividing a communications system into smaller parts called layers
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Quelle: http://en.wikipedia.org/wiki/OSI_model
Quelle: http://en.wikipedia.org/wiki/OSI_model
What is Layer 4?
Layer 4 = Transport
End-to-end connections and reliability, Flow Control
End-to-end connections and reliability, Flow Control
What is Layer 6?
Layer 6 = Presentation
Data representation, encryption and decryption, convert machine dependent data to machine independent data
Data representation, encryption and decryption, convert machine dependent data to machine independent data
What Layer are in the Media Layers
Layer 1 = Physical
Layer 2 = Data Link
Layer 3 = Network
Layer 2 = Data Link
Layer 3 = Network
What Layers are part of the Host Layers
Layer 4 = Transport
Layer 5 = Session
Layer 6 = Presentation
Layer 7 = Application
Layer 5 = Session
Layer 6 = Presentation
Layer 7 = Application
What does Layer 1 (The Physical layer) do?
It defines the relationship between a device and a Transmission (Optical, Copper Cable)
What does Layer 2 (The Data Link layer) do?
- provides the functional and procedural means to transfer data
between network entities and to detect and possibly correct
errors that may occur in the Physical Layer
- Assignees an address to devices.
- procedural means to transfer data between network entities
(At least least two or more devices).
- Local area network architecture, which included
broadcast-capable multiaccess media
- It only has error detection, not flow control.
between network entities and to detect and possibly correct
errors that may occur in the Physical Layer
- Assignees an address to devices.
- procedural means to transfer data between network entities
(At least least two or more devices).
- Local area network architecture, which included
broadcast-capable multiaccess media
- It only has error detection, not flow control.
What does Layer 3 (The Network layer) do?
- provides the functional and procedural means of transferring
variable length data sequences from a source to a destination
via one or more networks
- It has 3 sub-layers
o1.Subnetwork Access,
o2.Subnetwork Dependent Convergence
o3.Subnetwork Independent Convergence
variable length data sequences from a source to a destination
via one or more networks
- It has 3 sub-layers
o1.Subnetwork Access,
o2.Subnetwork Dependent Convergence
o3.Subnetwork Independent Convergence
What does Layer 4 (The Transport layer) do?
- provides transparent transfer of data between end users,
providing reliable data transfer services to the upper layers
- controls the reliability of a given link through flow control,
segmentation/desegmentation, and error control
providing reliable data transfer services to the upper layers
- controls the reliability of a given link through flow control,
segmentation/desegmentation, and error control
What does Layer 5 (The Session layer) do?
- controls the dialogues (connections) between computers
- It establishes, manages and terminates the connections
between the local and remote application.
- provides for full-duplex, half-duplex, or simplex operation
- It establishes, manages and terminates the connections
between the local and remote application.
- provides for full-duplex, half-duplex, or simplex operation
What does Layer 6 (The Presentation layer) do?
- establishes context between Application Layer entities
- provides independence from data representation (e.g.,
encryption) by translating between application and network
formats
- provides independence from data representation (e.g.,
encryption) by translating between application and network
formats
What does Layer 7 (The Application layer) do?
- The OSI layer closest to the end user, which means that both the
OSI application layer and the user interact directly with the
software/application
- Its functions typically include identifying communication partners,
determining resource availability, and synchronizing
communication
OSI application layer and the user interact directly with the
software/application
- Its functions typically include identifying communication partners,
determining resource availability, and synchronizing
communication
Kartensatzinfo:
Autor: CoboCards-User
Oberthema: IT
Thema: OSI Modle
Veröffentlicht: 27.10.2010
Tags: IT Networking
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