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Translating a Letter Essay

An electrical signal, which runs through the copper wire found inside, covered with aluminum foil to prevent interference. One electric pulse will represent 1 and the absence 0.

A 01000001

The coaxial transmits an electrical signal, which runs through the copper wire found inside, covered with aluminum foil to prevent interference. One electric pulse will represent 1 and the absence 0.

The light produced by diode or laser, travels through the core due to the reflection occurring on the cover, light on will represent 1 and off 0.

These WIRELESS do not require wires to transmit signals, but use radio or infrared to send packets (data set) through the air.

OSI Model

Application Layer: Provides or serves as the window for the user of the OSI Model. -Provides communication between two application processes, such as application programs, network applications, etc. -Provides communications aspects for specific applications among networkers: network management, file transfer protocol (ftp), etc.

Presentation Layer: Translate the format and syntax assigned to data for transmission on the network.
-Determines the format of the data without regard for meaning or semantics.
-Set Independence to application processes considering the differences in data representation.
-Provides services to the application layer to interpret the meaning of the data exchanged.
-Operates exchange.
-Operates visualization.

Session Layer: provide the services used by the organization and synchronization of the dialogue between users and management and data exchange.

-Set the start and end of the session.
-Session recovery.
-Control of the dialogue; establishes the order in which messages should flow between end users.
-Reference devices by name rather than by address.
-Allows you to write programs that run on any network installation.

Transport Layer: This level acts as a bridge between the three communications fully oriented lower levels and three fully oriented higher level processing. It also ensures reliable delivery of information.

-Ensures that the arrival of data at the network level is the transmission characteristics and quality of service required by the Level 5 (Session).
-This level defines how to address the physical location of network devices.
-Assign a unique address to each user transport.
-Define a possible multi-channeling. That is, it can support multiple connections.
-Defines how to enable and disable the connections between nodes.
-Specify the protocol that guarantees message delivery.

-Sets data transparency and reliability of information transfer between two systems.
-Set the start and end of the session.
-Session recovery.
-Reference devices by name rather than by address.
-Allows you to write programs that run on any network installation.

Network Layer: This layer defines routing and forwarding packets between networks.

-This level is the responsibility of establishing, maintaining and terminating connections.
-This level provides message routing, determining whether a particular message to be sent to
-Level 4 (Transport Layer) or Level 2 (data link).
-This level switches, routes and congestion control information packets on a subnet.
-Defines the status of messages that are sent to nodes in the network.

Data Link Layer: This level provides facilities for transmitting blocks of data between two network stations. That is, organizes the 1’s and 0’s
Physical Layer formats or logical groups of information. To: -Detect errors at the physical level.

-Set error detection scheme for retransmissions or reconfigurations of the network. -Set the access method that the computer should continue to transmit and receive messages. The
-transfer of data via the physical link.
-Send data blocks needed for the sync control.

-Overall controls the level and the interfaces with the network layer, to communicate to the error-free transmission.

Physical Layer: Defines the medium used for the transfer of information, has control of this environment and control bits specified by:

-Define physical connections between computers.
-Describe the mechanical aspect of the physical interface.
-Describe the electrical aspect of the physical interface.
-Describe the functional aspect of the physical interface.
-Define Transmission Technique.
-Define the type of transmission.
-Set the Line Coding.
-Define Transmission Speed.
-Set the Operating Mode Data Line.

Transmitting Letter


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