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16 Cards in this Set

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The process of transferring a message between sender and receiver is more easily implemented by breaking it down into simpler components.
OSI model
OSI stands for
Opens Systems Interconnection
How many layers are in the OSI modal?
7
an agreed-upon format for transmitting data between two devices.
protocol
What are the layers of the OSI model in order?
Application
Presentation
Session
Transport
Network
Data link
Physical
Provides a set of interfaces/utilities for user’s applications to access network services
application
formats data for presentation to the user,
May provide data formatting, compression, encryption, or translation between different data formats.
presentation
responsible for initiating, maintaining and terminating each logical session between sender and receiver.
session
deals with end-to-end issues
Flow control
segmenting the message for network transport, and
maintaining the logical connections between sender and receiver.
transport
responsible for
addressing networks (logical addressing),
moving data between networks, and
making routing decisions.
network
deals with
message delineation (forming a frame)
physical addressing (NIC address)
error control, and
network medium access control
data link
defines how individual bits are encoded into electronic signals to be transmitted through the network.
Hardware interfacing
Cabling standard
Signaling rate
physical
What are the two names of the communication standards?
De Jure (official):
De Facto
standards that emerge in the marketplace and are widely used, but lack official backing by a standards-making body
Example: EBCDIC (Extended Binary-Coded Decimal Interchange Code )
De facto
a standard developed by an industry or government standards-making body
Example: ASCII, Internet standards
De Jure
What are the 3 steps of the standardization processes?
Specification
Identification of choices
Acceptance