S305_Lecture1_NetworkModel_Canvas

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16 Terms

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Local Area Network (LAN)
A network covering a small, clearly defined area, like a single floor or building.
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Backbone Network (BN)
High-speed networks that connect other networks together and can span hundreds of feet to several miles.
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Wide Area Network (WAN)
The largest type of network in geographic scope, often using leased circuits to connect multiple locations.
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Intranet
A network that uses Internet technologies to share information within an organization, accessible only to its members.
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Extranet
A network that shares information between organizations and is accessible only to invited users outside the organization.
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Internet Model
Also known as the TCP/IP model, this divides communication functions into layers, widely adopted for network models.
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Protocol Data Unit (PDU)
Contains layer-specific information needed for message transmission through a network, with each layer adding a PDU.
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Encapsulation
The process of placing a higher-level PDU inside a lower-level PDU for transmission.
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Open Systems Interconnection Reference Model (OSI model)
A conceptual model that standardizes the functions of a telecommunication or computing system into seven abstraction layers.
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Error checking
A function in data link layer protocols to ensure that messages are transmitted without errors.
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Protocol

It specifies the rules, functionality,
and messages for communication
at the layer

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Application Layer

User’s access to network, software to
perform work

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Transport layer

End to end management

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Network Layer

Deciding where the message goes

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Data link layer

Moving message from one device to next

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Physical Layer

Transmits the message