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7
Computer Networking
Professional
07/19/2013

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Term
Physical Layer 1
Definition
Conveys the bit-stream. / Electrical, light, or radio signal through the network at the electrical and mechanical level. Also called "media". EIA/TIA-232, V.35.
Term
Session Layer 5
Definition
Establishes, manages, and terminates connections between applications. / Responsible for coordinating communications between systems/nodes. NFS, SQL, ASP, SCP.
Term
Application Layer 1
Definition
Supports application and end-user processes. / Provides application services for file transfers, email, and other network software services.
Term
Presentation Layer 6
Definition
Translates from application, to network formats, and vice-versa. / Formats and encrypts/decrypts data to be sent across a network. Responsible for presenting the data in standard formats. jpeg, mpeg, midi, tiff, qt.
Term
Network Layer 3
Definition
Creates logical paths for transmitting data from node to node. / Includes switching, routing , and forwarding.
Term
Data Link Layer 2
Definition
Packets are encoded and decoded into bits. / Two sub-layers: Media Access Control (MAC), Logical Link Control (LLC). LLC handles error control, flow control, framing, etc. MAC handles access to shared media such as Ethernet.
Term
Transport Layer 4
Definition
Responsible for end-to-end error recovery, flow control (windowing), and multiplexing (segmenting). / Ensures complete data transfer.
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