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Terms in this set (27)

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7-Application
..proviDes network services to applications
..OSI layer closest to the end user
..supports application and end-user processes
..There are many application network processes/protocols at this layer: HTTP, SMTP,FTP, etc.
..at this layer, sockets (host + port numbers) are used to differentiate applications/sessions
..Most application layer protocols use well port numbers: HTTP=80, SMTP=25, FTP=21
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6-Presentation
.. responsible to "CONFIGURE THE DATA"
.. e.g.: encription, compression, translation (ASCII/EBCDIC)
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5-Session
.. function = CONTROL the communication
..allow devices to establish and manage sessions (via a persistent logical linking btw 2 processes)
..is where connections/dialogs are established, managed, and torn down
e.g.: login rights, permissions, rights,
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4-Transport
..concerned with the transmission of the data
..guatantees end-to-end delivery data
..2 main protocols in this layer:
...Transmission Control Protocol (TCP) and
...User Datagram Protocol (UDP)
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3-Network
..function: define the shortest path to the destination network
..concerned with actually getting data from one computer to another (even if it is on a remote network)
..Logical Addressing (IP addresses - must be unique in the intire internetwork)
..main functions:
...routing: Moving data across a series of interconnected networks
...Datagram Encapsulation: add network layer header
...Fragmentation and Reassembly (to send to Data Link Layer)
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2-Data Link
..decide who talks in the network (via bus arbitration)
..basically defines the boundaries of what is considered a network
..the data link layer only deals with devices that are local to each other.
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1-Physical
..describes physical part of the network (things that we can touch/fill)
..e.g.: cables, frequencies, voltages, connectors, transfer rates, etc