2.The
Seven OSI Model Layers"Please Do Not Throw Sausage
Pizza Away" - as told by Gordo
OSI Layer Function
*Application Layer Serves as a window for applications
to access net services. Handles general network access, flow control
and error recovery.
*Presentation Layer Layer is the network's translator. The
redirector operates here. Determines format for data. Responsible
for protocol conversion, translating and encrypting data, and
managing data compression.
*Session Layer Allows applications on two
PC's to connect and establish a session. Provides synchronization
between communicating computers.
*Transport Layer Responsible for packet handling. Ensures
error-free delivery. Repackages messages, divides messages into
smaller packets, and handles error handling.
*Network Layer Responsible for addressing,
determining routes for sending, managing network traffic problems,
packet switching, routing, data congestion, and reassembling data.
*Data Link Layer Sends data frames from network layer to
physical layer. Packages bits to frames.
*LLC- Manages link control and defines SAP's (Service Access
Points).
*MAC- Communicates with adapter card.
*Physical Layer Transmits data over a physical
medium. Defines cables, cards, physical aspects.
Additional notes:
*LLC - (Logical Link Control) Upper sublayer of DLL - manages DL
communication and defines the use of logical interface points -
defined by 802.2
*MAC - (Media Access Control) Lower sublayer of DLL - provides
shared access for the NIC Physical layer - is responsible for
delivering error-free data between 2 computers - defined by 802.3,
802.4, 802.5, and 802.12
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