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30 Cards in this Set
- Front
- Back
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What is the source?
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Has an application to process a message to the transmitter/transceiver to send the message over the channel (medium).
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What is the destination?
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Has an equal application to process the message received from the receiver/transceiver.
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What is the OSI Model?
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Please Do Not Throw Sausage Pizza Away
----------------- Physical, Data Link, Network, Session, Presentation, Application |
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Where do you have Network Access?
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Physical, Data Link, and Network create network access.
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What are the last last four layers for?
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User end.
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What is the Physical Layer?
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Responsible for the transmission and receipt of the bit stream to and from nodes.
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What is the actual "physical" media layer?
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"Layer 0" (cable, fiber, etc...)
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What is the Data Link Layer?
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Responsible for taking the bit stream (from the physical layer) and providing point-to-point validity of the data.
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Which layers can other layers communicate with?
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Only adjacent layers.
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What else happens in the data link layer?
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There is checking and correction, CRC is most used approach. Data is converted to Frames.
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What is MAC?
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Ensures access to the shared medium. Media Access Control
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What does the MAC do?
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It's responsible for framing data prior to physical transmission. Transmits frames between end nodes.
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What is the network layer?
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It enables internetworking. Establishes routes between source and destination networks. (End-to-end with analysis at each hop)
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What does the network layer do?
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Converts data to packets, end to end in scope. Packets (reliable) andn datagrams (unreliable).
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What is the transport layer?
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Responsible for host-to-host integrity of transmission.
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What layer detects damaged or lost packets?
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Transport Layer, it generates retransmit requests (Sequence # and and ACK-acknowledgement)
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What does the transport layer do?
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Converts data to SEGMENTS, host to host in scope.
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What is the session layer?
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Establishes, maintains, and terminates host-to-host interactive sessions.
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What does the session layer do?
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It is the communication coordination. Used to uniquely identify a service, app, or function on a host via ports.
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What is the presentation layer?
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Responsible for managing the way data is presented.
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Presentation is the GUI (True or False)
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False: It's how the network stack sees the data.
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What does the presentation layer do?
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Code conversion/translation: ASCII, EBCDIC, Unicode.
Encryption & Text Compression. Data Syntax & Structure |
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What is the application layer?
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Provides the interface between user applications and network's services. (Not the actual application).
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What exists at the application layer?
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Application protocols, like HTTP, SIP, SSH, etc..
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What is the IPO model?
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Input - Processing - Output
Input: Bitstream, frame, packet Output: Encapsulated "Message" |
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What's the smallest single piece of data?
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Bits
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What is ASCII?
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American Standard Code for Information Interchange.
7 bit characters + 1 parity bit. |
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What is EBCDIC?
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Extended Binary Coded Decimal Interchange Code.
8 bit characters |
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What is ISO 10646?
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Unicode, 16 bit characters.
Backwards compatible with ASCII. |
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What is ASCII, EBCDIC, and ISO 10646?
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They are all data digitization.
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