CCENT

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Author:
degraffm
ID:
92613
Filename:
CCENT
Updated:
2011-06-30 20:49:26
Tags:
networks
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Description:
Ch2 vocab
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  1. adjacent-layer interaction
    defines the concepts of how adjacent layers in a networking model, on the same computer, work together
  2. adjacent-layer interaction
    defines the concepts of how adjacent layers in a networking model, on the same computer, work together
  3. decapsulation
    the process in which the device interprets the lower-layer headers and,when finished with each header, removes the header, revealing the next-higher-layer PDU
  4. encapsulation
    The placement of data from a higher-layer protocol behind the header (and in some cases, between a header and trailer) of the next-lower-layer protocol. For example, an IP packet could be encapsulated in an Ethernet header and trailer before being sent over an Ethernet.
  5. Frame
    A term referring to a data-link header and trailer, plus the data encapsulated between the header and trailer.
  6. networking model
    A generic term referring to any set of protocols and standards collected into a comprehensive grouping that, when followed by the devices in a network, allows all the devices to communicate. Examples include TCP/IP and OSI
  7. packet
    A logical grouping of information that includes the network layer header and encapsulated data, but specifically does not include any headers and trailers below the network layer.
  8. protocol data unit (PDU)
    Protocol data unit. An OSI term to refer generically to a grouping of information by a particular layer of the OSI model. More specifically, an LxPDU would imply the data and headers as defined by Layer x.
  9. same-layer interaction
    The communication between two networking devices for the purposes of the functions defined at a particular layer of a networking model, with that communication happening by using a header defined by that layer of the model. The two devices set values in the header, send the header and encapsulated data, withthe receiving device(s) interpreting the header to decide what action to take
  10. segment
    In TCP, a term used to describe a TCP header and its encapsulated data (also called an L4PDU). Also in TCP, the process of accepting a large chunk of data from the application layer and breaking it into smaller pieces that fit into TCP segments. In Ethernet, a segment is either a single Ethernet cable or a single collision domain (no matter how many cables are used).
  11. Application
    (7) Interfaces between network and application software. Also includes authentication services.
  12. Presentation
    (6) Defines the format and organization of data. Includes encryption.
  13. Session
    (5) Establishes and maintains end-to-end bidirectional flows between endpoints. Includes managing transaction flows.
  14. Transport
    (4) Provides a variety of services between two host computers, including connection establishment and termination, flow control, error recovery, and segmentation of large data blocks into smaller parts for transmission.
  15. Network
    (3) Logical addressing, routing, and path determination.
  16. Data link
    (2) Formats data into frames appropriate for transmission onto some physical medium. Defines rules for when the medium can be used. Defines means by which to recognize transmission errors.
  17. Physical
    (1) Defines the electrical, optical, cabling, connectors, and procedural details required for transmitting bits, represented as some form of energy passing over a physical medium.

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