Net-centric ch 2

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cbai
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100310
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Net-centric ch 2
Updated:
2011-09-07 16:39:35
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CIS Net centric
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Chapter 2 terms
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  1. concerns the format of the data blocks
    Syntax
  2. Includes control information for coordination and error handling
    Semantics
  3. Includes speed matching and sequencing


    • Timing
  4. is concerned with the exchange of data between a computer and the network to which
    it is attached.
    Network access layer
  5. collect mechanisms in a common layer shared by all applications.
    Transport layer
  6. contains the logic needed to support the various user applications.
    Application layer
  7. connoting the fact that each application is individually accessing he services of the
    transport layer. (Different application addresses within a single computer)
    Service access points (SAP) or ports
  8. this indicates the application that sent the data.
    Source port
  9. When the destination transport layer receives the segment, it must know to which
    application the data are to be delivered.
    Destination port
  10. The combination of data from the next higher layer and control information.
    Protocol data unit (PDU)
  11. The addition of control information to data.
    Encapsulation
  12. The transport protocol is sending a sequence of segments, it numbers them sequentially so that if they arrive out of order the destination
    transport entity may reorder them.
    Sequence number
  13. a code that is a function of the contents of the segment that checks against the
    receiving transport calculation and compares the result for discrepancy.
    Error-detection code, Checksum, or Frame checks sequence
  14. is concerned with specifying the characteristics of the transmission medium the nature of the signals, the data rate, and related
    matters. (twisted pair, optical fiber, satellite, terrestrial microwave)

    Physical layer
  15. Application layer
    • contains the logic needed to support the various user applications. Provides access to
    • the TCP/IP environment for users and also provides distributed information
    • services.
  16. a code that is a function of the contents of the segment that checks against the receiving transport calculation and compares
    the result for discrepancy.
    Checksum
  17. Can adjust to wide changes in delay and/or throughput. Traditional type of traffic
    for which internets were designed
    Elastic traffic
  18. Is used to send files from one system to another under user command. Both text and
    binary files are accommodated, and the protocol provides features for
    controlling user’s access.
    File Transfer Protocol (FTP)
  19. The sending TCP includes a code that is a function of the contents of the segment.
    The receiving TCP preforms the same calculations and compares the result with
    the incoming code. A discrepancy results if there has been some error in
    transmission.
    Frame check sequence
  20. after a block is broken in smaller pieces a leader is appended to it containing
    protocol control information.
    Header
  21. Does not easily adapt to variations changes in delay and/or throughput. e.g. real
    time traffic
    Inelastic traffic
  22. evolved from the ARPANET, which was developed in 1969 by the advance research projects
    agency (ARPA) of the U.S. Department of defense
    Internet
  23. is the principal communications protocol used for relaying datagrams (packets)
    across an internetwork using the Internet Protocol Suite. Responsible for
    routing packets across network boundaries, it is the primary protocol that
    establishes the Internet.
    Internet Protocol (IP)
  24. IP appends a header of control information to each segment
    IP datagram
  25. Human-Computer integration involving text,
    graphics, voice and video. Multimedia also refers to storage devices that are
    used to store multimedia content.
    Multimedia
  26. is concerned with the exchange of data between a computer and the network to which
    it is attached.
    Network layer
  27. is a standardized architecture that is often used to describes communications
    functions but that is now rarely implemented
    Open Systems Interconnection (OSI)
  28. the network access protocol (NAP) appends a
    network access header to the data it receives from the transport layer, creating
    a network access PDU.
    Packet
  29. How communication is achieved by having the corresponding layers in two systems
    communicate.
    Peer Layer
  30. is concerned with specifying the characteristics of the transmission medium the
    nature of the signals, the data rate, and related matters. (Twisted pair,
    optical fiber, satellite, terrestrial microwave). Covers the physical interface
    between a data transmission device and a transmission medium or network.
    Physical Layer
  31. connoting the fact that each application is
    individually accessing he services of the transport layer. (Different
    application addresses within a single computer)
    • Port
  32. communicate by means of formatted blocks of data
    that obey a set of rules or conventions with key features such as syntax,
    semantics, and trimming.
    • Protocol
  33. Protocol data Unit (PDU)
    The combination of data from the next higher layer and control information.
  34. The internet and its underlying local area and wide area networks must include a capability to provide differing levels of
    service to different types of application traffic. Deals with priority, delay
    constraints, delay variability constraints, and other similar requirements.
    Quality of Service (QoS)
  35. connoting
    the fact that each application is individually accessing he services of the
    transport layer. (Different application addresses within a single computer)
    • Service
    • Access Point (SAP)
  36. provides
    a basic electronic mail transport facility. It provides a mechanism for
    transferring messages among separate hosts.
    • Simple
    • Mail Transfer Protocol (SMTP)
  37. provides a secure remote logon capability, which enables a user at a terminal
    or personal computer to logon to a remote computer and function as if directly
    connected to that computer.
    • SSH
    • (Secure Shell)
  38. TCP breaks blocks into smaller pieces to make it
    more manageable. To each of these pieces, TCP appends control information known
    as the TCP header
    • TCP
    • segment
  39. is the most commonly used protocol to provide transport layer. It provides a
    reliable connection for the transfer of data between applications.
    • Transmission
    • Control Protocol (TCP)
  40. collect mechanisms in a common layer shared by
    all applications. That may provide reliable end – to – end service or merely an
    end- to – end delivery service without reliability mechanisms.
    • Transport
    • layer
  41. does not guarantee delivery, preservation of sequence or protection against
    duplication. It enables a procedure to send messages to other procedures with a
    minimum of protocol mechanism.
    • User
    • datagram Protocol (UDP)

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