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2011-12-12 15:58:47
DCC Chap2

DCC Chap2
Show Answers:

  1. What is the major function of the network access layer?
    To exchange of data between a computer and the network to which it is attached.
  2. What tasks are performed by the transport layer?
    The transport layer is concerned with data reliability and correct sequencing.
  3. What is a protocol?
    A protocol is the set of rules or conventions governing the way in which two entities cooperate to exchange data.
  4. What is a protocol data unit (PDU)?
    A PDU is the combination of data from the next higher communications layer and control information.
  5. What is a protocol architecture?
    The software structure that implements the communications function. Typically, the protocol architecture consists of a layered set of protocols, with one or more protocols at each layer.
  6. What is TCP/IP?
    Transmission Control Protocol/Internet Protocol (TCP/IP) are two protocols originally designed to provide low level support for internetworking. The term is also used generically to refer to a more comprehensive collection of protocols developed by the U.S. Department of Defense and the Internet community.
  7. What are some advantages to layering as seen in the TCP/IP architecture?
    Layering decomposes the overall communications problem into a number of more manageable subproblems.
  8. What is a router?
    A router is a device that operates at the Network layer of the OSI model to connect dissimilar networks.
  9. Which version of IP is the most prevalent today?
  10. Does all traffic running on the internet use TCP?
    No, other transport layer protocols, such as UDP, are also used. Some traffic uses no transport protocol, such as ICMP.
  11. Compare the address space between IPv4 and IPv6. How many bits are used in each?
    IPv4 - 32 bits; IPv6 - 128 bits