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CCNA ICND1 By Topic - Ethernet Basics Set 2
11 to 20
10
Computer Networking
Professional
05/04/2011

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Term

Ethernet Fundamentals


MAC Addresses consist of?

 

Definition
  • 48 bits in length and expressed as 12 hexadecimal digit

  • The first six hexadecimal digits, which are administered by the IEEE, identify the manufacturer or vendor   

  • This portion of the MAC address is known as the Organizational Unique Identifier (OUI)

  • The remaining six hexadecimal digits represent the interface serial number or another value administered by the manufacture

  • MAC addresses are sometimes referred to as burned-in MAC addresses (BIAs) because they are burned into ROM and are copied into RAM when the NIC initializes


 

Term

Ethernet Fundamentals


Main happenings at the Data-Link Layer

 

Definition

 

  • At the data link layer MAC headers and trailers are added to upper layer data
  • The header and trailer contain control information intended for the data link layer in the destination system
  • The data from upper layers is encapsulated within the data link frame, between the header and trailer, and then sent out on the network
  •  

    Term

      Ethernet Fundamentals


    The NIC uses the -------  to determine if a message should be passed on to the upper layers of the OSI model

     

    Definition
    MAC ADDRESS
    Term

    Ethernet Fundamentals

     

    Ethernet is which commitee standard?


    Which committe created cable standards?

     

    Definition

     

  • IEEE 802.3 committee - MAC Sublayer
  • IEEE 802.2 committee - LLC Logical Link Controller Sublayer

  • EIA/TIA T568A & T568B 

     

    Term

    Ethernet Fundamentals

     

    In CSMA/CD, The logic of waiting to send until the LAN is silent is called

    Definition
    Half Duplex
    Term

    Ethernet Fundamentals

     

    Straigh-through used for?

    Definition

    Hub to router, PC, or file server

    Switch to router, PC, or file server

    Term

    Ethernet Fundamentals

     

    Cross over cable used for?

    Definition

    Hub to hub

    Switch to switch

    Hub to switch

    PC, router, or file server to another PC,router, or file server

    Term

    Ethernet Fundamentals

     

    Computers use __ __ to identify the sender and reciever of an ethernet frame?

    Definition
  • Computers use unicast addresses to identify the sender and receiver of an Ethernet frame
  • Term

    Ethernet Fundamentals

     

    MAC Address is __ bits and __ hex digits


    Which is OUI and which is vendor assigned?

    Definition

    48 bits and 12 hex digits


  • First 6 hex digits are the OUI, last 6 are vendor assigned
  • Term

    Ethernet Fundamentals

     

    What are the 3 types of MAC addressing?

    Definition
    Unicast address A term for a MAC that represents a single LAN interface.
    Broadcast address An address that means “all devices that reside on this LAN right now.”
    Multicast address On Ethernet, a multicast address implies some subset of all devices currently on the Ethernet LAN

     

    IEEE Group (MAC) addressing on Broadcast and Multicast

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