CCNA:ICND2 vocab sec 1

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shamgar_bn
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224462
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CCNA:ICND2 vocab sec 1
Updated:
2014-05-20 21:08:37
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Cisco CCNA ICND2 Vocab
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Description:
Vocabulary for section 1 of Cisco's CCNA ICND2
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  1. IEEE 802.1q
    VLAN trunking protocol. Includes the concept of a native VLAN, for which no VLAN header is added, and a 4-byte VLAN header is inserted after the original frame's type/length field.
  2. ISL
    (Inter-Switch Link) The Cisco proprietary VLAN trunking protocol that predated 802.1q by many years. ISL defines a 26-byte header that encapsulates the original Ethernet frame.
  3. trunk
    In campus LANs, an Ethernet segment over which the devices add a VLAN header that identifies the VLAN in which the frame exists.
  4. trunking
    Also called VLAN trunking. A method to support multiple VLANs that have members on more than one switch.
  5. trunking administrative mode
    The configured setting on a Cisco switch interface, as configured with the 'switchport mode' command
  6. trunking operational mode
    The current behavior of a Cisco switch interface for VLAN trunking
  7. VLAN
    (Virtual Local Area Network) A group of devices connected to one or more switches that are grouped into a single broadcast domain through configuration. VLANs allow switch administrators to place the devices connected to the switches in separate VLANs without requiring separate physical switches. This creates design advantages of separating the traffic without the expense of buying additional hardware.
  8. VLAN configuration database
    The name of the collective configuration of VLAN IDs and names on a Cisco switch.
  9. vlan.dat
    The default file used to store a Cisco switch's VLAN configuration database.
  10. VTP
    (VLAN Trunking Protocol) A Cisco-proprietary messaging protocol used between Cisco switches to communicate configuration information about the existence of VLANs, including the VLAN ID and VLAN name.
  11. VTP client mode
    One of three VTP operational modes for a switch with which switches learn about VLAN numbers and names from other switches, but which does not allow the switch to be directly configured with VLAN information.
  12. VTP pruning
    The VTP feature by which switches dynamically choose interfaces on which to prevent the flooding of frames in certain VLANs when the frames do not need to go to every switch on the network.
  13. VTP server mode
    One of three sets of operating characteristics (modes) in VTP. Switches in server mode can configure VLANs, tell other switches about changes, and learn abut VLAN changes from other switches.
  14. VTP transparent mode
    One of three sets of operating characteristics (modes) in VTP. Switches in transparent mode can configure VLANs, but they do not tell other switches about the changes, and they do not learn about VLAN changes from other switches.
  15. alternate port
    In RSTP 802.1w, a port role used to denote an interface that is currently receiving an inferior Hello BDPU, making it a possible replacement for the root port. Also used in the Cisco 802.1d STP implementation.
  16. backup port
    In RSTP 802.1w, a port told used when multiple interfaces on one switch connect to a single collision domain. This makes one interface the designated port (DP), and one or more others become available to replace the DP (backup role).
  17. Blocking State
    In 802.1d STP, a port state in which no received frames are processed, and the switch forwards no frames out the interface, with the exception of STP messages.
  18. BPDU Guard
    A Cisco switch feature that listens for incoming STP BDPU messages, disabling the interface if any are received. The goal is to prevent loops when a switch connects to a port expected to only have a host connected to it.
  19. bridge ID (BID)
    An 8-byte identifier for bridges and switches used by STP and RSTP. It is composed of a 2-byte priority field followed by a 6-byte System ID field that is usually filled with a MAC address.
  20. BPDU
    (Bridge Protocol Data Unit) The generic name for STP messages.
  21. designated port
    In both STP and RSTP, a port role used to determine which of multiple interfaces, each connected to the same segment or collision domain, should forward frames to the segment. The switch advertising the lowest-cost Hello BPDU onto the segment becomes the DP.
  22. Discarding State
    An RSTP interface state in which no received frames are processed, and the switch forwards no frames out the interface, with the exception of RSTP messages.
  23. EtherChannel
    A Cisco-proprietary feature in which up to eight parallel Ethernet segments between the same two devices, each using the same speed, can be combined to act as a single link for forwarding and STP logic.
  24. forward delay
    An STP timer, defaulting to 15 seconds, used to dictate how long an interface stays in both the Listening State and Learning State. Also called the forward delay timer.
  25. Forwarding State
    An STP and RSTP port state in which an interface operates unrestricted by STP.
  26. Hello BPDU
    The STP and RSTP message used for the majority of STP communications, listening to the root's Bridge ID, the sending device's Bridge ID, and the sending device's cost with which to reach the root.
  27. IEEE 802.1d
    Spanning Tree Protocol (STP)
  28. IEEE 802.1s
    Multiple Instances of Spanning Tree (MIST), which allows for load balancing of traffic among different VLANs
  29. IEEE 802.1w
    Rapid Spanning Tree Protocol (RSTP)
  30. Inferior Hello
    When comparing two or more received Hello BDPUs, a Hello that lists a numerically larger root Bridge ID than another Hello, or a Hello that lists the same root Bridge ID but with a larger cost.
  31. Learning State
    In STP, a temporary port state in which the interface does not forward frames, but it can begin to learn MAC addresses from frames received on the interface.
  32. Listening State
    A temporary STP port state that occurs immediately when a blocking interface must be moved to a Forwarding State. The switch times out MAC table entries during this state. It also ignores frames received on the interface and doesn't forward any frames out the interface.
  33. MaxAge
    In STP, a timer that states how long a switch should wait when it no longer receives Hellos from the root switch before acting to reconverge the STP topology. Also called the MaxAge timer.
  34. PortFast
    A with STP feature in which a port is placed in a STP Forwarding State as soon as the interface comes up, bypassing the Listening and Learning states. This feature is meant for ports connected to end-user devices.
  35. RSTP
    (Rapid Spanning Tree Protocol) Defines an improved version of STP that converges much more quickly and consistently than STP.
  36. root port
    In STP, the one port on a nonroot switch in which the least-cost Hello is received. Switches put root ports in a Forwarding State.
  37. root switch
    In STP, the switch that wins the election by virtue of having the lowest Bridge ID, and, as a result, sends periodic Hello BPDUs (the default is 2 seconds).
  38. STP
    (Spanning Tree Protocol) Allows switches and bridges to create a redundant LAN, with the protocol dynamically causing some ports to block traffic, so that the bridge/switch forwarding logic will not cause frames to loop indefinitely around the LAN.

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