CCNA 4: Chapter 3 + 5 Vocab

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CCNA 4: Chapter 3 + 5 Vocab
2013-03-18 20:03:18

Accessing the WAN Chapter 3 + 5 Vocab
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  1. Dedicated Lines
    A communications line that is indefinitely reserved for transmissions, rather than switched as transmission is required
  2. Data Link Connection Interface (DLCI)
    A value that specifies a PVC or SVC in Frame Relay network.
  3. Frame Relay Access Device (FRAD)
    Any network device that provides a connection between a LAN and a Frame Relay WAN.
  4. Mesh
    A network topology in which devices are organized in a manageable, segmented manner with many, often redundant, interconnections strategically placed between network nodes.
  5. Link Access Procedure for Frame Relay (LAPF)
    As defined in the ITU Q.922, specifies Frame Mode Services in the Frame Relay network.
  6. Congestion
    Traffic in excess of network capacity.
  7. Forward Explicit Congestion Notification (FECN)
    A bit set by a Frame Relay network to inform the DTE receiving the frame that congestion occurred in the path from source to destination.
  8. Backward Explicit Congestion Notification (BECN)
    A bit set by a Frame Relay network in frames traveling in the opposite direction of frames encountering a congested path.
  9. Star Topology
    A LAN topology in which endpoints on a network are connected to a common central switch by point-to-point links.
  10. Hub
    Generally, a term used to describe a device that serves as the center of a star topology network.
  11. Full-mesh Topology
    A network in which each network node has either a physical circuit or a virtual circuit connecting it to every other network node.
  12. Partial-mesh topology
    A network in which some network nodes are organized in a full mesh and others are connected to only one or two other nodes in the network.
  13. Inverse Address Resolution Protocol (ARP)
    • A method of building dynamic routes in a network.
    • Allows an Access server to discover the network address of a device associated with a virtual circuit.
  14. Local Management Interface (LMI)
    A keepalive mechanism that provides status information about Frame Relay connections between the router (DTE) and the Frame Relay switch (DCE).
  15. Keepalive Interval
    The amount of time between each keepalive message sent by a network device.
  16. Nonbroadcast Multiaccess (NBMA)
    A term describing the multiaccess network that does not support broadcasting (such as X.25) or in which broadcasting is not feasible (for example, an SMDS broadcast group or an extended Ethernet that is too large).
  17. Committed Information Rate (CIR)
    The rate at which a Frame Relay network agrees to transfer info under the normal conditions, averaged over a minimum increment of time.
  18. Excess Burst Size (BE)
    A negotiated tariff metric in Frame Relay internetworks.
  19. Discard Eligible (DE)
    • Also known as tagged traffic.¬†
    • If the network is congested, tagged traffic can be dropped to ensure delivery of higher-priority traffic.
  20. Access Control List (ACL)
    A list kept by Cisco routers to control access to or from the router for a number of services.
  21. Wildcard Mask
    A 32-bit quantity used in conjunction with an IP address to determine which bits in an IP address should be ignored when comparing that address to another IP address.