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Terms
Concepts
Mapping
Config
Advanced
100
A bit sent in reverse direction to the data flow. It is set by a Frame Relay network to notify an interface device (DTE) that congestion avoidance procedures should be initiated by the sending device.
What is backward explicit congestion notification (BECN)?
100
two ways to establish a virtual circuit
What are switched virtual circuits (SVC) and permanent virtual circuits (PVC)?
100
obtains Layer 3 addresses of other stations from Layer 2 addresses, such as the DLCI in Frame Relay networks
What is Inverse Address Resolution Protocol or Inverse-ARP?
100
the interface configuration command enables Frame Relay encapsulation and allows Frame Relay processing on the supported interface
What is encapsulation frame-relay?
100
technique used to prevent a routing loop in networks using distance vector routing protocols
What is split horizon?
200
The range of frequencies, expressed in kilobits per second (kbps), that can pass over a given data transmission channel within a Frame Relay network
What is bandwidth?
200
VCs established dynamically by sending signaling messages to the network (CALL SETUP, DATA TRANSFER, IDLE, CALL TERMINATION).
What is switched virtual circuits (SVCs)?
200
relies on Inverse ARP to resolve a next hop network protocol address to a local DLCI value
What is dynamic mapping?
200
command to set the bandwidth of the serial interface
What is bandwidth?
200
reduce routing loops by preventing a routing update received on one interface to be forwarded out the same interface
What is split horizon updates?
300
The rate at which a Frame Relay network agrees to transfer information under normal conditions, averaged over time interval Tc
What is committed information rate (CIR)?
300
VCs preconfigured by the carrier, and after they are set up, only operate in DATA TRANSFER and IDLE modes?
What is permanent virtual circuit (PVC)?
300
(TRUE or FALSE) Dynamic mapping is enabled by default for all protocols enabled on the physical interface of all Cisco routers
What is TRUE?
300
command to configure dynamic mapping on an interface in Cisco routers
What is none?
300
creating subinterfaces solves this kind of reachability problem
What is split horizon?
400
A unique number assigned to a permanent virtual circuit (PVC) end point in a Frame Relay network
What is data-link connection identifier (DLCI)?
400
property of DLCI which means that the values themselves are not unique in the Frame Relay WAN.
What is local significance?
400
FR uses a "best-effort" technique, which means it simply _______ packets when it detects errors, leaving any necessary error-correction up to the end-points.
What is drops?
400
keyword allows broadcasts and multicasts over the PVC and, in effect, turns the broadcast into a unicast so that the other node gets the routing updates.
What is broadcast?
400
this great advantage of Frame Relay allows any network capacity that is being unused is made available or shared with all customers, usually at no extra charge.
What is bursting?
500
A set of enhancements to the basic Frame Relay specification which includes support for a keepalive mechanism, which verifies that data is flowing, and for a status mechanism, which provides an on-going status report on the DLCIs known to the switch
What is Local Management Interface (LMI)?
500
The header and trailer are defined by this specification
What is Link Access Procedure for Frame Relay (LAPF) Bearer Services specification, ITU Q.922-A ?
500
a definition of the messages used between the DTE (R1) and the DCE (the Frame Relay switch owned by the service provider)
What is Local Management Interface (LMI)?
500
to verify the Frame Relay mapping
What is show frame-relay map
500
Frame Relay reduces network overhead by implementing two simple congestion-notification mechanisms
What are the Forward Explicit Congestion Notification (FECN) and the Backward Explicit Congestion Notification (BECN)?