Which three are optional extensions of the Frame Relay Local Management Interface
specification? (Choose three)

A.
switched virtual circuit

B.
virtual circuit status

C.
simple flow control

D.
multicasting

E.
permanent virtual circuit

Explanation:
http://www.cisco.com/en/US/docs/internetworking/troubleshooting/guide/tr1918.htm
#wp1020573lLMI ExtensionsIn addition to the basic Frame Relay protocol functions for
transferring data, the consortium Frame Relay specification includes LMI extensions that make
supporting large, complex internetworks easier. Some LMI extensions are referred to as
“common” and are expected to be implemented by everyone who adopts the specification. Other
LMI functions are referred to as “optional.” A summary of the LMI extensions follows:•Virtual circuit
status messages (common)—Provide communication and synchronization between the network
and the user device, periodically reporting the existence of new PVCs and the deletion of already
existing PVCs, and generally provide information about PVC integrity. Virtual circuit status
messages prevent the sending of data into black holes—that is, over PVCs that no longer
exist.•Multicasting (optional)—Allows a sender to transmit a single frame but have it delivered by
the network to multiple recipients. Thus, multicasting supports the efficient conveyance of routing
protocol messages and address resolution procedures that typically must be sent to many
destinations simultaneously.•Global addressing (optional)—Gives connection identifiers global
rather than local significance, allowing them to be used to identify a specific interface to the Frame
Relay network. Global addressing makes the Frame Relay network resemble a local-area network
(LAN) in terms of addressing; Address Resolution Protocols, therefore, perform over Frame Relay

exactly as they do over a LAN.•Simple flow control (optional)—Provides for an XON/XOFF flow
control mechanism that applies to the entire Frame Relay interface. It is intended for devices
whose higher layers cannot use the congestion notification bits and that need some level of flow
control.