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Considering the output of the command: show frame-relay map as shown here, which statement correctly describes the meaning of the word: CISCO ?
Serial 1 (administratively down): ip 172.16.0.1 dlci 123 (0xB1, 0x2C10), static, broadcast, CISCO
It refers to the frame-relay encapsulation method which conforms with RFC 1490
The word "CISCO" Indicates the encapsulation type for this map; either CISCO or IETF.
The word "CISCO "represents the LMI signaling types used between CPE and Telco side
The word "CISCO" indicates that this map was dynamically discovered through Cisco's proprietary InverseARP
The word CISCO from the output is an optional and default Cisco encapsulation type (other type is IETF which conforms with RFC 1490). This is a 4 bytes header, 2 bytes for DLCI identification and 2 bytes for packet type identification. Frame-relay LMI specifications are ANSI, q933a, and CISCO (though the question is about the output of show frame-relay map NOT show frame-relay lmi). LMI specifications differ with encapsulation types. LMI types are the signaling standards between a router (CPE) and FR switch (Telco). It serves as the heartbeat of the link between the two devices which verifies the flow of data on that link. Encapsulation types deal with the framing of a frame-relay packet. IEEE and 802.1Q (Trunking) has nothing to with question. (http://www.cisco.com/c/en/us/td/docs/ios/122/wan/command/reference/fwan_r/wrffr4.html#wp1029196)
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