Which three statements about Cisco HDLC are true? (Choose three.)
A.
HDLC serial encapsulation provides asynchronous framing and error detection.
B.
Serial link keepalives are maintained by SLARP.
C.
HDLC serial encapsulation provides synchronous framing without retransmission.
D.
HDLC frame size can be reduced with MPPC compression.
E.
The interface is brought down after five ignored keepalives.
The interface is brought down after three ignored keepalives.
E.
The interface is brought down after five ignored keepalives.
The interface is brought down after three ignored keepalives.
Admin: The answer on this question is messed up.
Should be B, C, and three ignored keepalives.
Explanation:
Cisco High-Level Data Link Controller (HDLC) is the Cisco proprietary protocol for sending data
over synchronous serial links using HDLC. Cisco HDLC also provides a simple control protocol
called Serial Line Address Resolution Protocol (SLARP) to maintain serial link keepalives. For
each encapsulation type, a certain number of keepalives ignored by a peer triggers the serial
interface to transition to the down state. For HDLC encapsulation, three ignored keepalives causes
the interface to be brought down.
By default, synchronous serial lines use the High-Level Data Link Control (HDLC) serial
encapsulation method, which provides the synchronous framing and error detection functions of
HDLC without windowing or retransmission.
Reference.
http://www.cisco.com/c/en/us/td/docs/routers/access/800/819/software/configuration/Guide/819_S
CG/6ser_conf.html#78662
QUESTION NO:
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