When configuring a serial interface on a router, what is the default encapsulation?
A.
atm-dxi
B.
frame-relay
C.
hdlc
D.
lapb
E.
PPP
Explanation:
This question is to examine the data link layer protocols.
LAPB: Link Access Procedure Balanced for x.25 PPP: Point-to-Point Protocol HDLC: High-Level Data Link Control
Frame-relay and the three protocols above are data link layer protocols. HDLC is the default serial encapsulation protocol. The correct answer is C.