Which two encapsulation types can use the keepalive command to monitor the link state of a WAN serial interface? (Choose two.)
A. PPP
B. LMI
C. Frame Relay
D. HDLC
E. LCP
Which two encapsulation types can use the keepalive command to monitor the link state of a WAN serial interface? (Choose two.)
A. PPP
B. LMI
C. Frame Relay
D. HDLC
E. LCP