ICND2: Interconnecting Cisco Networking Devices Part 2 (legacy) — Question 155

Which two encapsulation types can use the keepalive command to monitor the link state of a WAN serial interface? (Choose two.)

Answer options

• A. PPP
• B. LMI
• C. Frame Relay
• D. HDLC
• E. LCP AD

Correct answer:

Explanation

The keepalive command is utilized by PPP and HDLC encapsulation types to check the link state on WAN serial interfaces. Options such as LMI and Frame Relay do not use the keepalive command for this purpose, while LCP AD is not a standard encapsulation type that employs keepalives.