Which two statements are true?

You are monitoring the control plane traffic using a network analyzer on an Ethernet network
segment with all routers configured with IS-IS routing. Which two statements are true? (Choose
two.)

A.
DIS will send hellos more frequently than other IS-IS devices.

B.
L1 and L2 hellos are combined in a single hello packet.

C.
PSNPs are sent periodically.

D.
Only the DIS will send CSNPs periodically.

Explanation: