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.
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