By default, how frequently does the designated intermediate system (DIS) send out its hello packets?

A.
3 seconds

B.
6 seconds

C.
9 seconds

D.
12 seconds

Explanation:
hello-interval seconds;

Hierarchy Level
[edit logical-systems logical-system-name protocols isis interface interface-name level level-number],
[edit logical-systems logical-system-name routing-instances routing-instance-name protocols isis interface interface-name level level-number],
[edit protocols isis interface interface-name level level-number],
[edit routing-instances routing-instance-name protocols isis interface interface-name level level-number]

Description

Frequency with which the routing device sends hello packets out of an interface, inseconds.

Options

secondsFrequency of transmission for hello packets.

Range: 1 through 20,000seconds

Default: 3seconds (for designated intermediate system [DIS] routers), 9seconds (for non-DIS routers)