How a service is always running ?

Hi
How ssh service at all levels always running in her file /etc/inittab?

vi /etc/inittab 

 10::respawn:/etc/init.d/sshd

I added this line
& save

run init q

But it did not

run level 10 ?

No id 10
In All runlevels always runing

What Red Hat Version do you have running?

Redhat is not
Cent os 6.7

Doesn't /etc/init.d/sshd need the "start" parameter?

What's the reason you don't want the default startup mode? SSHD is running always normally - except when there's no networking(single user mode).