User has lost root password, how do you reset?
init 1, change root password... I missed this one.
"init 1" doesn't always work, if you're not already root some systems will ask you for root password, and if you're not logged into the system ? What always works is to boot of a live CD, mount the file system with /etc, edit the /etc/passwd, /etc/shadow file.
Actually the easiest way to do this is to single the box in run-level 1 then use the standard passwd tools to update the hash. That's far simpler than using a live cd and editing the shadow file. This a network based kvm. is an operation that can be done at the DC or over ipmi or
There are two directly-connected switches. Assume that they communicate fine on the physical layer. Why can't two hosts with assigned addresses 192.168.100.5/30 and 192.168.100.50/30 communicate with each other? Also assume that network addresses can be used. How would you remedy this by swapping out only ONE of the devices on the network?