21) How do you stop users from using their own crontab
Make sure userid is not in cron.allow or is present in cron.deny
22) Show a crontab entry that will run '/usr/local/bin/myscript' on the first Monday of each month?
0 4 1-7 * 1 /usr/local/bin/myscript
23) Can you explain what a context switch is?
A context switch is the switching of the CPU from one process or thread to another
24) Given a network of 192.168.7.0 and a netmask of 255.255.255.192, answer the following:
a) How many IP addresses are available for hosts?
62
b) What is the broadcast address?
192.168.7.63
c) How would this be written in CIDR notation? 192.168.7.0/26
d) I decide to split this subnet by odd and even numbered IP addresses, how would I achieve this?
Change the netmask to 255.255.255.193