21-

Exclusion addresses in DHCP means:

a.

cant be change from root

b.

none

c.

Use only one ip to certain device

d.

use MAC address to prevent distribute IPs.

38-

The command !88 means

a.

Execute the line 88 on any shell script

b.

Execute the line 88 in history bash shell

c.

Its a logical expression in shell scripts

d.

Inverter the line 88 in script file.