Unix need help!!

4. What is the difference between a full and differential backup? (2pt) 5. What happens to the previous process when cron is scheduled to run a process and it is still running? (2pt) 6. What function does the file /etc/hosts serve? (2pt) 7. Given the following result from dig explain what each part means: (2pt) ;; ANSWER SECTION: facebook.com. dns.facebook.com. 1511986807 7200 1800 604800 120 9 5 120 IN SOA a.ns.facebook.com.

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