Linux Technical Interview Questions and Answers for freshers pdf

Linux System Administrator Interview Questions and Answers, Redhat Linux interview questions and answers pdf
1.  What is GRUB?
2.  Which files are called for user profile by default when a user gets login
3.  Which file needs to update if srequired to change default runlevel 5 to 3
4.  What command used for showing user info like Login Name, Canonical Name, Home Directory,Shell etc..
5.  What is inode number
6.  How can we increase disk read performance in single command
7.  Command used to lock user password
8.  How many default number of Shells available and what are their names?
9.  What is the path of network (ethX) configuration files
10. How can we change speed and make full duplex settings for eth0
11. File which stores the DNS configuration
12. Main configuration file and command used for NFS enabling exported directories and deamons
13. What is command to check ports running/used over local machine
14. What is the difference between soft and hard links
15. Display or Kill all processes which are accessing any folder/file
16. Kill any user's all processes
17. What we have to do if we do required to rotate logs without moving and creating new log file
18. What is the difference between cron and anacron
19. Default Port numbers used by ssh,ftp,http,https,telnet,smtp,pop3,pop3s,imap,imaps
20. How to setup ACLs in following case:
21. How to make USB bootable?
22. How can we check disk/device status/failure/errors using smartctl utility?
23. What is the difference between ext2 vs ext3 vs ext4?
24. Disable ping to avoid network/ICMP flood
24. What is SYN Flood, ICMP Flood
25. How to setup Password less remote login/ssh?
26. How do you monitor or measure performance of a Linux server which is running for more than 5 years with out a break?
27. Explain how DNS works, and talk about DNS Table?
28. Talk about the boot process?
29. What utility do we have to use for a log to rotate automatically?
30. How do we store an application’s documentation?
31. How is a new user account created?
32. In what way is IMAP different than POP3?
33. What type of file server do we have on a Linux server?
34. What is the meaning of Linux Shell and Shell Script?
35. How is the SATA hard disk configuration made when we install Redhat 9?
36. Can you give a detailed explanation on how the boot process of the Linux version you like happens?
37. How can we describe a Stateless Linux server and what are its features?
38. What daemon does the event tracking in Linux?
39. How can we define SELinux?
40. Which is the recommended size for the swap space partition?
41. What do we use for managing hash table collisions?
42. How can we recover a file that was deleted in Linux?
43. How can we see the boot messages?
44. How do we give a shadow password?
45. In what way are home directories different from working directory?
46. What separates Unix Linux?
47. Which is the required command for checking the file system?
48. What is the difference between UNIX and LINUX?
49. What is the basic difference between BASH and DOS?
50. How do you open a command prompt when issuing a command?
51. What could possibly be the problem when a command that was issued gave a different result from the last time it was used?
52. What are the contents in /usr/local?
53. How do you terminate an ongoing process?
54. How do you insert comments in the command line prompt?
55. What is command grouping and how does it work?