Linux Admin Question Answers

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1. File to allow remote host ———————etc/hosts.allow
2. Global profile in RHEL6 ———————/etc/profile
3. Create snap shot logical volume —————lvcreate
4. Kernel image file of linux —————–vmlinuX
5. To see the content run level —————–runlevel / who –r
6. Deamon for cron ———————crond
7. Which daemon not used in NFS —————NFS

8. File type which link across filesystem ———————soft link

9. To display shell’s environment variables——————— env

10 Change run level of a service ———————Chkconfig

11. Daemon for ftp ———————vsftpd
12. Sysuser as secondary group for user1 users ——————— usermod -G sysusers user1
13. User needs to connect securely and mandatorily encypt the password————–ssh
14. To list all possible partition types ans their partition ids —————fdisk -l
15. you have a /data directory on your system and want to give full permission to owner and group member and no permission to others ——- Chmod 770 /data
16. you have a /data directory on your system and want to give full
    permission to owner and group member and no permission to others —- /etc/squid/squid.conf
17. Static files of bootloader is installed in – /boot
18. Daemon not required to run NFS —- NFS
19. Daemon used for crontab —- crond
20. Command used to create snap of logical volumes —— lvcreate
21. Daemon process for ftp in RHEL 6 – vsftpd
22. Which Ffilesystem support in Linux – htfs
23. Which runlevel support NFS – 3
24. User needs to connect securely and mandatorily encypt the password- ssh
25. Default shell of linux – bash
26. System file to allow remote host access – /etc/hosts.allow
27. History commnad to display last 5 commands – history 5
28. Which password command will lock user account – passwd -l
29. Sysuser as secondary group for user1 users – usermod -G sysusers user1
    soft link
30. File type which link across filesystem – soft link
31. To display shell’s environment variables – env(also printenv)
32. To add script/service to auto load at boot time – chkconfig -add
33. To list all possible partition types ans their partition ids – fdisk -l
34. To see system default routing tables – netstat -rn
35. To mount ro filesytem /mount to rw filesystem – mount -o remount,rw
    /mount
36. With which option e2fsck wil check and automatically repair filesystem
    without prompting – e2fsck -p
37. /dev contains → special device files for all devices
38. NFS share configs files is in → /etc/exports
39. Create snap shot logical volume → lvcreate
40. Command to change run level → init, /etc/inittab
41. To see the content run level → runlevel / who –r
42. netstat –rn → display routing with kernel & IP
43. Netstat –in → display routing table Display a table of all network interfaces with
    interface & IP
44. Show IP route → list routing table
45. deamon for cron → crond
46. Prevent user form logging in → usermod –s /sbin/nologin username
47. Boot file location in Linux → /boot
48. Unmount forcefully → umount –f /mnt
49. File in which DNS is configured → /etc/resolv.conf
50. Kernel version in Linux → uname –r
51. Global profile in RHEL6 → /etc/profile
52. File to allow remote host → /etc/hosts.allow
53. To lock user account → passwd –l
54. To unlock user account → passwd –u
55. Command to remove link –? Rm / unlink
56. env display → env, print env
57. Change runlevel of a service –? Chkconfig
58. Daemon for ftp → vsftpd
59. Command to see the file system type → df –T
60. Which daemon not used in NFS → NFS
61. Securely accessing servers → SSH
62. Path to connect a machine from remote → hosts.allow
    
63. Command to generate a RSA key pair –? Ssh –keygen –t rsa / ssh –keygen
    IPV4=32bit
    IPV6=128bit
    RPM config creation file –rpm –qla
    Df → displays all the device names, blocks, mounts
    Df –a → displays information about filesystem usuage and memory utilization
    Df –h → human readable TB, KB, MB
    Df- T→display type of file system
    Df –k→ block as byte
    Df –t ext3 → display only the filesystem which are of ext3
    Df –X ext3 → extends ext3 and display other filesystems
    DU – Disk usuage
    MAC address uses–? Hexa decimal numbers
    Du –h /home/adm → human readale
    /bin→ all executables are located
    /dev → device drivers
    /etc → config files, disk config files
    /lib→ library files
    RAID 0 → striping. High performance, zero fault tolerance. W/R good performance
    RAID 1 → Mirroring. Good performance, Full fault tolerance, used in small scale
    RSA minimum key length → 768
    Default length → 2048
    Key length for RSA is always → 1024 bits
    Kernel image file of linux → vmlinux
    which initialization script executed after all other init scripts → /etc/rc.local
    ls /etc/*.conf