201-450 Online Practice Questions and Answers

Which of the following tools are used to measure memory usage? (Choose THREE correct answers.)

A. mpstat

B. pstree

C. sar

D. top

E. vmstat

Which commands are used to load modules into the Linux kernel? (Choose TWO correct answers.)

A. insmod

B. loadmod

C. kernload

D. modprobe

E. probemod

What is the correct parameter to pass to the kernel at boot time to force it to use only one of the available processors?

A. maxcpus=1

B. usecpus=1

C. smpcpus=1

D. vcpumx=1

What happens if the Linux kernel can't mount the root filesystem when booting?

A. An error message is shown and the administrator is asked by the kernel to specify a valid root filesystem to continue the boot process.

B. An error message is shown and the system reboots after a keypress.

C. An error message is shown and the system boots in maintenance mode.

D. An error message is shown showing which device couldn't be mounted or informing that init couldn't be found.

E. An error message is shown stating that the corresponding kernel module couldn't be loaded.

Which of the following best describes the format of the /etc/fstab file?

A. device name; filesystem type; mount point; mount options; dump filesystem; fsck order

B. device name; mount point; filesystem type; mount options; dump filesystem; fsck order

C. device name; mount point; mount options; filesystem type; dump filesystem; fsck order

D. mount point; filesystem type; device name; mount options; dump filesystem; fsck order

E. mount point; device name; filesystem type; mount options; dump filesystem; fsck order

What command is used to make an exact copy, at a single point in time, of a logical volume for backup purposes?

A. lvsnap

B. lvsnapshot

C. lvcreate

D. lvcopy

E. lvclone

The main configuration file for autofs has this entry:

/home /etc/auto.home

What is the meaning of the /etc/auto.home file?

A. It has the indirect maps for the mounting of file systems.

B. It has configuration information, such as passwords and keys, for the remote file server.

C. It has configuration information on settings for the /home mount point.

D. It is the holds the SSL key to allow authentication to the remote file server.

Which of the following commands can be used to script interactions with various TCP or UDP services?

A. ftp

B. nc

C. tcpdump

D. strings

E. wget

A database application requires a maximum shared memory segment (shmmax) of 2GB (2147483648

Bytes).

Which configuration file should be modified to set this kernel parameter permanently? (Specify the full

name of the file, including path.)

The users of the local network complain that name resolution is not fast enough. Enter the command, without the path or any options, that shows the time taken to resolve a DNS query.