Latest Feb-2023 201-450 Dumps PDF And Certification Training [Q50-Q68] : Top Exam Collection : http://blog.topexamcollection.com

Q50. In the following output from top, which processes contribute to the percentage of time that the CPU spends in the state of wa?
Tasks: 193 total, 1 running, 190 sleeping, 2 stopped, 0 zombie
Cpu(s): 0.5%us, 0.3%sy, 0.0%ni, 98.2%id, 1.0%wa, 0.0%hi, 0.0%si, 0.0%st

Processes waiting for user interaction.

Processes that were already closed and are waiting to be launched again.

Processes that have not been scheduled yet because they haven’t been fully loaded into RAM or are in swap.

Processes waiting for IO operations to complete.

Q51. CORRECT TEXT
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.

Q52. On a Linux node with multiple active network interfaces, each having a default route to the Internet, which default route is preferred?

The default route with the highest metric value

The default route with the highest MTU value

The default route with the lowest TTL value

The default route with the highest TTL value

The default route with the lowest metric value

Q53. Which single command simulates a failed device within a RAID 5 array?

mdadm –remove /dev/md0 /dev/sdd1

mdadm –zero-superblock /dev/sdf3

mdadm –force-fault /dev/md2 /dev/sde2

mdadm –fail /dev/md0 /dev/sdc1

mdadm /dev/md0 –offline /dev/sdc1

Q54. Which /etc/hosts.allow entries will permit access to sshd for users from the 192.168.1.0/24 subnet? (Choose TWO correct answers.)

sshd : 192.168.1.

sshd : 192.168.1

sshd : 192.168.1.0 netmask 255.255.255.0

sshd : 192.168.1.0/255.255.255.0

sshd : 192.168.1.0

Q55. Which command can be used to scan a specified network looking for IP addresses that appear to be in use?

nmap

tcpdump

netscan

hostdiscover

Q56. How can the label rootbe added to the ext4 filesystem on /dev/sda1?

relabel /dev/sda1 root

tune2fs -L root /dev/sda1

echo ‘root’ > /proc/fs/sda1/label

labelfs –device /dev/sda1 root

Q57. What is the purpose of the smartd daemon?

It is a user space daemon used for reading smart cards and integrated circuit chips.

It attempts to automatically repair file systems upon a failed file system check.

It monitors process activity and helps the kernel decide which processes to kill when the kernel overcommits.

It monitors certain disk drives and attempts to predict when they will fail.

Q58. CORRECT TEXT
What command will remove a physical volume from a volume group? (Specify ONLY the command without any path or parameters.)

Q59. Which files are updated as devices are mounted and unmounted to provide information on the currently mounted devices and the options used? (Choose TWO correct answers.)

/proc/dtab

/etc/mtab

/etc/fstab

/proc/mounts

/proc/devices

Q60. Which of the following commands erases the contents of the /dev/sdb3partition?

rm /dev/sdb3

dd if=/dev/zero of=/dev/sdb3

dd of=/dev/zero if=/dev/sdb3

umount /dev/sdb3

Q61. Which of the following command sequences can be used to extract files contained in a initramfs file (/boot/initramfs) which is used by the kernel at boot time?

cp /boot/initramfs /tmp/initramfs.gz; gzip -c /tmp/initramfs.gz; mkdir /tmp/initramfs.dir ; cd
/tmp/initramfs.dir ; cpio -i < /tmp/initramfs

cp /boot/initramfs /tmp/initramfs.gz; gunzip /tmp/initramfs.gz; mkdir /tmp/initramfs.dir ; cd
/tmp/initramfs.dir ; cpio -i < /tmp/initramfs

cp /boot/initramfs /tmp/initramfs.gz; gunzip /tmp/initramfs.gz; mount /tmp/initramfs /mnt/ – o loop -t initramfs

cp /boot/initramfs /tmp/initramfs.gz; gunzip /tmp/initramfs.gz; mkdir /tmp/initramfs.dir ; cd
/tmp/initramfs.dir ; cpio -e /tmp/initramfs

cp /boot/initramfs /tmp/initramfs.gz; gunzip /tmp/initramfs.gz; mount /tmp/initramfs /mnt/ – o loop -t initrd

Q62. Which of the following configuration files are used by tcpwrapper?

/etc/tcpd.allow and etc/tcpd.deny

/etc/tcpwrapper.allow and /etc/tcpwrapper.deny

/etc/hosts.allow and /etc/hosts.deny

/etc/access.allow and /etc/access.deny

/etc/service.allow and /etc/service.deny

Q63. Which of the following commands will provide the PIDs of the processes sorted by which are using the most CPU cycles on the Linux system?

top

uptime

ps aux

vmstat

freemem

Q64. A network client has an ethernet interface (eth0) configured with an IP address in the subnet 192.168.0.0/24. This subnet has a router, with the IP address 192.168.0.1, that connects this subnet to the Internet. What needs to be done on the client to enable it to use the router as its default gateway? (Choose TWO correct answers.)

route add default gw 192.168.0.1 eth0

ifconfig eth0 defaultroute 192.168.0.1

ip route add default via 192.168.0.1 dev eth0

echo defaultroute 192.168.0.1 >> /etc/resolv.conf

route add defaultgw=192.168.0.1 if=eth0

Q65. CORRECT TEXT
Which keyword is used in the /etc/inittab file to define the SysV-init default system runlevel?

Q66. A system with SysV-init has a service installed called apache2. Which file controls the start and stop of this service and is referenced by the various runlevel directories?

/etc/init.d/apache2

/etc/rc2.d/70apache2

/etc/rc2.d/apache2

/etc/rc2.d/apache2.start

Q67. Which of the following init systems comes along with an own UEFI boot loader?

systemd

SysVinit

Upstart

OpenRC

launchd

Q68. Which command reports information on memory usage, paging and block input/output?

free

memshow

lsof

pidof

vmstat

Latest Feb-2023 201-450 Dumps PDF And Certification Training [Q50-Q68]

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