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質問 194
A new corporate policy states that Bluetooth should be disabled on all company laptops. Which of the following commands would disable the use of Bluetooth?
- A. echo "blacklist bluetooth" > /etc/modprobe.d/blacklist-bluetooth
- B. echo "rmod bluetooth" > /etc/modprobe.d/rmmod-bluetooth
- C. echo "modprobe bluetooth" > /etc/modprobe.d/modprbe-bluetooth
- D. echo "kill bluetooth" > /etc/modprobe.d/kill-bluetooth
正解: C
質問 195
A junior administrator is migrating a virtual machine from a Type 1 hypervisor to a Type 2 hypervisor. To ensure portability, which of the following formats should the administrator export from the Type 1 hypervisor to ensure compatibility?
- A. OWASP
- B. OVA
- C. VDI
- D. VMDK
正解: B
解説:
Reference:
https://docs.vmware.com/en/VMware-Fusion/11/com.vmware.fusion.using.doc/GUID-16E390B1-829D-4289-8442-270A474C106A.html
質問 196
A systems administrator configured a new kernel module, but it stopped working after reboot. Which of the following will allow the systems administrator to check for module problems during server startup?
- A. lsmod
- B. modprobe
- C. modinfo
- D. dmesg
正解: C
解説:
Reference:
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/6/html/deployment_guide/sec-displaying_information_about_a_module
質問 197
A four-drive Linux NAS has been improperly configured. Each drive has a capacity of 6TB, for a total storage capacity of 24TB. To reconfigure this unit to be not pluggable for drive replacement and provide total storage of
11TB to 12TB, which of the following would be the correct RAID configuration?
- A. RAID 03
- B. RAID 10
- C. RAID 01
- D. RAID 50
正解: B
質問 198
Which of the following would be used to check a sensor input to a Linux system?
- A. SCSI
- B. HBA
- C. SATA
- D. GPIO
正解: A
質問 199
A junior Linux administrator is trying to verify connectivity to the remote host host1and display round-trip statistics for ten ICMP requests.
Which of the following commands should the administrator execute?
- A. traceroute -c 10 host1
- B. pathping -c 10 host1
- C. ping -c 10 host1
- D. netstat host1
正解: C
解説:
Explanation/Reference: https://shapeshed.com/unix-ping/
質問 200
Which of the following will provide a list of all flash, external, internal, and SSD drives?
- A. lsmod
- B. lsusb
- C. lspci
- D. lsblk
正解: D
解説:
Explanation/Reference: https://www.linux.com/learn/intro-to-linux/2017/3/how-format-storage-devices-linux
質問 201
A Linux administrator configured several network interfaces to be used for backup. The administrator entered the following commands:
After the last command, a new interlace appeared as connected and worked until the Linux system was rebooted. After the reboot, the Interface did not connect properly. Which of the following configuration changes are needed to ensure that the Interface connects automatically?
- A. The backup Interface should be reconfigured with a / 2 4 subnet mask.
- B. autoconnect yes should be added to the interface configuration.
- C. mcli conn up backup should be executed
- D. ip link set eth1 should be performed.
正解: A
質問 202
While trying to access a website hosted on the server, the systems administrator receives the following error message:
The administrator then performs some diagnostics:
Which of the following commands should the administrator use to fix the issue?
- A. chown -R www:www /var/www/website
- B. chmod -R 777 /var/www/website
- C. restorecon /var/www/html/website/index.html
- D. chcon -t httpd_sys_content_t /etc/httpd
正解: C
質問 203
A Linux administrator needs to back up the folder /usr/domain, and the output must be a gzip compressed tar. Which of the following commands should be used?
- A. tar -cvf /usr/domain domain.tar.gz
- B. tar -cxzv /usr/domain domain.tar.gz
- C. tar -czvf domain.tar.gz /usr/domain
- D. tar -cv domain.tar.gz /usr/domain
正解: C
解説:
Reference:
https://help.ubuntu.com/community/BackupYourSystem/TAR
質問 204
A Linux engineer is troubleshooting a newly added SCSI device for a Linux server that needed more disk space without rebooting. The engineer discovers that the new device is not visible by the Linux kernel in fdisk -l output. Which of the following commands should be used to rescan the entire SCSI bus?
- A. echo "- - -" > /sys/scsi/scsi_host/host0/scan
- B. echo "- - -" > /sys/class/scsi_host/host0/scan
- C. echo ' ' > /sys/class/scsi_host/host0/scan
- D. echo "scan" > /sys/class/scsi_host/host0/scan
正解: B
質問 205
Ann, a junior systems administrator, is required to add a line to the /etc/yum.conffile. However, she receives the following error message when she tries to add the line:
Ann performs some diagnostics to attempt to find the root cause:
Which of the following commands should Ann execute to write content to /etc/yum?
- A. chattr -I /etc/yum.conf
- B. setfacl -m m:rw /etc/yum.conf
- C. chmod 755 /etc/yum.conf
- D. setenforce 0
正解: C
質問 206
A user is reporting unusual slowness when trying to transfer a large file to an NFS server from a workstation.
The administrator runs tracepath and gets the following output:
Which of the following BEST describes the issue and a possible solution?
- A. There is latency on an intermediate router. Increase the path MTU to compensate.
- B. There are dropped packets at an intermediate router. Work with the network team to correct the issue.
- C. There is latency at the storage device. Work with the storage team to correct the issue.
- D. The path MTU is lower than the source MTU. Reduce the source MTU setting.
正解: D
質問 207
A systems administrator wants to know the current status of a series of dd jobs that were started in the background three hours ago.
Which of the following commands will achieve this task?
- A. sudo killall -HUP dd
- B. sudo killall dd
- C. sudo killall -TERM dd
- D. sudo killall -USR1 dd
正解: D
解説:
Reference:
https://askubuntu.com/questions/215505/how-do-you-monitor-the-progress-of-dd
質問 208
A Linux administrator is adding a static IP address to a network interface on a Linux system. The administrator modifies the ifcfg- eth0 configuration file with the following settings:
After the administrator restarts the Linux server, the system is not connected to the network. Which of the following configuration settings needs to be changed?
- A. Set BOOTPROTO to BOOTP and USERCTL to yes.
- B. Set NETMASK to 255.255.0.0 and ONBOOT to yes.
- C. Set BOOTPROTO to NONE and ONBOOT to yes.
- D. Set USERCTL to yes and ONBOOT to no.
正解: B
質問 209
A junior Linux administrator needs to ensure a service will start on system boot. Which of the following commands should be used to accomplish this task?
- A. chkconfig <service> on
- B. crontab install <service>
- C. service <service> enable
- D. systemctl <service> bootup
正解: A
解説:
Reference:
https://geekflare.com/how-to-auto-start-services-on-boot-in-linux/
質問 210
A user issues the following command:
ls -l /var/log | egrep -e '^d[rwx]{3}.*[rw-]{3}.*'
The list of files in the system is shown below:
Which of the following results matches the command issued?
- A. drwxr-xr-x 2 root root 4096 Apr 24 08:36 apt
drwxr-xr-x 2 root root 4096 Apr 9 14:25 dist-upgrade
drwxr-x--- 2 root adm 4096 Apr 25 14:41 unattended-upgrades - B. drwxr-xr-x 2 root root 4096 Apr 24 08:36 apt
drwxr-xr-x 2 root root 4096 Apr 9 14:25 dist-upgrade
drwxr-x--- 2 root adm 4096 Apr 25 15:41 attended-upgrades - C. -rw-r--r-- 1 root root 2877 Apr 24 14:14 alternatives.log
-rw-r--r-- 1 syslog adm 246139 Jun 12 15:21 cloud-init.log
-rw-r--r-- 1 root root 8872 Jun 12 15:21 cloud-init-output.log - D. drwxr-x--- 2 root adm 4096 Apr 25 14:41 unattended-upgrades
drwxr-x--- 2 root adm 4096 Apr 25 15:41 attended-upgrades
正解: D
解説:
https://regexr.com
if the regular expression is as follow: ls -l /var/log | egrep -e '^d[rwx]{3}.*[rw-]{3}.*'
質問 211
An administrator reviews the following configuration file provided by a DevOps engineer:
Which of the following would the application parsing this file MOST likely have to support?
- A. YAML
- B. SOAP
- C. JSON
- D. AJAX
正解: C
質問 212
An administrator needs to set the time of a VM that has no network connectivity to an NTP server. The VM's host, however, is synchronized with NTP.
Which of the following allows the administrator to synchronize the time of the VM with the host?
- A. ntpdate
- B. hwclock
- C. time
- D. date
正解: B
質問 213
A Linux administrator is helping the security team troubleshoot an SELinux policy violation incident. Which of
the following would be the BEST utility command to display SELinux violation and AVC denial messages?
- A. sealert -a /var/log/audit/audit.log
- B. aureport | grep AVC
- C. cat /var/log/messages | grep selinux
- D. journalctl | grep sealert
正解: A
質問 214
A Linux administrator is testing a new web application on a local laptop and consistently shows the following
403 errors in the laptop's logs:
The web server starts properly, but an error is generated in the audit log. Which of the following settings should be enabled to prevent this audit message?
- A. httpd_enable_homedirs = 1
- B. httpd_can_network_connect = 1
- C. httpd_enable_cgi = 1
- D. httpd_enable_scripting = 1
正解: B
質問 215
A Linux administrator has installed a web application firewall in front of a web server running on HTTP port 8080 and successfully started the HTTP server. However, after opening the application URL in an Internet browser, the administrator discovered that the application does not work. The administrator performed the following diagnostic steps:
Output of sysctl -a command:
Output of iptables -L command:
Output of netstat -nltop | grep "8080":
Which of the following is the NEXT step the administrator should perform to permanently fix the issue at the kernel level?
- A. Add iptables rule iptables -A INPUT -m state --state NEW -p tcp --dport 8080 -j then
restart httpd daemon - B. Edit /etc/sysctl.conf file and add net.ipv4.ip_forward = 1 then run sysctl -p /etc/
sysctl.conf to enable the change - C. sysctl -w net.ipv4.ip_forward=1 then run sysctl -w /etc/sysctl.conf to enable the
change - D. Add iptables rule iptables -A FORWARD-m state --state NEW -p tcp --dport 8080 -j
ACCEPT then restart httpd daemon
正解: D
質問 216
A Linux storage administrator wants to create a logical volume group. Which of the following commands is required to start the process?
- A. mkfs.xfs
- B. lvcreate
- C. vgcreate
- D. pvcreate
正解: C
質問 217
Which of the following BEST describes the purpose of the X11 system?
- A. X11 provides graphical display capabilities
- B. X11 provides telephony capabilities.
- C. X11 provides networking capabilities
- D. X11 provides command line capabilities
正解: A
解説:
Explanation/Reference: https://en.wikipedia.org/wiki/X_Window_System
質問 218
A Linux administrator tries to ping a hostname in a network but receives the message: hostname not found. The administrator is sure the name exists on the network and wants to verify if the DNS server is correctly configured on the client. Which of the following files should the administrator use to verify this information?
- A. /etc/nsswitch.conf
- B. /etc/resolv.conf
- C. /etc/network
- D. /etc/named.conf
正解: B
解説:
Explanation/Reference: https://www.hostgator.com/help/article/error-your-hostname-could-not-be-resolved-to-an-ip-address
質問 219
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