Practice Free XK0-005 Exam Online Questions
Which of the following would significantly help to reduce data loss if more than one drive fails at the same time?
- A . Server clustering
- B . Load balancing
- C . RAID
- D . VDI
C
Explanation:
RAID stands for Redundant Array of Independent Disks, which is a technology that combines multiple physical disks into a logical unit that provides improved performance, reliability, or both. RAID can significantly help to reduce data loss if more than one drive fails at the same time, depending on the RAID level used. For example, RAID 1 (mirroring) duplicates the data on two or more disks, so that if one disk fails, the data can be recovered from another disk. RAID 5 (striping with parity) distributes the data and parity information across three or more disks, so that if one disk fails, the data can be reconstructed from the remaining disks. RAID 6 (striping with double parity) extends RAID 5 by adding another parity block, so that if two disks fail, the data can still be recovered from the remaining disks.
Reference: [What is RAID?]
Rugged appliances are small appliances with ruggedized hardware and like Quantum Spark appliance they use which operating system?
- A . Centos Linux
- B . Gaia embedded
- C . Gaia
- D . Red Hat Enterprise Linux version 5
B
Explanation:
Rugged appliances are small appliances with ruggedized hardware that use Gaia embedded as their operating system. Gaia embedded is a version of Gaia that is optimized for embedded devices such as Rugged appliances and Quantum Spark appliances. Gaia embedded supports features such as VPN, firewall, identity awareness, application control, URL filtering, and anti-bot. Gaia embedded does not use Centos Linux, Gaia, or Red Hat Enterprise Linux version 5 as their operating system.
Reference: Check Point Rugged Appliance Datasheet, page 1.
Which of the following technologies provides load balancing, encryption, and observability in containerized environments?
- A . Virtual private network
- B . Sidecar pod
- C . Overlay network
- D . Service mesh
D
Explanation:
"A service mesh controls the delivery of service requests in an application. Common features provided by a service mesh include service discovery, load balancing, encryption and failure recovery."
The technology that provides load balancing, encryption, and observability in containerized environments is service mesh. A service mesh is a dedicated infrastructure layer that manages the communication and security between microservices in a distributed system. A service mesh consists of two components: a data plane and a control plane. The data plane is composed of proxies that are deployed alongside the microservices as sidecar pods. The proxies handle the network traffic between the microservices and provide features such as load balancing, encryption, authentication, authorization, routing, and observability. The control plane is responsible for configuring and managing the data plane and providing a unified interface for the administrators and developers. A service mesh can help improve the performance, reliability, and security of containerized applications and simplify the development and deployment process. A service mesh is the technology that provides load balancing, encryption, and observability in containerized environments. This is the correct answer to the question. The other options are incorrect because they either do not provide all the features of a service mesh (virtual private network or overlay network) or are not a technology but a component of a service mesh (sidecar pod).
Reference: CompTIA Linux+ (XK0-005) Certification Study Guide, Chapter 19: Managing Cloud and Virtualization Technologies, page 574.
https://www.techtarget.com/searchitoperations/definition/service-mesh
A systems administrator needs to verify whether the built container has the app.go file in its root directory.
Which of the following can the administrator use to verify the root directory has this file?
- A . docker image inspect
- B . docker container inspect
- C . docker exec <container_name> ls
- D . docker ps <container_name>
C
Explanation:
The docker exec <container_name> ls command can be used to verify whether the built container has the app.go file in its root directory. This command will run the ls command inside the specified container and list the files and directories in its root directory. If the app.go file is present, it will be displayed in the output. The docker image inspect command will display information about an image, not a container, and it will not list the files inside the image. The docker container inspect command will display information about a container, not its files. The docker ps <container_name> command is invalid, as ps does not accept a container name as an argument.
Reference: CompTIA Linux+ (XK0-005) Certification Study Guide, Chapter 16: Virtualization and Cloud Technologies, page 499.
The applications team is reporting issues when trying to access the web service hosted in a Linux system.
The Linux systems administrator is reviewing the following outputs:
Output 1:
* httpd.service = The Apache HTTPD Server
Loaded: loaded (/usr/lib/systemd/system/httpd.service; disabled; vendor preset: disabled)
Active: inactive (dead)
Docs: man:httpd(8) man:apachectl(8)
Output 2:
16:51:16 up 28 min, 1 user, load average: 0.00, 0.00, 0.07
Which of the following statements best describe the root cause? (Select two).
- A . The httpd service is currently started.
- B . The httpd service is enabled to auto start at boot time, but it failed to start.
- C . The httpd service was manually stopped.
- D . The httpd service is not enabled to auto start at boot time.
- E . The httpd service runs without problems.
- F . The httpd service did not start during the last server reboot.
C,D
Explanation:
The httpd.service is the Apache HTTPD Server, which is a web service that runs on Linux systems. The output 1 shows that the httpd.service is inactive (dead), which means that it is not running. The output 1 also shows that the httpd.service is disabled, which means that it is not enabled to auto start at boot time. Therefore, the statements C and D best describe the root cause of the issue. The statements A, B, E, and F are incorrect because they do not match the output 1.
Reference: [How to Manage Systemd Services on a Linux System]
A systems administrator wants to list all local accounts in which the UID is greater than 500.
Which of the following commands will give the correct output?
- A . find /etc/passwd ―size +500
- B . cut ―d: fl / etc/ passwd > 500
- C . awk -F: ‘$3 > 500 {print $1}’ /etc/passwd
- D . sed ‘/UID/’ /etc/passwd < 500
C
Explanation:
The correct command to list all local accounts in which the UID is greater than 500 is:
awk -F: ‘$3 > 500 {print $1}’ /etc/passwd
This command uses awk to process the /etc/passwd file, which contains information about the local users on the system. The -F: option specifies that the fields are separated by colons. The $3 refers to the third field, which is the UID. The condition $3 > 500 filters out the users whose UID is greater than 500. The action {print $1} prints the first field, which is the username. The other commands are incorrect because:
find /etc/passwd ―size +500 will search for files that are larger than 500 blocks in size, not users with UID greater than 500.
cut ―d: fl / etc/ passwd > 500 will cut the first field of the /etc/passwd file using colon as the delimiter, but it will not filter by UID or print only the usernames. The > 500 part will redirect the output to a file named 500, not compare with the UID.
sed ‘/UID/’ /etc/passwd < 500 will use sed to edit the /etc/passwd file and replace any line that contains UID with 500, not list the users with UID greater than 500. The < 500 part will redirect the input from a file named 500, not compare with the UID.
Reference: Linux List All Users In The System Command – nixCraft, section “List all users in Linux using /etc/passwd file”.
Unix script getting users with UID bigger than 500 – Stack Overflow, section “Using awk”.
Users report that they cannot access some files located in the /opt/finapp directory after a power outage caused an unexpected server restart.
A Linux administrator examines the following filesystem details and system logs:
# mount | grep finapp
/dev/mapper/rhel-opt_finapp on /opt/finapp type xfs
(rw,relatime,seclabel,attr2,inode64,logbufs=8,logbsize=32k,noquota)
# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 931.5G 0 disk
├─sda1 8:1 0 1G 0 part /boot
└─sda2 8:2 0 930.5G 0 part
├─rhel-root 253:0 0 30.5G 0 lvm /
└─rhel-opt_finapp 253:1 0 900G 0 lvm /opt/finapp
# grep opt_finapp /var/log/messages
XFS (opt_finapp): Corruption detected in inode 3645, extent tree
Which of the following commands should the administrator run in an attempt to fix the filesystem?
- A . fdisk /dev/mapper/rhel-opt_finapp
- B . xfs_repair /dev/mapper/rhel-opt_finapp
- C . lvcreate -L900G -n opt_finapp rhel
- D . fsck.ext4 /dev/mapper/rhel-opt_finapp
B
Explanation:
For repairing XFS filesystems, the appropriate command is xfs_repair. Since the /opt/finapp directory resides on an XFS filesystem (indicated in the mount output), xfs_repair is suitable for diagnosing and fixing corruption in XFS inodes and extent trees. Using fdisk or fsck.ext4 is not appropriate for XFS filesystems, as these commands are intended for partitioning and ext4 filesystems, respectively.
Reference: CompTIA Linux+ Study Guide.
A network administrator issues the dig ww.comptia.org command and receives an NXDOMAIN response.
Which of the following files should the administrator check first?
- A . /etc/resolv.conf
- B . /etc/hosts
- C . /etc/sysconfig/network-scripts
- D . /etc/nsswitch.conf
A
Explanation:
The dig command uses the DNS servers listed in the /etc/resolv.conf file to resolve domain names. If the dig command returns an NXDOMAIN response, it means the domain does not exist according to the DNS servers used. Therefore, the administrator should check the /etc/resolv.conf file first34.
Reference:3(https://www.linuxquestions.org/questions/linux-newbie-8/help-me-dig-status-nxdomain-4175684441/)4(https://serverfault.com/questions/729025/what-are-all-the-flags-in-a-dig-response)
A junior developer is unable to access an application server and receives the following output:
The systems administrator investigates the issue and receives the following output:
Which of the following commands will help unlock the account?
- A . Pam_tally2 –user=dev2 ―-quiet
- B . pam_ tally2 –user=dev2
- C . pam_tally2 -Cuser+dev2 ―-quiet
- D . pam_tally2 –user=dev2 ―-reset
D
Explanation:
To unlock an account that has been locked due to login failures, the administrator can use the command pam_tally2 –user=dev2 –reset (D). This will reset the failure counter for the user “dev2” and allow the user to log in again. The other commands will not unlock the account, but either display or increase the failure count.
Reference: [CompTIA Linux+ Study Guide], Chapter 4: Managing Users and Groups, Section: Locking Accounts with pam_tally2
[How to Lock and Unlock User Account in Linux]
A junior administrator is setting up a new Linux server that is intended to be used as a router at a remote site.
Which of the following parameters will accomplish this goal?
A)
B)
C)
D)
- A . Option A
- B . Option B
- C . Option C
- D . Option D
C
Explanation:
The parameter net.ipv4.ip_forward=1 will accomplish the goal of setting up a new Linux server as a router. This parameter enables the IP forwarding feature, which allows the server to forward packets between different network interfaces. This is necessary for a router to route traffic between different networks. The parameter can be set in the /etc/sysctl.conf file or by using the sysctl command. This is the correct parameter to use to accomplish the goal. The other options are incorrect because they either do not exist (net.ipv4.ip_forwarding or net.ipv4.ip_route) or do not enable IP forwarding (net.ipv4.ip_forward=0).
Reference: CompTIA Linux+ (XK0-005) Certification Study Guide, Chapter 12: Managing Network Connections, page 382.