After connecting to a remote host via SSH, an administrator attempts to run an application but receives the following error:[user@workstation ~]$ ssh admin@srv1Last login: Tue Mar 29 18:03:34 2022[admin@srvl ~] $ /usr/local/bin/config_managerError: cannot open display:[admin@srv1 ~] $Which of the following should the administrator do to resolve this error?

Disconnect from the SSH session and reconnect using the ssh -x command.

Add Options X11 to the /home/admin/.ssh/authorized_keys file.

Open port 6000 on the workstation and restart the firewalld service.

Enable X11 forwarding in /etc/ssh/ssh_config and restart the server.

A Linux engineer needs to block an incoming connection from the IP address 2.2.2.2 to a secure shell server and ensure the originating IP address receives a response that a firewall is blocking the connection. Which of the following commands can be used to accomplish this task?

iptables -A INPUT -p tcp -- dport ssh -s 2.2.2.2 -j REJECT

iptables -A INPUT -p tcp -- dport ssh -s 2.2.2.2 -j DROP

iptables -A INPUT -p tcp -- dport ssh -s 2.2.2.2 -j RETURN

iptables -A INPUT -p tcp -- dport ssh -s 2.2.2.2 -j REJECT

iptables -A INPUT -p tcp -- dport ssh -s 2.2.2.2 -j QUEUE

A Linux administrator provisioned a new web server with custom administrative permissions for certain users. The administrator receives a report that user1 is unable to restart the Apache web service on this server. The administrator reviews the following output:[ root@server ] # id user1UID=1011 (user1) gid=1011 (USER1) groups=1011 (user1), 101 (www-data), 1120 (webadmin)[ root@server ] # cat /etc/sudoers.d/custom.confuser1 ALL=/usr/sbin/systemctl start httpd, /usr/sbin/systemctl stop httpdwebadmin ALL=NOPASSWD: /etc/init.d.httpd restart, /sbin/service httpd restart, /usr/sbin/apache2ctl restart#%wheel ALL=(ALL) NOPASSWD: ALLWhich of the following would most likely resolve the issue while maintaining a least privilege security model?

Webadmin should be listed as a group in the custom. conf file.

User1 should be added to the wheel group to manage the service.

User1 should have 'NOPASSWD:' after the 'ALL=' in the custom. conf.

The wheel line in the custom. conf file should be uncommented.

Webadmin should be listed as a group in the custom. conf file.

A Linux system is having issues. Given the following outputs:# dig @192.168.2.2 mycomptiahost; << >> DiG 9.9.4-RedHat-9.9.4-74.el7_6.1 << >> @192.168.2.2 mycomptiahost; (1 server found);; global options: +cmd;; connection timed out; no servers could be reached# nc -v 192.168.2.2 53Ncat: Version 7.70 ( https://nmap.org/ncat )Ncat: Connection timed out.# ping 192.168.2.2PING 192.168.2.2 (192.168.2.2) 56(84) bytes of data.64 bytes from 192.168.2.2: icmp_seq=1 ttl=117 time=4.94 ms64 bytes from 192.168.2.2: icmp_seq=2 ttl=117 time=10.5 msWhich of the following best describes this issue?

The DNS service is currently not available or the corresponding port is blocked.

The name mycomptiahost does not exist in the DNS.

The Linux engineer is using the wrong DNS port.

The DNS service is currently not available or the corresponding port is blocked.

Users are experiencing high latency when accessing a web application served by a Linux machine. A systems administrator checks the network interface counters and sees the following: Which of the following is the most probable cause of the observed latency?

A connection problem exists on the network interface.

The network interface is disconnected.

A connection problem exists on the network interface.

No IP address is assigned to the interface.

While troubleshooting server issues, a Linux systems administrator obtains the following output:[rootGhost ~]# total free -m used free shared buf f/cache availableMem: 3736 3598 88 2 48 29Swap: 2047 1824 223Which of the following best describes the state of the system?

The system has enough free memory space.

The system has consumed the system memory and swap space.

The system has enough free memory space.

The system has allocated enough buffer space.

An administrator is running a web server in a container named web, but none of the error output is not showing. Which of the following should the administrator use to generate the errors on the container?

docker run ---name WEB ---volume/dev/stdout:/var/log/nginx/error.log

A technician just fixed a few issues in some code and is ready to deploy the code into production. Which of the following steps should the technician take next?

Create a git pull request to merge into main.

Create a new branch using git checkout.

Perform a git clone to pull main down.

Create a git pull request to merge into main.

Perform a git pull to update the local copy of the code.

A systems administrator is configuring a Linux system so the network traffic from the internal network 172.17.0.0/16 going out through the eth0 interface would appear as if it was sent directly from this interface. Which of the following commands will accomplish this task?

iptables -A POSTROUTING -s 172.17.0.0/16 -o eth0 -j MASQUERADE

firewalld -A OUTPUT -s 172.17.0.0/16 -o eth0 -j DIRECT

nmcli masq-traffic eth0 -s 172.17.0.0/16 -j MASQUERADE

ifconfig -- nat eth0 -s 172.17.0.0/16 -j DIRECT

A user is unable to log on to a Linux workstation. The systems administrator executes the following command:cat /etc/shadow | grep user1The command results in the following output:user1 :! $6$QERgAsdvojadv4asdvaarC/9dj34GdafGVaregmkdsfa:18875:0:99999:7 :::Which of the following should the systems administrator execute to fix the issue?

chown -R userl:user1 /home/user1

sed -i '/ ::: / :: /g' /etc/shadow

A Linux engineer finds multiple failed login entries in the security log file for application users. The Linux engineer performs a security audit and discovers a security issue. Given the following:# grep -iE '*www*|db' /etc/passwdwww-data:x:502:502:www-data:/var/www:/bin/bashdb:x: 505:505:db: /opt/db:/bin/bashWhich of the following commands would resolve the security issue?

chsh -s /bin/false www-data && chsh -s /bin/false db

usermod -d /srv/www-data www-data && usermod -d /var/lib/db db

passwd -u www-data && passwd -u db

renice -n 1002 -u 502 && renice -n 1005 -u 505

chsh -s /bin/false www-data && chsh -s /bin/false db

A Linux administrator has defined a systemd script docker-repository.mount to mount a volume for use by the Docker service. The administrator wants to ensure that Docker service does not start until the volume is mounted. Which of the following configurations needs to be added to the Docker service definition to best accomplish this task?

Requires=docker-repository.mount

RequiresMountsFor=docker-repository.mount

Which of the following will prevent non-root SSH access to a Linux server?

Creating the /etc/nologin.allow file containing only a single line root

Creating the /etc/nologin/login.deny file containing a single line +all

Ensuring that /etc/pam.d/sshd includes account sufficient pam_nologin.so

A systems administrator is working on a security report from the Linux servers. Which of the following commands can the administrator use to display all the firewall rules applied to the Linux servers? (Select two).

firewall---cmd ------1ist---a11

An administrator needs to make an application change via a script that must be run only in console mode. Which of the following best represents the sequence the administrator should execute to accomplish this task?

systemct1 isolate multi-user.target sh script.sh systemct1 isolate graphical.target

systemct1 isolate graphical.target sh script.sh systemct1 isolate multi-user.target

sh script.sh systemct1 isolate multi-user.target systemct1 isolate graphical.target

systemct1 isolate multi-user.target systemct1 isolate graphical.target sh script.sh

An administrator created an initial Git repository and uploaded the first files. The administrator sees the following when listing the repository: The administrator notices the file . DS STORE should not be included and deletes it from the online repository. Which of the following should the administrator run from the root of the local repository before the next commit to ensure the file is not uploaded again in future commits?

git fetch && git checkout .DS STORE

rm -f .DS STORE && git rebase origin main

Users are unable to create new files on the company's FTP server, and an administrator is troubleshooting the issue. The administrator runs the following commands: Which of the following is the cause of the issue based on the output above?

The inodes is at full capacity and would affect file creation for users.

The users do not have the correct permissions to create files on the FTP server.

The ftpusers filesystem does not have enough space.

The inodes is at full capacity and would affect file creation for users.

ftpusers is mounted as read only.

An administrator added the port 2222 for the SSH server on myhost and restarted the SSH server. The administrator noticed issues during the startup of the service. Given the following outputs: Which of the following commands will fix the issue?

semanage port -a -t ssh_port_t -p tcp 2222

chcon system_u:object_r:ssh_home_t /etc/ssh/*

iptables -A INPUT -p tcp -- dport 2222 -j ACCEPT

firewall-cmd -- zone=public -- add-port=2222/tcp

A systems administrator detected corruption in the /data filesystem. Given the following output: Which of the following commands can the administrator use to best address this issue?

umount /data xfs repair /dev/ sdcl mount /data

umount /data mkfs . xfs /dev/sclcl mount /data

umount /data xfs repair /dev/ sdcl mount /data

umount /data fsck /dev/ sdcl mount / data

umount /data pvs /dev/sdcl mount /data

A Linux administrator is configuring a two-node cluster and needs to be able to connect the nodes to each other using SSH keys from the root account. Which of the following commands will accomplish this task?

[root@nodea ssh---copy-id ---i .ssh/id rsa root@nodeb

[root@nodea ssh ---i ~/ . ssh/d rsa root@nodeb

[root@nodea scp -i . ssh/id rsa root@nodeb

[root@nodea ssh---copy-id ---i .ssh/id rsa root@nodeb

[root@nodea # ssh add -c ~/ . ssh/id rsa root@nodeb

[root@nodea # ssh add -c ~/. ssh/id rsa root@nodeb

An administrator attempts to connect to a remote server by running the following command:$ nmap 192.168.10.36Starting Nmap 7.60 ( https://nmap.org ) at 2022-03-29 20:20 UTCNmap scan report for www1 (192.168.10.36)Host is up (0.000091s latency).Not shown: 979 closed portsPORT STATE SERVICE21/tcp open ftp22/tcp filtered ssh631/tcp open ippNmap done: 1 IP address (1 host up) scanned in 0.06 secondsWhich of the following can be said about the remote server?

A firewall is blocking access to the SSH server.

The SSH server is not running on the remote server.

The remote SSH server is using SSH protocol version 1.

The SSH host key on the remote server has expired.

A systems administrator notices the process list on a mission-critical server has a large number of processes that are in state 'Z' and marked as 'defunct.' Which of the following should the administrator do in an attempt to safely remove these entries from the process list?

Kill the parent PID of the processes.

Users are reporting that writes on a system configured with SSD drives have been taking longer than expected, but reads do not seem to be affected. A Linux systems administrator is investigating this issue and working on a solution. Which of the following should the administrator do to help solve the issue?

Run the corresponding command to trim the SSD drives.

Use fsck on the filesystem hosted on the SSD drives.

Migrate to high-density SSD drives for increased performance.

Reduce the amount of files on the SSD drives.

A file called testfile has both uppercase and lowercase letters:$ cat testfileABCDEfgHIJKLmnoPQabcdefgHijklLMNopqA Linux administrator is tasked with converting testfile into all uppercase and writing it to a new file with the name uppercase. Which of the following commands will achieve this task?

tr '[a-z]' '[A-Z]' < testfile > uppercase

tr '(A-Z}' '{a-z}' < testfile > uppercase

echo testfile | tr '[Z-A]' '[z-a]' < testfile > uppercase

cat testfile | tr '{z-a)' '{Z-A}' < testfile > uppercase

tr '[a-z]' '[A-Z]' < testfile > uppercase

A Linux administrator is troubleshooting a systemd mount unit file that is not working correctly. The file contains:[root@system] # cat mydocs.mount[Unit]Description=Mount point for My Documents drive[Mount]What=/dev/drv/disk/by-uuid/94afc9b2-ac34-ccff-88ae-297ab3c7ff34Where=/home/user1/My DocumentsOptions=defaultsType=xfs[Install]WantedBy=multi-user.targetThe administrator verifies the drive UUID correct, and user1 confirms the drive should be mounted as My Documents in the home directory. Which of the following can the administrator do to fix the issues with mounting the drive? (Select two).

Rename the mount file to home-user1-My\x20Documents.mount.

Change the Where entry to Where=/home/user1/My\x20Documents.

Rename the mount file to home-user1-My\x20Documents.mount.

Rename the mount file to home-user1-my-documents.mount.

Change the What entry to /dev/drv/disk/by-uuid/94afc9b2\-ac34\-ccff\-88ae\-297ab3c7ff34.

Change the Where entry to Where=/home/user1/my\ documents.

Change the Where entry to Where=/home/user1/My\x20Documents.

Add quotes to the What and Where entries, such as What='/dev/drv/disk/by-uuid/94afc9b2-ac34-ccff-88ae-297ab3c7ff34' and Where='/home/user1/My Documents'.

A Linux user is trying to execute commands with sudo but is receiving the following error:$ sudo visudo>>> /etc/sudoers: syntax error near line 28 <<<sudo: parse error in /etc/sudoers near line 28sudo: no valid sudoers sources found, quittingThe following output is provided:# grep root /etc/shadowroot :* LOCK *: 14600 ::::::Which of the following actions will resolve this issue?

Boot the system in single user mode and comment out line 28 from /etc/sudoers.

Log in directly using the root account and comment out line 28 from /etc/sudoers.

Boot the system in single user mode and comment out line 28 from /etc/sudoers.

Comment out line 28 from /etc/sudoers and try to use sudo again.

Log in to the system using the other regular user, switch to root, and comment out line 28 from /etc/sudoers.

CompTIA XK0-005 Practice Test 7 - Free Online Exam Prep & Questions

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A systems administrator created a new directory with specific permissions. Given the following output:

# file: comptia

# owner: root

# group: root

user: : rwx

group :: r-x

other: :---

default:user :: rwx

default:group :: r-x

default:group:wheel: rwx

default:mask :: rwx

default:other ::-

Which of the following permissions are enforced on /comptia?

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XK0-005: CompTIA Linux+

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CompTIA XK0-005 Practice Test 7

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