EX200 Operate running systems — All Questions With Answers

Question 1hardmultiple choice

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A system administrator needs to ensure that a specific process continues to run even if it crashes. The process is started by a systemd service unit. Which approach ensures the process is automatically restarted by systemd, with a delay of 30 seconds after each crash, and does not count restarts towards the failure limit?

Question 2mediummulti select

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Which TWO statements about systemd journal and rsyslog are correct?

Question 3easymultiple choice

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Refer to the exhibit. A security analyst reviews the journal output for sshd.service. Which of the following best describes the observed pattern of events?

Exhibit

Refer to the exhibit.

# systemctl status sshd
● sshd.service - OpenSSH server daemon
   Loaded: loaded (/usr/lib/systemd/system/sshd.service; enabled; vendor preset: enabled)
   Active: active (running) since Mon 2025-02-17 10:30:45 EST; 2h 15min ago
 Main PID: 1234 (sshd)
   Status: "Server listening on 0.0.0.0 port 22."
   CGroup: /system.slice/sshd.service
           └─1234 /usr/sbin/sshd -D

Feb 17 12:45:01 localhost sshd[1234]: Did not receive identification string from 192.168.1.100 port 54321
Feb 17 12:45:02 localhost sshd[1234]: Connection closed by 192.168.1.100 port 54321 [preauth]
Feb 17 12:46:10 localhost sshd[1234]: Failed password for root from 192.168.1.100 port 54322 ssh2
Feb 17 12:46:10 localhost sshd[1234]: Failed password for root from 192.168.1.100 port 54322 ssh2
Feb 17 12:46:11 localhost sshd[1234]: Failed password for root from 192.168.1.100 port 54322 ssh2
Feb 17 12:46:11 localhost sshd[1234]: Connection closed by 192.168.1.100 port 54322 [preauth]
Feb 17 12:47:05 localhost sshd[1234]: Accepted password for root from 192.168.1.100 port 54323 ssh2
Feb 17 12:47:05 localhost sshd[1234]: pam_unix(sshd:session): session opened for user root by (uid=0)

Question 4mediumdrag order

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Arrange the steps to configure a static IPv4 route in Red Hat Enterprise Linux.

Drag steps to the numbered slots on the right, or tap a step then tap a slot.

Steps

Order

1Step 1

2Step 2

3Step 3

4Step 4

5Step 5

Question 5mediumdrag order

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Order the steps to configure a new user 'jdoe' with UID 2000, home directory /home/jdoe, and secondary group 'staff'.

Drag steps to the numbered slots on the right, or tap a step then tap a slot.

Steps

Order

1Step 1

2Step 2

3Step 3

4Step 4

5Step 5

Question 6mediummatching

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Match each file system type to its description.

Drag a concept onto its matching description — or click a concept then click the description.

Concepts

Matches

Default file system for RHEL 8/9 with journaling and support for large files

High-performance 64-bit journaling file system, default for /boot in RHEL 7

Copy-on-write file system with snapshots and compression (available in RHEL 8/9)

Used for virtual memory, typically as a partition or file

Question 7mediummatching

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Match each user/group management command to its function.

Drag a concept onto its matching description — or click a concept then click the description.

Concepts

Matches

Create a new user account

Modify an existing user account

Create a new group

Set or change a user's password

Question 8easymultiple choice

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A critical service must restart automatically after a crash. Which systemd directive should be added to the [Service] section of the service unit file?

Question 9easymultiple choice

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Which command checks if a specific systemd service is currently running?

Question 10hardmultiple choice

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An ext4 filesystem on a logical volume has been extended with lvextend, but df -h still shows the old size. Which command must be run to make the filesystem aware of the new size?

Question 11easymultiple choice

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A security policy requires user passwords to expire 60 days after last change. Which command sets this for user 'jdoe'?

Question 12easymultiple choice

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Which systemctl command configures a service to start automatically at boot without starting it now?

Question 13hardmultiple choice

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After a system crash, an administrator needs to review logs from the previous boot. Which command shows only logs from the boot before the current one?

Question 14mediummultiple choice

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An administrator needs to combine two physical network interfaces into a single logical interface for redundancy. Which RHEL tool is recommended to configure this in RHEL 8/9?

Question 15easymultiple choice

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To mount an ext4 filesystem with the noatime option and remount read-only on errors, which file should be edited?

Question 16hardmultiple choice

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After restoring files from backup, an SELinux context of a directory is not correct. Which command will restore the file contexts to the system defaults?

Question 17mediummulti select

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Which two commands can be used to view systemd journal entries for the sshd service?

Question 18mediummulti select

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Which three network configuration methods are valid in RHEL 8/9?

Question 19hardmulti select

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Which three commands can be used to display overall memory usage information?

Question 20mediummultiple choice

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Refer to the exhibit. What is the most likely cause of this failure?

Exhibit

[root@server ~]# systemctl status sshd
● sshd.service - OpenSSH server daemon
   Loaded: loaded (/usr/lib/systemd/system/sshd.service; enabled; vendor preset: enabled)
   Active: failed (Result: exit-code) since Mon 2025-03-10 14:22:34 EDT; 5min ago
  Process: 1234 ExecStart=/usr/sbin/sshd -D $OPTIONS (code=exited, status=255)
 Main PID: 1234 (code=exited, status=255)
   Status: "Failed to start sshd"
   CGroup: /system.slice/sshd.service
           └─1234 /usr/sbin/sshd -D

Jan 10 14:22:34 server sshd[1234]: fatal: Cannot bind any address.
Jan 10 14:22:34 server sshd[1234]: fatal: Cannot bind any address.

Question 21hardmultiple choice

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Refer to the exhibit. Which command would free up the most space immediately?

Exhibit

[root@server ~]# df -h /var
Filesystem      Size  Used Avail Use% Mounted on
/dev/mapper/rootvg-var  20G   19G  1G   95% /var
[root@server ~]# du -sh /var/log
5.2G    /var/log

Question 22mediummultiple choice

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Refer to the exhibit. The web server fails to start. What is the most likely cause?

Exhibit

[root@server ~]# getenforce
Enforcing
[root@server ~]# ls -Z /var/www/html/index.html
unconfined_u:object_r:httpd_sys_content_t:s0 /var/www/html/index.html
[root@server ~]# systemctl status httpd
● httpd.service - The Apache HTTP Server
   Loaded: loaded (/usr/lib/systemd/system/httpd.service; disabled; vendor preset: disabled)
   Active: inactive (dead)

Question 23mediummultiple choice

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A system administrator receives reports that a web server service (httpd) fails to start after a reboot. The administrator checks the service status and sees it is disabled. Which of the following is the most appropriate command to ensure the service starts automatically on future reboots?

Question 24hardmultiple choice

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Based on the exhibit, what is the most likely cause of the failure?

Exhibit

● sshd.service - OpenSSH server daemon
   Loaded: loaded (/usr/lib/systemd/system/sshd.service; enabled; vendor preset: enabled)
   Active: failed (Result: exit-code) since Mon 2024-03-11 09:23:45 EDT; 5min ago
  Process: 1234 ExecStart=/usr/sbin/sshd -D $OPTIONS (code=exited, status=255)
 Main PID: 1234 (code=exited, status=255)
   Status: "Failed to start sshd: Address already in use"

Question 25easymulti select

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Which TWO commands can be used to view recent systemd journal logs for the current boot?

Question 26mediummultiple choice

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A server running Red Hat Enterprise Linux 9 experiences high system load (load average 15 on a 4-core system) and slow response times. The administrator runs 'top' and sees that the 'kworker' processes are consuming significant CPU time. Further investigation reveals that the system is performing heavy I/O operations on the root filesystem, which is formatted as XFS. The administrator wants to reduce the impact of filesystem maintenance tasks on system performance. Which of the following actions should the administrator take?

Question 27hardmultiple choice

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A junior administrator configured a new network interface (ens224) with a static IP address using a configuration file in /etc/sysconfig/network-scripts/ifcfg-ens224. After restarting the network service, the interface comes up but does not get the IP address. The administrator runs 'ip addr show ens224' and sees no IP address assigned. The interface is listed as DOWN. The administrator then runs 'ifup ens224' manually, which succeeds, and the IP address appears. What is the most likely cause?

Question 28easymulti select

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A system administrator needs to ensure a service called 'myapp' starts automatically at boot and also start it immediately without affecting the current boot configuration. Which TWO commands should be used?

Question 29mediummultiple choice

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Refer to the exhibit. What is the most likely cause of the httpd service failure?

Exhibit

● httpd.service - The Apache HTTP Server
   Loaded: loaded (/usr/lib/systemd/system/httpd.service; disabled; vendor preset: disabled)
   Active: failed (Result: exit-code) since Mon 2025-03-10 09:23:45 EDT; 5min ago
     Docs: man:httpd.service(8)
   Process: 12345 ExecStart=/usr/sbin/httpd $OPTIONS -k start (code=exited, status=1/FAILURE)
  Main PID: 12345 (code=exited, status=1/FAILURE)
   Status: "Total requests: 0; Current requests/sec: 0; Current traffic: 0 B/sec"
    Tasks: 0 (limit: 23132)
   Memory: 0B
   CGroup: /system.slice/httpd.service

Mar 10 09:23:45 server1 systemd[1]: Starting The Apache HTTP Server...
Mar 10 09:23:45 server1 httpd[12345]: [Mon Mar 10 09:23:45.123456 2025] [core:error] [pid 12345] (13)Permission denied: AH00035: access to /var/www/html/index.html denied (status 403)
Mar 10 09:23:45 server1 httpd[12345]: (13)Permission denied: AH00035: access to /var/www/html/index.html denied
Mar 10 09:23:45 server1 systemd[1]: httpd.service: Child 12345 belongs to httpd.service
Mar 10 09:23:45 server1 systemd[1]: httpd.service: Main process exited, code=exited, status=1/FAILURE
Mar 10 09:23:45 server1 systemd[1]: httpd.service: Failed with result 'exit-code'.

Question 30hardmultiple choice

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A system administrator is troubleshooting a custom service called 'database.service' that fails intermittently. The service is a proprietary database that requires large amounts of memory. The administrator runs systemctl status database and sees 'Active: failed (Result: core-dump)' and the journal shows 'Out of memory: Killed process (database) total-vm:...' The server has 8GB RAM and 2 CPU cores. The service unit file does not contain any memory limits. The application is configured to use up to 4GB. The administrator suspects the systemd service is being killed by the OOM killer. Which action should the administrator take to prevent this issue?

Refer to the exhibit. # systemctl status sshd ● sshd.service - OpenSSH server daemon Loaded: loaded (/usr/lib/systemd/system/sshd.service; enabled; vendor preset: enabled) Active: active (running) since Mon 2025-02-17 10:30:45 EST; 2h 15min ago Main PID: 1234 (sshd) Status: "Server listening on 0.0.0.0 port 22." CGroup: /system.slice/sshd.service └─1234 /usr/sbin/sshd -D Feb 17 12:45:01 localhost sshd[1234]: Did not receive identification string from 192.168.1.100 port 54321 Feb 17 12:45:02 localhost sshd[1234]: Connection closed by 192.168.1.100 port 54321 [preauth] Feb 17 12:46:10 localhost sshd[1234]: Failed password for root from 192.168.1.100 port 54322 ssh2 Feb 17 12:46:10 localhost sshd[1234]: Failed password for root from 192.168.1.100 port 54322 ssh2 Feb 17 12:46:11 localhost sshd[1234]: Failed password for root from 192.168.1.100 port 54322 ssh2 Feb 17 12:46:11 localhost sshd[1234]: Connection closed by 192.168.1.100 port 54322 [preauth] Feb 17 12:47:05 localhost sshd[1234]: Accepted password for root from 192.168.1.100 port 54323 ssh2 Feb 17 12:47:05 localhost sshd[1234]: pam_unix(sshd:session): session opened for user root by (uid=0)

[root@server ~]# systemctl status sshd ● sshd.service - OpenSSH server daemon Loaded: loaded (/usr/lib/systemd/system/sshd.service; enabled; vendor preset: enabled) Active: failed (Result: exit-code) since Mon 2025-03-10 14:22:34 EDT; 5min ago Process: 1234 ExecStart=/usr/sbin/sshd -D $OPTIONS (code=exited, status=255) Main PID: 1234 (code=exited, status=255) Status: "Failed to start sshd" CGroup: /system.slice/sshd.service └─1234 /usr/sbin/sshd -D Jan 10 14:22:34 server sshd[1234]: fatal: Cannot bind any address. Jan 10 14:22:34 server sshd[1234]: fatal: Cannot bind any address.

[root@server ~]# getenforce Enforcing [root@server ~]# ls -Z /var/www/html/index.html unconfined_u:object_r:httpd_sys_content_t:s0 /var/www/html/index.html [root@server ~]# systemctl status httpd ● httpd.service - The Apache HTTP Server Loaded: loaded (/usr/lib/systemd/system/httpd.service; disabled; vendor preset: disabled) Active: inactive (dead)

● sshd.service - OpenSSH server daemon Loaded: loaded (/usr/lib/systemd/system/sshd.service; enabled; vendor preset: enabled) Active: failed (Result: exit-code) since Mon 2024-03-11 09:23:45 EDT; 5min ago Process: 1234 ExecStart=/usr/sbin/sshd -D $OPTIONS (code=exited, status=255) Main PID: 1234 (code=exited, status=255) Status: "Failed to start sshd: Address already in use"

● httpd.service - The Apache HTTP Server Loaded: loaded (/usr/lib/systemd/system/httpd.service; disabled; vendor preset: disabled) Active: failed (Result: exit-code) since Mon 2025-03-10 09:23:45 EDT; 5min ago Docs: man:httpd.service(8) Process: 12345 ExecStart=/usr/sbin/httpd $OPTIONS -k start (code=exited, status=1/FAILURE) Main PID: 12345 (code=exited, status=1/FAILURE) Status: "Total requests: 0; Current requests/sec: 0; Current traffic: 0 B/sec" Tasks: 0 (limit: 23132) Memory: 0B CGroup: /system.slice/httpd.service Mar 10 09:23:45 server1 systemd[1]: Starting The Apache HTTP Server... Mar 10 09:23:45 server1 httpd[12345]: [Mon Mar 10 09:23:45.123456 2025] [core:error] [pid 12345] (13)Permission denied: AH00035: access to /var/www/html/index.html denied (status 403) Mar 10 09:23:45 server1 httpd[12345]: (13)Permission denied: AH00035: access to /var/www/html/index.html denied Mar 10 09:23:45 server1 systemd[1]: httpd.service: Child 12345 belongs to httpd.service Mar 10 09:23:45 server1 systemd[1]: httpd.service: Main process exited, code=exited, status=1/FAILURE Mar 10 09:23:45 server1 systemd[1]: httpd.service: Failed with result 'exit-code'.