EX200 Practice Test 5 — 25 Questions

Question 1

Match each networking term to its definition.

Accepted Answer

IP address: A unique identifier assigned to each device on a network.. The correct matches are: IP address (unique identifier), Subnet mask (network/host division), Default gateway (router to external networks), DNS server (name resolution). Common confusions include swapping definitions between IP address and subnet mask, or between default gateway and DNS server.

Answer

IP address: A 32-bit number used to divide an IP address into network and host portions.

Answer

Default gateway: A server that resolves domain names to IP addresses.

Question 2

Arrange the steps to configure a logical volume snapshot named 'snap_lv_data' of logical volume 'lv_data'.

Accepted Answer

Create snapshot using lvcreate -s, Mount snapshot to a directory, Perform operations on snapshot, Unmount snapshot, Remove snapshot. The correct sequence for configuring a logical volume snapshot is to first create the snapshot with lvcreate -s, mount it to access its contents, perform necessary operations (such as backups), unmount the snapshot, and finally remove it to clean up. Common mistakes include mounting or operating on the snapshot before it exists, or removing it prematurely.

Answer

Mount snapshot to a directory, Create snapshot using lvcreate -s, Perform operations on snapshot, Unmount snapshot, Remove snapshot

Answer

Create snapshot using lvcreate -s, Perform operations on snapshot, Mount snapshot to a directory, Unmount snapshot, Remove snapshot

Answer

Create snapshot using lvcreate -s, Mount snapshot to a directory, Remove snapshot, Perform operations on snapshot, Unmount snapshot

Question 3

Match each systemd unit type to its purpose.

Accepted Answer

service: Manages daemon processes. Systemd unit types define system resources: service (daemons), socket (IPC), target (group/synchronization), timer (scheduled activation). Common confusions involve mixing mount with service and target with timer.

Answer

service: Manages file system mount points

Answer

timer: Groups units to define synchronization points

Question 4

Match each firewall zone to its default trust level.

Accepted Answer

drop: No traffic is sent, and incoming packets are dropped without reply.. Correct matches: drop blocks all traffic silently, public allows only basic services, internal allows more services, trusted allows all. Common confusions include mixing drop with trusted or public with internal.

Answer

drop: All network connections are accepted.

Answer

public: Medium to high trust.

Question 5

Put the steps to configure NFS server to export /nfsshare to a specific client in order.

Accepted Answer

Step 1: Create the /nfsshare directory. Step 2: Edit /etc/exports to add the export entry. Step 3: Run exportfs -a to export the directory. Step 4: Start and enable the NFS server service.. NFS export configuration involves creating the directory, editing /etc/exports, exporting, and starting services.

Answer

Step 1: Edit /etc/exports to add the export entry. Step 2: Create the /nfsshare directory. Step 3: Start and enable the NFS server service. Step 4: Run exportfs -a.

Answer

Step 1: Start and enable the NFS server service. Step 2: Create the /nfsshare directory. Step 3: Edit /etc/exports to add the export entry. Step 4: Run exportfs -a.

Answer

Step 1: Create the /nfsshare directory. Step 2: Run exportfs -a. Step 3: Edit /etc/exports to add the export entry. Step 4: Start and enable the NFS server service.

Question 6

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

Accepted Answer

Identify the network interface → Edit the interface configuration file → Add GATEWAY and NETMASK directives → Save and restart the network service. Static routes in RHEL are configured in interface configuration files by specifying GATEWAY and NETMASK, then restarting the network service.

Answer

Restart the network service → Edit the interface configuration file → Add GATEWAY and NETMASK directives → Identify the network interface

Answer

Edit the interface configuration file → Add GATEWAY and NETMASK directives → Restart the network service → Identify the network interface

Answer

Identify the network interface → Restart the network service → Edit the interface configuration file → Add GATEWAY and NETMASK directives

Question 7

Order the steps to create a new LVM logical volume of 5 GiB named 'lv_data' in volume group 'vg_data'.

Accepted Answer

1. pvcreate, 2. vgcreate, 3. lvcreate, 4. mkfs, 5. mount. The correct sequence for creating an LVM logical volume is: first create physical volumes (PVs) with pvcreate, then the volume group (VG) with vgcreate, then the logical volume (LV) with lvcreate, then a filesystem on the LV with mkfs, and finally mount it. Any deviation from this order will fail because each step depends on the previous ones.

Answer

1. vgcreate, 2. pvcreate, 3. lvcreate, 4. mkfs, 5. mount

Answer

1. pvcreate, 2. lvcreate, 3. vgcreate, 4. mkfs, 5. mount

Answer

1. pvcreate, 2. vgcreate, 3. mkfs, 4. lvcreate, 5. mount

Question 8

Match each log file to its typical content.

Accepted Answer

/var/log/messages: General system messages and events. These log files are commonly monitored by sysadmins. Correct matches: /var/log/messages for general messages, /var/log/secure for authentication, /var/log/maillog for mail, /var/log/cron for cron jobs. Common confusions involve swapping secure and maillog.

Answer

/var/log/messages: Authentication and security-related messages

Answer

/var/log/secure: Mail server logs

Question 9

Order the steps to configure firewall rules to allow HTTP and HTTPS traffic using firewalld.

Accepted Answer

1. Add HTTP service: firewall-cmd --permanent --add-service=http
2. Add HTTPS service: firewall-cmd --permanent --add-service=https
3. Reload firewall: firewall-cmd --reload
4. Verify: firewall-cmd --list-services. Firewalld rules are added with --permanent flag and then reloaded to take effect.

Answer

1. Reload firewall: firewall-cmd --reload
2. Add HTTP service: firewall-cmd --permanent --add-service=http
3. Add HTTPS service: firewall-cmd --permanent --add-service=https
4. Verify: firewall-cmd --list-services

Answer

1. Add HTTP service: firewall-cmd --add-service=http (without --permanent)
2. Add HTTPS service: firewall-cmd --add-service=https (without --permanent)
3. Reload firewall: firewall-cmd --reload
4. Verify: firewall-cmd --list-services

Answer

1. Add HTTP service: firewall-cmd --permanent --add-service=http
2. Reload firewall: firewall-cmd --reload
3. Add HTTPS service: firewall-cmd --permanent --add-service=https
4. Verify: firewall-cmd --list-services

Question 10

Arrange the steps to configure a network bond (mode 1) using two interfaces (eth0, eth1) in RHEL.

Accepted Answer

Create bond interface config, then configure slave interfaces, then restart network. Network bonding requires creating a bond interface and configuring slaves, then restarting network.

Answer

Configure slave interfaces, then create bond interface config, then restart network

Answer

Restart network, then create bond interface config, then configure slave interfaces

Answer

Create bond interface config, then restart network, then configure slave interfaces

Question 11

Put the steps to configure a new swap partition of 2 GiB on /dev/sdc1 and enable it in order.

Accepted Answer

First, run mkswap /dev/sdc1 to format the partition as swap. Then, run swapon /dev/sdc1 to activate it. Finally, add an entry to /etc/fstab to make it persistent across reboots.. Swap configuration involves partitioning, formatting, enabling, and making persistent in fstab.

Answer

First, run swapon /dev/sdc1 to activate the swap. Then, run mkswap /dev/sdc1 to format it. Finally, add an entry to /etc/fstab.

Answer

First, add an entry to /etc/fstab for /dev/sdc1. Then, run mkswap /dev/sdc1. Finally, run swapon /dev/sdc1.

Answer

First, run mkswap /dev/sdc1. Then, add an entry to /etc/fstab. Finally, run swapon /dev/sdc1.

Question 12

Match each command to its function in managing storage.

Accepted Answer

fdisk: Manipulate disk partition table. The correct matches are: fdisk for partition table manipulation, mkfs for filesystem creation, mount for attaching filesystems, and lvcreate for logical volume creation. Common confusions include associating df or du with filesystem creation, and confusing lvcreate with display commands.

Answer

df: Create a filesystem

Answer

lvcreate: Display disk usage

Question 13

Match each package management command to its action.

Accepted Answer

dnf install: Installs a package with dependencies. In RHEL 8/9, DNF is the default package manager. 'dnf install' installs packages with dependencies, 'dnf remove' uninstalls, 'rpm -ivh' installs local RPMs without dependency resolution. 'dnf update' updates all packages, and 'dnf search' finds packages by keyword. Common confusions arise between install/update and remove/search.

Answer

dnf update: Installs a package with dependencies

Answer

dnf search: Removes a package

Question 14

A filesystem is reported as 'read-only' after a system crash. The admin runs fsck and sees 'clean' status. What is the most likely reason it remains read-only?

Accepted Answer

The filesystem is XFS, and fsck does not repair XFS.. If fsck reports 'clean', it means no errors were found in the filesystem's journal, so option D is incorrect. Option C is correct because XFS filesystems cannot be repaired by fsck; they require xfs_repair. Running fsck on an XFS filesystem simply reports the clean flag without performing a real check, leaving the kernel to enforce read-only status if any issues persist.

Answer

fsck cannot fix errors on ext4 filesystems.

Answer

The filesystem is still mounted; fsck cannot fix it while mounted.

Answer

fsck detected errors but did not fix them automatically.

Question 15

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

Accepted Answer

DNS resolution failure is preventing the registry hostname from being resolved.. The error indicates a DNS lookup failure, as shown by a timeout on port 53. Option D correctly identifies that DNS resolution is failing for the registry hostname. Option A (firewall blocking port 443) would result in a connection timeout on port 443, not a DNS error. Option B (invalid image name) would produce an 'image not found' or similar error. Option C (network outage) would generally cause connectivity issues but not specifically a DNS timeout.

Answer

The container registry is unreachable due to a firewall blocking port 443.

Answer

The image name is invalid.

Answer

The container registry is unreachable due to a network outage.

Question 16

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

Accepted Answer

SELinux context on /var/www/html/index.html is incorrect.. The most likely cause of the httpd service failure is that the SELinux context on /var/www/html/index.html is incorrect (option D). SELinux enforces mandatory access controls; without the proper context (httpd_sys_content_t), the Apache process is denied read access even if file permissions are correct. This results in the service starting but unable to serve content, often with 'Permission denied' in audit logs. Options A, B, and C are less likely because the service would fail differently or not start at all.

Answer

The httpd service is disabled.

Answer

The Apache configuration has a syntax error.

Answer

The /var/www/html directory does not exist.

Question 17

An administrator is migrating user accounts to a new system. They want to preserve the user's primary group name and GID. Which commands should be used in sequence?

Accepted Answer

groupadd --gid && useradd -g . Option C is correct. To preserve the primary group name and GID during migration, you must first create the group with the desired GID using `groupadd --gid `, then create the user with that group using `useradd -g `. Option A fails because the group does not exist; Option B fails for the same reason if the group is new; Option D is not a valid shell command sequence because 'then' is not a command.

Answer

useradd -u -g

Answer

useradd -g <group> <user>

Answer

groupadd -g then useradd -g

Question 18

A new intern created a script to display the current user's home directory:

#!/bin/bash
echo "Home directory: $home"

The script outputs 'Home directory: ' with nothing after the colon. What is the most likely cause?

Accepted Answer

There is a typo: it should be $HOME, not $home.. Option B is correct because bash is case-sensitive, and the variable should be $HOME, not $home. The environment variable HOME is set for all users and contains the path to their home directory. The script uses $home (lowercase), which is not a standard environment variable and is likely unset, resulting in an empty output. Option A is incorrect because HOME is typically set in the environment. Option C is incorrect because both sh and bash set the HOME variable, so using sh would not cause the issue. Option D is incorrect because the root user has a home directory (usually /root), and the issue is the variable name, not the user.

Answer

The HOME variable is not set in the environment.

Answer

The script is run with 'sh' instead of 'bash'.

Answer

The root user has no home directory.

Question 19

To enable per-user quotas on an XFS file system, which mount option should be used?

Accepted Answer

uquota. On XFS file systems, the correct mount option to enable per-user quotas is `uquota`. This is the XFS-specific shorthand that activates user quota accounting and enforcement. While `usrquota` is the option used on ext4 file systems, XFS requires `uquota`; the Red Hat EX200 exam tests the file-system-specific syntax, so only `uquota` is considered correct.

Answer

quota

Answer

usrquota

Answer

user_quota

Question 20

You are tasked with creating a script that reads a list of usernames from /tmp/users.txt, one per line, and creates a home directory for each user using `mkdir /home/$username`. The script is:

#!/bin/bash
while read username; do
  mkdir /home/$username
done < /tmp/users.txt

However, the script fails for usernames that contain spaces (e.g., 'john smith'). The error is 'mkdir: cannot create directory '/home/john': File exists' and then a separate directory for 'smith'. What is the best fix?

Accepted Answer

Use `while IFS= read -r username` to preserve the line as is.. Option D is correct. Setting `IFS=` (to an empty value) before the `read` command prevents the shell from splitting the line into fields based on whitespace. The `-r` option prevents backslash escapes from being interpreted. Together, they ensure that each line from the file is read exactly as is, preserving spaces in usernames. Option B is not sufficient because even though quoting `$username` prevents word splitting in the `mkdir` command, the `read` command itself splits the line before the variable is assigned, so the username is already broken into multiple words. Option A changes to a `for` loop that iterates over the output of `cat`, which also splits on whitespace and is subject to pathname expansion. Option C disables pathname expansion (globbing) but does not affect word splitting by `read`.

Answer

Change the loop to `for username in $(cat /tmp/users.txt)`.

Answer

Quote $username in the mkdir command as in `mkdir "/home/$username"`.

Answer

Add `set -f` to disable pathname expansion.