EX200 Practice Test 22 — 15 Questions

Question 1

Which TWO methods can be used to permanently set the system's hostname to 'server01.example.com'?

Accepted Answer

hostnamectl set-hostname server01.example.com. `hostnamectl set-hostname server01.example.com` is the systemd-based command that permanently sets the hostname by writing to `/etc/hostname` and applying the change immediately via the `hostnamed` service. This is the recommended method on RHEL 8/9 systems, as it updates both the transient and static hostnames, ensuring persistence across reboots.

Answer

echo '127.0.1.1 server01.example.com' >> /etc/hosts

Answer

hostname server01.example.com

Answer

echo 'HOSTNAME=server01.example.com' >> /etc/sysconfig/network

Question 2

Which TWO commands can be used to display the current SELinux mode?

Accepted Answer

getenforce. The `getenforce` command (option C) displays the current SELinux mode as either Enforcing, Permissive, or Disabled. The `sestatus` command (option D) provides a detailed status report including the current mode, the loaded policy, and the mode from the configuration file. Both are standard tools for querying the SELinux operational state.

Answer

setenforce

Answer

ausearch

Answer

semanage

Question 3

Which three of the following are required steps to create a new logical volume of 5GB in an existing volume group 'vg00'?

Accepted Answer

Create a logical volume with lvcreate. `lvcreate` is the command used to create a new logical volume within an existing volume group. For a 5GB volume in vg00, the command would be `lvcreate -L 5G -n lvname vg00`. This step is mandatory to allocate the logical volume from the free extents in the volume group.

Answer

Create a physical volume

Answer

Create a volume group

Question 4

Which THREE commands are used to manage SELinux file security contexts? (Select exactly three.)

Accepted Answer

chcon. B (chcon) is correct because it changes the SELinux security context of a file or directory immediately, without reference to the SELinux policy database. This is useful for temporary or one-off changes, but the context may be overwritten by restorecon or a file system relabel.

Answer

setenforce

Answer

selinux

Question 5

Which THREE of the following are valid utilities for creating partitions on a disk in Red Hat Enterprise Linux?

Accepted Answer

fdisk. C is correct because `fdisk` is a traditional command-line utility for creating, deleting, and managing MBR (Master Boot Record) partition tables on disks in Red Hat Enterprise Linux. It supports interactive and scripted partitioning, making it a valid tool for local storage configuration.

Answer

mkfs

Answer

mount

Question 6

Which THREE of the following are valid methods to schedule a recurring task in Red Hat Enterprise Linux 8? (Choose exactly three.)

Accepted Answer

Creating a systemd timer unit. Systemd timer units are the modern, recommended method for scheduling recurring tasks in RHEL 8. They replace traditional cron-based scheduling by leveraging systemd's service and timer units, providing features like monotonic timers, calendar events, and integration with systemd's logging and dependency management.

Answer

Using the 'batch' command

Answer

Using the 'at' command

Question 7

Which TWO of the following commands can be used to create an XFS filesystem on a block device?

Accepted Answer

mkfs.xfs /dev/sdb1. The `mkfs.xfs` command (option B) directly creates an XFS filesystem on a block device. The `mkfs -t xfs` command (option E) is the generic front-end that calls the same XFS-specific tool, making both valid. These are the standard methods for formatting a partition with the XFS filesystem in Red Hat Enterprise Linux.

Answer

mkfs.ext4 /dev/sdb1

Answer

xfs_admin /dev/sdb1

Answer

mke2fs /dev/sdb1

Question 8

Based on the exhibit, which device is used for swap?

Accepted Answer

The UUID deadbeef-cafe-babe-0000-000000000000. The exhibit shows a swap partition with the UUID deadbeef-cafe-babe-0000-000000000000. In Red Hat Enterprise Linux, swap devices are identified by their UUID in /etc/fstab, and the 'sw' or 'swap' keyword in the mount options column confirms this. The other UUIDs correspond to non-swap filesystems or are not present in the exhibit.

Answer

/dev/mapper/vg00-home

Answer

/dev/sda2

Answer

The UUID abcdef01-2345-6789-abcd-ef0123456789

Answer

The UUID 12345678-1234-1234-1234-123456789abc

Question 9

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 . 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 10

Which THREE file descriptors are always available for every Unix process?

Accepted Answer

2: stderr. File descriptor 2 (stderr) is one of the three standard file descriptors that every Unix process inherits from its parent process. These descriptors are opened automatically by the kernel when a process starts, providing default channels for input (stdin, fd 0), output (stdout, fd 1), and error output (stderr, fd 2).

Answer

4: socket

Answer

3: log file

Question 11

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 12

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 13

Which TWO commands can be used to create a filesystem on a new partition? (Choose two.)

Accepted Answer

mkfs /dev/sdb1. B is correct because `mkfs` is the generic command to create a filesystem on a partition. D is correct because `mkfs.ext4` is a specific variant of `mkfs` that creates an ext4 filesystem. Both commands write the filesystem metadata to the partition, making it ready for mounting.

Answer

mount /dev/sdb1 /mnt

Answer

parted /dev/sdb

Answer

fdisk /dev/sdb

Question 14

Match each file system type to its description.

Accepted Answer

ext4: Standard journaling file system for Linux.. In RHEL, ext4 is the standard journaling file system, XFS excels with large files, and Btrfs provides advanced features like snapshots. Swap is used for virtual memory, not data storage.

Answer

swap: A file system used for storing temporary files (/var/tmp).

Answer

ext4: A file system that supports subvolumes and snapshots.

Question 15

During a security audit, an administrator needs to list all TCP ports on which the system is listening, showing only the port numbers and the associated process names. Which command best achieves this?

Accepted Answer

sudo ss -tlnp. `sudo ss -tlnp` lists TCP listening sockets with numeric port numbers and process names. The `-t` flag filters for TCP, `-l` shows only listening sockets, `-n` displays numeric addresses/ports (avoiding DNS resolution), and `-p` reveals the process name. This command requires root privileges to see process information, hence `sudo`.

Answer

netstat -tulpn

Answer

nmap -sT localhost

Answer

lsof -i TCP:1-65535