Which of the following is a valid IPv6 address?

A. 2001:db8:0g21::1

B. 2001::db8:4581::1

C. 2001:db8:3241::1

D. 2001.db8.819f..1

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Which command is used to sync the hardware clock to the system clock? (Specify only the command without any path or parameters.)
hwclock

Which if the following tools, used for DNS debugging, reports not only the response from the name sever but also details about the query?

A. dnsq

B. hostname

C. dig

D. dnslookup

E. zoneinfo

Which of the following IPv4 networks are reserved by IANA for private address assignment and private routing? (Choose three.)

A. 10.0.0.0/8

B. 127.0.0.0/8

C. 169.255.0.0/16

D. 172.16.0.0/12

E. 192.168.0.0/16

Which of the following files is not read directly by a Bash login shell?

A. ~/.bashrc

B. ~/.bash_profile

C. ~/.bash_login

D. ~/.profile

E. /etc/profile

Which of the following commands lists all defines variables and functions within Bash?

A. env

B. export

C. env -a

D. set

E. echo $ENV

Which of the following getent invocations lists all existing users?

A. getent homes

B. getent uids

C. getent passwd

D. getent users

E. getent logins

Which of the following statements is true regarding systemd timer units?

A. Timer units can only be defined within a service unit’s file.

B. The command executed by the timer is speci ed in the timer unit’s [Cmd] section.

C. A dedicated system service, systemd-cron, handles the execution of timer units.

D. Timer units only exist in the system scope and are not available for users.

E. Each systemd timer unit controls a specific systemd service unit.

If an alias ls exists, which of the following commands updates the alias to point to the command ls -l instead of the alias's current target?

A. set ls=’ls -l’

B. alias ls=’ls -l’

C. alias –force ls=’ls -l’

D. alias –update ls ls=’ls -l’

E. realias ls=’ls -l’

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What command, depending on its options, can display the open TCP connections, the routing tables, as well as network interface statistics? (Specify only the command without any path or parameters.)

Which of the following commands configure network interfaces based on the system's existing distribution-specific configuration files? (Choose two.)

A. ifconf

B. ifdown

C. ifpause

D. ifstart

E. ifup

Which of the following commands puts the output of the command date into the shell variable mydate?

A. mydate= date

B. mydate= exec date

C. mydate= $((date))

D. mydate= $(date)

E. mydate= ${date}

Which of the following nmcli subcommands exist? (Choose two.)

A. nmcli ethernet

B. nmcli device

C. nmcli wi

D. nmcli address

E. nmcli connection

Which of the following commands shows all active systemd timers?

A. systemctl-timer show

B. timectl list

C. systemctl “t

D. systemctl list-timers

E. timeq

What is true regarding the statement beginning with #! that is found in the first line of script? (Choose two.)

A. It prevents the scripts from being executed until the ! is removed.

B. it triggers the installation of the script’s interpreter.

C. It speci es the path and the arguments of the interpreter used to run the script.

D. It defines the character encoding of the script.

E. It is a comment that is ignored by the script interpreter.

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What command is used to add OpenSSH private keys to a running ssh-agent instance? (Specify the command name only without any path.)
ssh-add

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Which parameter of the ssh command speci es the location of the private key used for login attempts? (Specify only the option name without any values or parameters.)

Which of the following is true about IPv6?

A. IPv6 no longer supports broadcast addresses.

B. With IPv6, the TCP port numbers of most services have changed.

C. IPv4 addresses can be used without any change with IPv6.

D. IPv6 no longer supports multicast addresses.

E. For IPv6, UDP and TCP have been replaced by the Rapid Transmission Protocol RTP.

What is true about the Hop Limit field in the IPv6 header?

A. The field is not changed during the transport of a package.

B. The field is transmitted within a hop-by-hop extension header.

C. Each router forwarding the packet increases the field’s value.

D. Each router forwarding the packet decreases the field’s value.

E. For multicast packages, the field’s value is always 1.

What can be speci ed with useradd? (Choose two.)

A. Commands the user can run using sudo.

B. The absolute path to the user’s home directory.

C. Which printers are available for the new user.

D. The SSH keys used to login to the new account.

E. The numeric user ID (UID) of the user.

What is a purpose of an SSH host key?

A. It must be sent by any SSH client in addition to a user key in order to identify the client’s host.

B. It is root key by which all user SSH keys must be signed.

C. It provides the server’s identity information to connecting SSH clients.

D. It authenticates any user that logs into a remote machine from the key’s host.

E. It is used by system services like cron, syslog or a backup job to automatically connect to remote hosts.

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Which file, if present, must contain all users that are allowed to use the cron scheduling system? (Specify the full name of the file, including path.)

Which mechanism does ssh use to interact with the SSH agent?

A. Connecting to port 2222 which is used by the system-wide SSH agent.

B. Using the fixed socket .ssh-agent/ipc.

C. Creating an alias replacing ssh with calls to ssh-agent.

D. Starting ssh-agent as a child process for each ssh invocation.

E. Evaluating environment variables such as SSH_AUTH_SOCK.

What information is shown by the echo $? command?

A. The process ID of the echo command.

B. The exit value of the command executed immediately before echo.

C. The process ID which will be used for the next command.

D. The exit value of the echo command.

E. The process ID of the current shell.

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Which environment variable is used by an X11 client to determine the X Server to connect to? (Specify only the variable name without any preceding commands or values.)

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What is the top-level directory which contains the configuration files for CUPS? (Specify the full path to the directory.)

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What command enables a network interface according to distribution-specific configuration, such as /etc/network/interfaces or /etc/sysconfig/ network-scripts/ifcfg-eth0? (Specify only the command without any path or parameters.)

What is the purpose of a screen reader?

A. It manages virtual keyboards on touch screen displays.

B. It reads the parameters of the attached monitors and creates an appropriate X11 configuration.

C. It displays lines and markers to help people use speed reading techniques.

D. It manages and displays files that contain e-books.

E. It reads displayed text to accommodate the needs of blind or visually impaired people.

What output does the command seq 1 5 20 produce?

A. 1

B. 1

C. 1

D. 2

E. 5

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Which command is used to set the hostname of the local system? (Specify only the command without any path or parameters.)
hostname

Which of the following tasks can the date command accomplish? (Choose two.)

A. Set the system’s date and time.

B. Set the system’s date but not the time.

C. Calculate the time span between two dates.

D. Print a calendar for a month or a year.

E. Display time in a specific format.

What information is provided by the echo $$ command?

A. The process ID of the current shell.

B. The process ID for the following command.

C. The process ID of the last command executed.

D. The process ID of the last command which has been placed in the background.

E. The process ID of the echo command.

Which of the following states can NetworkManager show regarding the system's network connectivity? (Choose two.)

A. up

B. portal

C. full

D. login-required

E. rewalled

What is true about the file /etc/localtime?

A. It is a plain text file containing a string such as Europe/Berlin

B. It is created and maintained by the NTP service based on the location of the system’s IP address.

C. It is a symlink to /sys/device/clock/ltime and always contains the current local time.

D. After changing this file, newtzconfig has to be run to make the changes effective.

E. It is either a symlink to or a copy of a timezone information file such as /usr/share/zoneinfo/Europe/Berlin.

Which of the following statements is true if the UID of a regular user is identical to the GID of a group?

A. UID have precedence over GIDs, therefore the user is available while the group doesn’t.

B. The user as well as the group are not available to avoid ambiguity due to the ID conflict.

C. UIDs and GIDs are independent of each other, therefore the user as well as the group are still available.

D. The user is the only member of the group, even if the group configuration contains other members.

E. GIDs have precedence over UIDs, therefore the group is available while the user isn’t.

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Which directory holds configuration files for xinetd services? (Specify the full path to the directory.)

Which of the following commands lists all queued print jobs?

A. lpd

B. lpr

C. lp

D. lsq

E. lpq

Which of the following elds are available in the standard format of both the global /etc/crontab file as well as in user-specific crontab files? (Choose two.)

A. Year

B. Minute

C. Username

D. Effective group ID

E. Command

Which file inside the CUPS configuration directory contains the settings of the printers?

A. cups-devices.conf

B. snmp.conf

C. printers.conf

D. printcap.conf

E. cupsd.conf

How many IP addresses can be used for unique hosts inside the IPv4 subnet 192.168.2.128/26?

A. 6

B. 14

C. 30

D. 62

E. 126

Which standardized TCP port is used by HTTPS services?

A. 25

B. 80

C. 8080

D. 443

E. 636

Which option in the chrony configuration file changes the initial interval of polls to a NTP server in order to speed up the initial synchronization?

A. iburst

B. quickstart

C. fast

D. fsync

E. ood

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Which parameter is missing in the command
ip link set ____ dev eth0
to activate the previously inactive network interface eth0? (Specify the parameter only without any command, path or additional options.)

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When using X11 forwarding in SSH, what environment variable is automatically set in the remote shell in order to help applications to connect to the correct X11 server? (Specify only the environment variable without any additional commands or values.)

After editing the TCP wrapper configuration to grant specific hosts access to a service, when do these changes become effective?

A. The new configuration becomes effective after restarting the respective service.

B. The new configuration becomes effective at the next system reboot.

C. The new configuration becomes effective when the last established connection to the service is closed.

D. The new configuration becomes effective after restarting the tcpd service.

E. The new configuration becomes effective immediately for all new connections.

Which of the following commands can identify the PID od a process which opened a TCP port?

A. ptrace

B. strace

C. debug

D. lsof

E. nessus

What is true about the following command?
nmcli device wi connect WIFIoI

A. NetworkManager opens a new public hotspot with the SSID WIFIoI.

B. NetworkManager creates an unconfigured new virtual network interface named WIFIoI.

C. NetworkManager creates a new wi connection WIFIoI and activates it.

D. NetworkManager returns an error in case the connection WIFIoI does not exist.

E. NetworkManager returns an error because WIFIoI is an invalid wi device.

What output does the command seq 10 produce?

A. A continuous stream of numbers increasing in increments of 10 until the command is stopped.

B. It creates no output because a second parameter is missing.

C. The number 0 through 9 with one number per line.

D. The number 10 to standard output.

E. The numbers 1 through 10 with one number per line.

If neither cron.allow nor cron.deny exist in /etc/, which of the following is true?

A. Without additional configuration, all users may create user specific crontabs.

B. Without additional configuration, only root may create user specific crontabs.

C. The cron daemon will refuse to start and report missing files in the system’s log file.

D. When a user creates a user specific crontab the system administrator must approve it explicitly.

E. The default settings of /etc/crond.conf define whether or not user specific crontabs are generally allowed or not.

What information related to a user account is modified using the chage command?

A. Default ownership for new files

B. Group membership

C. Set of commands available to the user

D. Password expiry information

E. Default permissions for new files