secreto 102 parte

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

Which of the following is a valid IPv6 address?. 2001:db8:0g21::1. 2001::db8:4581::1. 2001:db8:3241::1. 2001%db8%9990%%1. 2001.db8.819f..1.

FILL BLANK 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.

FILL BLANK Which command included in NetworkManager is a curses application which provides easy acces to the NetworkManager on the command line? (Specify only the command without any path or parameters.).

Which if the following tools, used for DNS debugging, reports not only the response from the name sever but also details about the query?. dnsq. hostname. dig. dnslookup. zoneinfo.

Which of the following statements is valid in the file /etc/nsswitch.conf?. multi on. 192.168.168.4 dns-server. namespaces: net mount procs. include /etc/nsswitch.d/. hosts: files dns.

Which of the following connection types, as seen in nmcli connection show, may exist in NetworkManager? (Choose three.). tcp. ethernet. wifi. ipv6. bridge.

On a Linux workstation, the route command takes a long time before printing out the routing table. Which of the following errors does that indicate?. The local routing information may be corrupted and must be re-validated using a routing protocol. One of the routers in the routing table is not available which causes the automatic router failure detection mechanism (ARF-D) to wait for a timeout. There may accidentally be more than one default router in which case a default router election has to be done on the network in order to choose one router as the default. The Linux Kernel Routing Daemon (LKRD) is not running and should be started using its init script or systemd unit. DNS resolution may not be working as route by default tries to resolve names of routers and destinations and may run into a timeout.

What is true about the Hop Limit field in the IPv6 header?. The field is not changed during the transport of a package. The field is transmitted within a hop-by-hop extension header. Each router forwarding the packet increases the field’s value. Each router forwarding the packet decreases the field’s value. For multicast packages, the field’s value is always 1.

Which of the following nmcli subcommands exist? (Choose two.). nmcli ethernet. nmcli device. nmcli wifi. nmcli address. nmcli connection.

Which of the following changes may occur as a consequence of using the command ip? (Choose three.). Network interfaces may become active or inactive. New name servers may be added to the resolver configuration. The system’s host name may change. IP addresses may change. The routing table may change.

How many IP addresses can be used for unique hosts inside the IPv4 subnet 192.168.2.128/26?. 6. 14. 30. 62. 126.

Which of the following IPv4 networks are reserved by IANA for private address assignment and private routing? (Choose three.). 10.0.0.0/8. 127.0.0.0/8. 169.255.0.0/16. 172.16.0.0/12. 192.168.0.0/16.

Which of the following commands configure network interfaces based on the system’s existing distributionspecific configuration files? (Choose two.). ifconf. ifdown. ifpause. ifstart. ifup.

Which of the following statements is true if the UID of a regular user is identical to the GID of a group?. UID have precedence over GIDs, therefore the user is available while the group doesn’t. The user as well as the group are not available to avoid ambiguity due to the ID conflict. UIDs and GIDs are independent of each other, therefore the user as well as the group are still available. The user is the only member of the group, even if the group configuration contains other members. GIDs have precedence over UIDs, therefore the group is available while the user isn’t.

Which of the following information is stored in /etc/shadow for each user?. The timestamp of the user’s last login. The user’s private SSH keys. The hashed password of the user. The numerical user ID (UID). The path to the user’s home directory.

Which of the following commands shows all active systemd timers?. systemctl-timer show. timectl list. systemctl –t. systemctl list-timers. timeq.

Which of the following tasks can the date command accomplish? (Choose two.). Set the system’s date and time. Set the system’s date but not the time. Calculate the time span between two dates. Print a calendar for a month or a year. Display time in a specific format.

FILL BLANK 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.).

What can be specified with useradd? (Choose two.). Commands the user can run using sudo. The absolute path to the user’s home directory. Which printers are available for the new user. The SSH keys used to login to the new account. The numeric user ID (UID) of the user.

What is true about the file /etc/localtime?. It is a plain text file containing a string such as Europe/Berlin. It is created and maintained by the NTP service based on the location of the system’s IP address. It is a symlink to /sys/device/clock/ltime and always contains the current local time. After changing this file, newtzconfig has to be run to make the changes effective. 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 regarding systemd timer units?. Timer units can only be defined within a service unit’s file. The command executed by the timer is specified in the timer unit’s [Cmd] section. A dedicated system service, systemd-cron, handles the execution of timer units. Timer units only exist in the system scope and are not available for users. Each systemd timer unit controls a specific systemd service unit.

Which of the following fields are available in the standard format of both the global /etc/crontab file as well as in user-specific crontab files? (Choose two.). Year. Minute. Username. Effective group ID. Command.

Which of the following commands should be executed when starting a login shell in order to change the language of messages for an internationalized program to Portuguese (pt)?. export LANGUAGE=“pt”. export LC_MESSAGES=“pt”. export UI_MESSAGES=“pt”. export MESSAGE=“pt”. export ALL_MESSAGES=“pt”.

Which of the following files assigns a user to its primary group?. /etc/pgroup. /etc/shadow. /etc/passwd. /etc/group. /etc/gshadow.

Which of the following steps prevents a user from obtaining an interactive login session?. Setting the UID for the user to 0. Running the command chsh –s /bin/false with the user name. Removing the user from the group staff. Adding the user to /etc/noaccess. Creating a .nologin file in the user’s home directory.

FILL BLANK Which command included in systemd supports selecting messages from the systemd journal by criteria such as time or unit name? (Specify only the command without any path or parameters.).

Which of the following statements about systemd-journald are true? (Choose three.). It is incompatible with syslog and cannot be installed on a system using regular syslog. It only processes messages of systemd and not messages of any other tools. It can pass log messages to syslog for further processing. It maintains metadata such as _UID or _PID for each message. It supports syslog facilities such as kern, user, and auth.

FILL BLANK Which command must be run after adding a new email alias to the configuration in order to make this change effective? (Specify the command without any path but including all required parameters.).

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?. iburst. quickstart. fast. fsync. flood.

Which of the following commands is used to rotate, compress, and mail system logs?. logrotate. striplog. syslogd –-rotate. rotatelog. logger.

Why is the correct configuration of a system’s time zone important?. Because the timezone is included in checksum calculations and timezone changes invalidate existing checksums. Because the time zone is saved as part of the modification times of files and cannot be changed after a file is created. Because the environment variables LANG and LC_MESSAGES are, by default, set according to the time zone. Because NTP chooses servers nearby based on the configured time zone. Because the conversion of Unix timestamps to local time relies on the time zone configuration.

FILL BLANK Which command, available with all sendmail-compatible MTAs, is used to list the contents of the MTA’s mail queue? (Specify only the command without any path or parameters.).

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

Which of the following commands lists all queued print jobs?. lpd. lpr. lp. lsq. lpq.

Which of the following entries in /etc/syslog.conf writes all mail related events to the file /var/log/ maillog and sends all critical events to the remote server logger.example.com?. mail.* /var/log/maillog mail,crit @logger.example.org. mail.* /var/log/maillog mail.crit syslog://logger.example.org. mail /var/log/maillog mail.crit @logger.example.org. mail.* /var/log/maillog mail.crit @logger.example.org. mail * /var/log/maillog mail crit @logger.example.org.

FILL BLANK Which option in the /etc/ntp.conf file specifies an external NTP source to be queried for time information? (Specify only the option without any values or parameters.).

Which of the following protocols is related to the term open relay?. SMTP. POP3. NTP. IMAP. LDAP.

Which of the following commands displays all environment and shell variables?. getargs. lsenv. ls. env. lsshell.

Which of the following comparison operators for test work on elements in the file system? (Choose two.). –z. –eq. –d. –f. –lt.

What information is provided by the echo $$ command?. The process ID of the current shell. The process ID for the following command. The process ID of the last command executed. The process ID of the last command which has been placed in the background. The process ID of the echo command.

Which command makes the shell variable named VARIABLE visible to subshells?. export $VARIABLE. env VARIABLE. set $VARIABLE. set VARIABLE. export VARIABLE.

What output is produced by the following command sequence? echo ‘1 2 3 4 5 6’ | while read a b c; do echo result $c $b $a; done. result: 6 5 4. result: 1 2 3 4 5 6. result: 3 4 5 6 2 1. result: 6 5 4 3 2 1. result: 3 2 1.

Which of the following configuration files should be modified to globally set shell variables for all users?. /etc/profile. /etc/bashrc. ~/.bash_profile. /etc/.bashrc. /etc/shellenv.

What output does the command seq 10 produce?. A continuous stream of numbers increasing in increments of 10 until the command is stopped. It creates no output because a second parameter is missing. The number 0 through 9 with one number per line. The number 10 to standard output. The numbers 1 through 10 with one number per line.

FILL BLANK What command list the aliases defined in the current Bash shell? (Specify only the command without any path or parameters.).

Which of the following commands can be used to limit the amount of memory a user may use?. umask. usermod. passwd. ulimit. chage.

What is a purpose of an SSH host key?. It must be sent by any SSH client in addition to a user key in order to identify the client’s host. It is root key by which all user SSH keys must be signed. It provides the server’s identity information to connecting SSH clients. It authenticates any user that logs into a remote machine from the key’s host. It is used by system services like cron, syslog or a backup job to automatically connect to remote hosts.

What is the purpose of TCP wrapper?. Manage and adjust bandwidth used by TCP services. Bind a network service to a TCP port. Encapsulate TCP messages in IP packets. Add SSL support to plain text TCP services. Limit access to a network service.

Given the following excerpt of the sudo configuration: jane ANY=NOPASSWD: /bin/kill, /bin/id, PASSWD: /sbin/fdisk Which of the following statements are true? (Choose three.). Jane can run /bin/id only after specifying her password. Jane can run /sbin/fdisk after specifying root’s password. Jane can run /sbin/fdisk after specifying her password. Jane can run /bin/kill without specifying a password. Jane can run /bin/id without specifying her password.

Which configuration file contains the default options for SSH clients?. /etc/ssh/sshd_config. /etc/ssh/ssh. /etc/ssh/ssh_config. /etc/ssh/client. /etc/ssh/ssh_client.

Depending on a system’s configuration, which of the following files can be used to enable and disable network services running on this host?. /etc/profile. /etc/xinetd.conf. /etc/ports. /etc/services. /etc/host.conf.

Which of the following commands can identify the PID od a process which opened a TCP port?. ptrace. strace. debug. lsof. nessus.

FILL BLANK 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.).

FILL BLANK The presence of what file will temporarily prevent all users except root from logging into a system? (Specify the full name of the file, including path.).

Which of the following commands preloads and manages existing SSH keys that are used for automatic authentication while logging in to order machines using SSH?. sshd. ssh-keyring. ssh-keygen. ssh-pki. ssh-agent.

On a machine running several X servers, how do programs identify the different instances of the X11 server?. By a fixed UUID that is defined in the X11 configuration file. By a display name like: 1. By the name of the user that runs the X server like x11:bob. By a device name like /dev/X11/xservers/1. By a unique IPv6 address from the fe80::/64 subnet.

What is the purpose of a screen reader?. It manages virtual keyboards on touch screen displays. It reads the parameters of the attached monitors and creates an appropriate X11 configuration. It displays lines and markers to help people use speed reading techniques. It manages and displays files that contain e-books. It reads displayed text to accommodate the needs of blind or visually impaired people.

The X11 configuration file xorg.conf is grouped into section. How is the content of the section SectionName represented?. It is placed in curly brackets as in Section SectionName {…}. It is placed between the tags <Section name=“SectionName”> and </Section>. It is placed between a line containing Section “SectionName” and a line containing EndSection. It is placed after the row [SectionName]. It is placed after an initial unindented Section “SectionName” and must be indented by exactly one tab character.

Which of the following features are provided by SPICE? (Choose two.). Connecting local USB devices to remote applications. Accessing graphical applications on a remote host. Replacing Xorg as local X11 server. Downloading and locally installing applications from a remote machine. Uploading and running a binary program on a remote machine.