Lpi LPI Certifications 102-500 Questions & Answers

• Question 191:

  Which command makes the shell variable named VARIABLE visible to subshells?

  A. export $VARIABLE

  B. export VARIABLE

  C. set $VARIABLE

  D. set VARIABLE

  E. env VARIABLE

  Correct Answer: B

• Question 192:

  Which of the following words is used to restrict the records that are returned from a SELECT query based on a supplied criteria for the values in the records?

  A. LIMIT

  B. FROM

  C. WHERE

  D. IF

  Correct Answer: C

• Question 193:

  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}"

  Correct Answer: A

• Question 194:

  What result will the following script produce?

  echo 1 2 3 4 5 6' | while read a b c; do

  echo result $c $b $a;

  donated

  A. result: 345621

  B. result: 123456

  C. result: 654

  D. result: 654321

  E. result: 321

  Correct Answer: A

• Question 195:

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

  A. env

  B. set

  C. env -a

  D. echo $ENV

  Correct Answer: B

• Question 196:

  Which of the following configuration files should be modified to set default shell variables for all users?

  A. /etc/bashrc

  B. /etc/profile

  C. ~/.bash_profile

  D. /etc/.bashrc

  Correct Answer: B

• Question 197:

  Which of the following connection types, as seen in unroll connection show, may exist in Network Manager? (Choose Two correct answers.)

  A. tcp

  B. Ethernet

  C. wifi

  D. ipv6

  E. bridge

  Correct Answer: CE

  Explanation: The connection types, as seen in nmcli connection show, are the types of network configurations that Network Manager can manage. They are not the same as the network protocols or layers, such as TCP or IPv6, but rather the

  logical or physical ways of connecting to a network. According to the Network Manager reference manual1, some of the possible connection types are:

  wifi: This connection type is for wireless network interfaces that use the IEEE 802.11 standard. It requires a wifi device and a wifi access point to establish a connection. The connection settings include the SSID, security, password, etc.

  bridge: This connection type is for creating a network bridge, which is a device that connects two or more network segments and forwards packets between them. It requires a bridge device and one or more slave devices to be attached to the

  bridge. The connection settings include the bridge name, MAC address, STP, etc. vpn: This connection type is for creating a virtual private network, which is a secure tunnel between two or more network endpoints. It requires a VPN plugin

  and a VPN service provider to establish a connection. The connection settings include the VPN type, service name, user name, password, etc.

  The other options are not correct because:

  tcp: This is not a connection type, but a network protocol that operates at the transport layer. It provides reliable, ordered, and error-checked delivery of data between applications. It is not a configuration option for Network Manager. Ethernet:

  This is not a connection type, but a network technology that operates at the physical and data link layers. It defines the standards for wiring, signaling, and framing of data packets. It is not a configuration option for Network Manager, but

  rather a device type that can be used by other connection types, such as bridge or vpn.

  ipv6: This is not a connection type, but a network protocol that operates at the network layer. It provides addressing and routing of data packets across networks. It is not a configuration option for Network Manager, but rather an IP

  configuration option that can be used by other connection types, such as wifi or vpn.

  References:

  https://www.networkmanager.dev/docs/api/latest/nm-settings-nmcli.html

• Question 198:

  Depending on a system's configuration, which of the following files can be used to enable and disable network services running on this host?

  A. /etc/profile

  B. /etc/xinetd.conf

  C. /etc/ports

  D. /et/host.conf

  E. /etc/host.conf

  Correct Answer: B

  Explanation: The file that can be used to enable and disable network services running on this host is /etc/xinetd.conf. This file is the main configuration file for the xinetd daemon, which is a super-server that can start other network services on demand. The /etc/xinetd.conf file contains global settings and a list of services that xinetd can manage. Each service has its own configuration section, which can include the disable keyword to enable or disable the service. For example, to disable the telnet service, the configuration section would look like this12: service telnet { disable = yes socket_type = stream protocol = tcp wait = no user = root server = /usr/sbin/in.telnetd log_on_failure += USERID } The other files are not related to network services. The /etc/profile file is a global configuration file for the Bash shell, which sets environment variables and aliases for all users3. The /etc/ports file does not exist by default in Linux, and it is not a standard file for network configuration. The /et/host.conf file is a typo, and it should be /etc/host.conf, which is a file that controls the behavior of the resolver library, which is used to look up host names and IP addresses4. The /etc/host.conf file is not used to enable or disable network services, but to specify the order of host name resolution methods5. References:

  1: How to enable or disable services with xinetd - LinuxConfig.org

  2: xinetd.conf(5) - Linux manual page - man7.org

  3: What is /etc/profile file in Linux? - LinuxForDevices

  4: host.conf(5) - Linux manual page - man7.org

  5: Linux host.conf file - Computer Notes

• Question 199:

  On a machine running serval X servers. How do programs identify the different instances of theX11 server?

  A. By a fixed UUID that is defined in the X11 configuration file.

  B. By a display name like :1.

  C. By the name of the user that turns the X server like x11: bob.

  D. By a device name like /dov/x11/xeorvore/1.

  E. By a unique IPv6 address from the fc80: /64 subnet.

  Correct Answer: B

  Explanation: On a machine running several X servers, programs identify the different instances of the X11 server by a display name like :1. The display name consists of three parts: the hostname, the display number, and the screen number. The hostname is the name of the machine where the X server runs. The display number is a unique identifier that distinguishes different X server instances on the same machine. The screen number is used to address different physical screens that are managed by the same X server instance. The display name has the format hostname:displaynumber.screennumber. If the hostname is omitted, it means the local machine. The screen number is also optional and defaults to

  0.

  For example, :1 means the second X server instance on the local machine, screen 0. remote:0.1 means the first X server instance on the remote machine, screen

  1.

  The display name is part of the topic 106.1: Install and configure X11, which is one of the objectives of the LPI Linux Administrator - 102 exam12. References: 1: LPI Linux Administrator - 102 (LPIC-1) 2: Exam 102 Objectives