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NEW QUESTION # 75
Which standardized TCP port is used by HTTPS services?
- A. 0
- B. 1
- C. 2
- D. 3
- E. 4
Answer: B
NEW QUESTION # 76
Given the following routing table:
How would an outgoing packet to the destination 192.168.2.150 be handled?
- A. It would be directly transmitted on the device wlan0.
- B. It would be directly transmitted on the device eth0.
- C. It would be passed to the default router 255.255.255.0 on eth0.
- D. It would be passed to the default router 192.168.178.1 on wlan0.
- E. It would be passed to the router 192.168.1.1 on eth0.
Answer: E
Explanation:
The routing table shows how the kernel will route packets to different destinations based on the destination IP address, the gateway, the netmask, the flags, the metric, and the interface. The kernel will try to find the most specific route that matches the destination IP address, which means the route with the longest netmask. If there are multiple routes with the same netmask, the kernel will use the route with the lowest metric. If there is no matching route, the kernel will use the default route, which is the route with the destination 0.0.0.0.
In this case, the destination IP address is 192.168.2.150, which belongs to the network 192.168.2.0/24. The routing table has a specific route for this network, which is the second entry. The gateway for this route is
0.0.0.0, which means that the packet will be directly transmitted on the interface eth0, without passing through any router. The netmask for this route is 255.255.255.0, which means that the network has 256 possible hosts.
The flags for this route are U, which means that the route is up, and G, which means that the route is to a gateway. The metric for this route is 0, which means that it has the highest priority. Therefore, the kernel will use this route to handle the outgoing packet to the destination 192.168.2.150.
References:
* How To Display Routing Table In Linux - RootUsers
* route command in Linux with Examples - GeeksforGeeks
* Understand the basics of Linux routing | TechRepublic
NEW QUESTION # 77
When using PAP with PPP, the /etc/ppp/pap-secrets file must be
- A. world-readable
- B. readable and executable by user root and group ppp
- C. readable only by root
- D. readable only by the ppp user
Answer: C
NEW QUESTION # 78
On a machine running several X servers, how do programs identify the different instances of the X11 server?
- A. By a unique IPv6 address from the fe80::/64 subnet.
- B. By a fixed UUID that is defined in the X11 configuration file.
- C. By a display name like: 1.
- D. By a device name like /dev/X11/xservers/1.
- E. By the name of the user that runs the X server like x11:bob.
Answer: C
NEW QUESTION # 79
Which commands can you use to change a user's account aging information? (Choose THREE correct answers.)
- A. chage
- B. chattr
- C. passwd
- D. usermod
- E. chsh
Answer: A,C,D
NEW QUESTION # 80
Which of the following lines are valid in the file /etc/hosts? (Choose TWO correct answers.)
- A. www.example.com,www 203.0.13.15,2001:db8::15
- B. 2003.0.113.15,2001:db8::15 www.example.com www
- C. 203.0.113.15 www.example.com www
- D. 2001:db8::15 www.example.com www
- E. www.example.com www 203.0.13.15
Answer: C,D
Explanation:
The valid lines in the file /etc/hosts are A and C. The format of the /etc/hosts file is as follows12:
IP_address canonical_hostname [aliases...]
where IP_address is the IPv4 or IPv6 address of the host, canonical_hostname is the official name of the host, and aliases are optional alternative names for the host. Each field is separated by whitespace (spaces or tabs).
The # character indicates the beginning of a comment, and the rest of the line is ignored.
The lines B, D, and E are invalid because they do not follow the format of the /etc/hosts file. Line B has the hostname and aliases before the IP address, which is incorrect. Line D has multiple IP addresses and hostnames separated by commas, which is also incorrect. Line E has two IP addresses for the same host, which is not supported by the /etc/hosts file. If a host has more than one IP address, it should have a separate line for each address3.
References:
* 1: hosts(5) - Linux manual page - man7.org
* 2: Format of /etc/hosts on Linux (different from Windows?)
* 3: hosts File Format for TCP/IP - IBM
NEW QUESTION # 81
What can be specified with useradd? (Choose two.)
- A. Which printers are available for the new user.
- B. Commands the user can run using sudo.
- C. The SSH keys used to login to the new account.
- D. The absolute path to the user's home directory.
- E. The numeric user ID (UID) of the user.
Answer: D,E
NEW QUESTION # 82
Which of the following commands can identify the PID od a process which opened a TCP port?
- A. strace
- B. nessus
- C. ptrace
- D. debug
- E. lsof
Answer: E
NEW QUESTION # 83
Which bash option will prevent you from overwriting a file with a ">"?
- A. set -o nooverwrite
- B. set -o append
- C. set -o noglob
- D. set -o noclobber
- E. set -o safe
Answer: D
NEW QUESTION # 84
X is running okay but you're concerned that you may not have the right color depth set. What single command will show you the running color depth while in X?
- A. xwininfo
- B. xcdepth
- C. xcd
- D. xcolordepth
- E. cat /etc/X11
Answer: A
NEW QUESTION # 85
Which configuration file contains the default options for SSH clients?
- A. /etc/ssh/ssh_config
- B. /etc/ssh/ssh
- C. /etc/ssh/ssh_client
- D. /etc/ssh/client
- E. /etc/ssh/sshd_config
Answer: A
Explanation:
The configuration file that contains the default options for SSH clients is /etc/ssh/ssh_config. This file is read by the ssh program when it connects to a remote SSH server. It can contain global options that apply to all hosts, or host-specific options that only apply to certain hosts or patterns. The /etc/ssh/ssh_config file is the system-wide default SSH client configuration file. It can be overridden by a user-specific configuration file
~/.ssh/config, which is located in the user's home directory. The /etc/ssh/ssh_config file is part of the topic
110.1: Perform security administration tasks, 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
NEW QUESTION # 86
Which of the following is a valid IPv6 address?
- A. 2001::db8:4581::1
- B. 2001:db8:3241::1
- C. 2001%db8%9990%%1
- D. 2001.db8.819f..1
- E. 2001:db8:0g21::1
Answer: B
NEW QUESTION # 87
What is NOT contained in the locale setting of the operating system?
- A. language
- B. thousands separator
- C. currency symbol
- D. timezone
Answer: D
Explanation:
The locale setting of the operating system is a set of environmental variables that defines the language, country, and character encoding settings (or any other special variant preferences) for the applications and shell session on a Linux system12. The locale setting usually consists of at least a language code and a country/region code, such as en_US for English (United States) or fr_FR for French (France). The locale setting also affects things such as the currency symbol, the thousands separator, the decimal point, the date and time format, the collation order, the paper size, the telephone number format, and many other values formatted in accordance with the language or region/country12. However, the timezone is not contained in the locale setting of the operating system. The timezone is a separate setting that determines the local time of the system based on the offset from the Coordinated Universal Time (UTC) and the daylight saving time (DST) rules. The timezone can be different from the country/region code in the locale setting, for example, a user can have a locale setting of en_US but a timezone of Asia/Kolkata. The timezone can be viewed and modified by using the date, timedatectl, or tzselect commands . References: 12
NEW QUESTION # 88
Which crontab entry could be used to set the system time at regular intervals?
- A. 1 0 * * * ntpdate ntp1.digex.net
- B. 1 0 * * * date ntp1.digex.net
- C. 1 0 * * * runcron date ntp1.digex.net
- D. 1 0 * * * settime $d $t $24
- E. 1 0 * * * date $d $t $24
Answer: A
Explanation:
The crontab entry that could be used to set the system time at regular intervals is the one that uses the ntpdate command to synchronize the system clock with a Network Time Protocol (NTP) server. The ntpdate command takes one or more NTP server names or IP addresses as arguments and adjusts the system clock accordingly12. The crontab entry B specifies that the ntpdate command should be executed at the first minute of the zeroth hour (i.e., 00:01) of every day of every month of every weekday, using the NTP server ntp1.digex.net34. This will ensure that the system time is updated daily with a reliable source.
The other crontab entries are either invalid or ineffective for setting the system time at regular intervals. The date command can be used to display or set the system date and time, but it requires a specific format for the argument, not an NTP server name5. The runcron and settime commands are not standard Linux commands and their functionality is unknown. The $d, $t, and $24 variables are also undefined and meaningless in this context.
References: 1: Linux At, Batch, Atq, Atrm Command Help and Examples - Computer Hope 2: How to set a cron job to run at a exact time? - Stack Overflow 3: 107.2 Lesson 1 - Linux Professional Institute Certification Programs 4: How to setup a crontab to execute at specific time - Stack Overflow 5: Writing a specific format of time in a text file every minute using ... - Ask Ubuntu
NEW QUESTION # 89
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.)
Answer:
Explanation:
netstat
NEW QUESTION # 90
What is the command to delete the default gateway from the system IP routing table? (Choose TWO correct answers.)
- A. netstat -r default
- B. ifconfig unset default
- C. route del default
- D. ip route del default
- E. sysctl ipv4.default_gw=0
Answer: C,D
Explanation:
The command to delete the default gateway from the system IP routing table is either route del default or ip route del default. Both commands will remove the default route that matches the specified parameters.
The route command is the older and more widely supported tool, while the ip command is the newer and more powerful tool that can manipulate various aspects of the network configuration. The other options are either invalid or do not affect the default gateway. References:
* 1: How to Remove Default Gateways via ip | Baeldung on Linux
* 2: How to remove all default gateways - Unix & Linux Stack Exchange
* 4: How to Add or Change the Default Gateway in Linux: 9 Steps - wikiHow
NEW QUESTION # 91
To prevent a specific user from scheduling tasks with at, what should the administrator do?
- A. Add the specific user to [deny] section in the /etc/atd.conf file.
- B. Add the specific user to nojobs group.
- C. Add the specific user to /etc/at.deny file.
- D. Run the following: atd --deny [user].
- E. Add the specific user to /etc/at.allow file.
Answer: C
NEW QUESTION # 92
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