DCOM 142 LINUX FINAL QUESTIONS & ANSWERS
You want to test connectivity to tranquility.luna.edu by sending 11 packets to see how
many return. To do this, you can type __________ tranquility.luna.edu. - Answers -ping
-c 11
True or false: The host program has been deprecated. - Answers -False:
The host program is actively maintained; it's nslookup that has been deprecated.
True or false: WEP provides the highest available level of Wi-Fi security - Answers -
False:
WEP is in fact the worst of the three common levels of Wi-Fi security. WPA2 is the best,
with WPA in-between.
True or false: dhcpd is a common DHCP client for Linux. - Answers -
Your network's hardware interface is called eth0. You want to bring up this interface via
DHCP, so you type dhclient _____ as root. - Answers -eth0
What type of information can netstat provide? - Answers -Answer: A, B, C
netstat can provide information on network interfaces similar to what ifconfig provides
(option A), routing table data similar to what route provides (option B), and a list of open
ports (option C). It can not provide round-trip network packet travel time similar to what
ping provides (option D) or the identities of broken routers similar to what traceroute
provides (option E).
What term refers to the worldwide system of servers that translates between IP
addresses and hostnames? - Answers -Answer: B
The question describes the Domain Name System (DNS), so option B is correct. The
Dynamic Host Configuration Protocol (DHCP) delivers network configuration information
to computers when they boot, so option A is incorrect. The Transmission Control
Protocol/Internet Protocol (TCP/IP) is the overarching standard used for most
networking purposes, so option C is incorrect. IP version 6 (IPv6) is an addressing
system that supports immensely more addresses than does the older IPv4, so option D
is incorrect. The Secure Shell (SSH) is an encrypted remote login protocol, so option E
is incorrect.
What program can you use to manually bring up a network interface in Linux? -
Answers -Answer: D
,The ifconfig program does as the question specifies (among other things), so option D is
correct. The iwlist command displays information on Wi-Fi networks but does not bring
up a network interface, so option A is incorrect. The route command displays or
modifies routing tables, but does not bring up a network interface, so option B is
incorrect. The telnet command is a remote-access and network diagnostic tool, but it
does not bring up a network interface, so option C is incorrect. The traceroute command
produces network diagnostic information, but it does not bring up a network interface, so
option E is incorrect.
Programs that can look up DNS information include host, nslookup, and _____. -
Answers -dig
True or false: The -n option to traceroute causes it to display hostnames rather than IP
addresses. - Answers -False
The statement has it backwards; -n causes traceroute to display IP addresses rather
than its default of hostnames.
True or false: User ID numbers are linked to usernames in a way that ensures the
mapping is identical on all computers. - Answers -False
User ID numbers are assigned to usernames in an arbitrary way, so a given username
may have different user ID numbers on different computers.
True or false: Symbolic links always have permissions of lrwxrwxrwx. - Answers -True
The leading l identifies the file as a symbolic link. The remaining characters indicate that
all users have full access to the link file, but the linked-to file's permissions are what
control what users can actually do with the file.
Default permissions are determined by the _____. - Answers -umask
You've created a script, sensitive, and you want to be sure that no other ordinary user of
the computer can read, write, or execute it, but you must be able to read, write, and
execute it. To do so, you type chmod ______ sensitive. (Specify the octal mode.) -
Answers -Answer: 700
What does the permission string -rwxrwx--- mean? - Answers -C
Option C correctly summarizes the meaning of the specified permission string. The
description in option A would be represented by -rwx------, which is not the string shown
in the question. Option B would be correct if the string began with d, indicating a
directory; but the leading - indicates a data file rather than a directory. Option D's
description would require rwx in the last three characters of the permission string; but
the --- indicates no world access. Option E combines the directory error of option B with
the world-access error of option D, and so is incorrect.
, A file has a symbolic mode of -rw-r-----. The file's octal mode is _______. - Answers -
Answer: 640
The command _______ :users somefile.txt changes the group affiliation of somefile.txt
to users. - Answers -Answer: chown
Which of the following programs enable root to set the ownership of files? (Select all
that apply.) - Answers -Answer: B, D
command updates a file's time stamps, but does not change its ownership, so option E
is incorrect.touch command can change various account features, but not file
ownership, so option C is incorrect. The usermod command enables changing the mode
(permissions) of files, but not their ownership, so option A is incorrect. The chmod, it
enables you to change the ownership of files, so option D is also correct. The root
command is a text-mode tool for changing the ownership and group association of files,
so option B is correct. Nautilus is a GUI file manager, and when it's run as chownThe
You type the following command and see the resulting output:
$ ls -l test
-rwxr-xr-x 2 rod users 111 Apr 13 13:48 test
What is the meaning of the digit 2 immediately prior to the username (rod)? - Answers -
C
The number in the specified position represents the number of filenames that point to
the file—in other words, the number of hard links to the file. Thus, option C is correct.
Options A, B, D, and E all present fictitious descriptions of that field's meaning. (The
file's size appears later on the line—it's 111 in this example.)
Which of the following options to chown changes the ownership of all the subdirectories
of any specified directories, rather than just the files or directories that are explicitly
passed to it? - Answers -A
The -R or --recursive option does as the question specifies, so option A is correct. The -
-tree, -all, and -t options are all fictitious, so options B, D, and E are all incorrect. Option
C is almost correct, but the correct option includes two dashes, not one—that is, it's --
recursive, not -recursive.
The character that separates fields on each line of /etc/passwd is ___. - Answers -
Answer: :
True or false: Users should be logged in when you change their UID numbers with
usermod. - Answers -False
You want to test connectivity to tranquility.luna.edu by sending 11 packets to see how
many return. To do this, you can type __________ tranquility.luna.edu. - Answers -ping
-c 11
True or false: The host program has been deprecated. - Answers -False:
The host program is actively maintained; it's nslookup that has been deprecated.
True or false: WEP provides the highest available level of Wi-Fi security - Answers -
False:
WEP is in fact the worst of the three common levels of Wi-Fi security. WPA2 is the best,
with WPA in-between.
True or false: dhcpd is a common DHCP client for Linux. - Answers -
Your network's hardware interface is called eth0. You want to bring up this interface via
DHCP, so you type dhclient _____ as root. - Answers -eth0
What type of information can netstat provide? - Answers -Answer: A, B, C
netstat can provide information on network interfaces similar to what ifconfig provides
(option A), routing table data similar to what route provides (option B), and a list of open
ports (option C). It can not provide round-trip network packet travel time similar to what
ping provides (option D) or the identities of broken routers similar to what traceroute
provides (option E).
What term refers to the worldwide system of servers that translates between IP
addresses and hostnames? - Answers -Answer: B
The question describes the Domain Name System (DNS), so option B is correct. The
Dynamic Host Configuration Protocol (DHCP) delivers network configuration information
to computers when they boot, so option A is incorrect. The Transmission Control
Protocol/Internet Protocol (TCP/IP) is the overarching standard used for most
networking purposes, so option C is incorrect. IP version 6 (IPv6) is an addressing
system that supports immensely more addresses than does the older IPv4, so option D
is incorrect. The Secure Shell (SSH) is an encrypted remote login protocol, so option E
is incorrect.
What program can you use to manually bring up a network interface in Linux? -
Answers -Answer: D
,The ifconfig program does as the question specifies (among other things), so option D is
correct. The iwlist command displays information on Wi-Fi networks but does not bring
up a network interface, so option A is incorrect. The route command displays or
modifies routing tables, but does not bring up a network interface, so option B is
incorrect. The telnet command is a remote-access and network diagnostic tool, but it
does not bring up a network interface, so option C is incorrect. The traceroute command
produces network diagnostic information, but it does not bring up a network interface, so
option E is incorrect.
Programs that can look up DNS information include host, nslookup, and _____. -
Answers -dig
True or false: The -n option to traceroute causes it to display hostnames rather than IP
addresses. - Answers -False
The statement has it backwards; -n causes traceroute to display IP addresses rather
than its default of hostnames.
True or false: User ID numbers are linked to usernames in a way that ensures the
mapping is identical on all computers. - Answers -False
User ID numbers are assigned to usernames in an arbitrary way, so a given username
may have different user ID numbers on different computers.
True or false: Symbolic links always have permissions of lrwxrwxrwx. - Answers -True
The leading l identifies the file as a symbolic link. The remaining characters indicate that
all users have full access to the link file, but the linked-to file's permissions are what
control what users can actually do with the file.
Default permissions are determined by the _____. - Answers -umask
You've created a script, sensitive, and you want to be sure that no other ordinary user of
the computer can read, write, or execute it, but you must be able to read, write, and
execute it. To do so, you type chmod ______ sensitive. (Specify the octal mode.) -
Answers -Answer: 700
What does the permission string -rwxrwx--- mean? - Answers -C
Option C correctly summarizes the meaning of the specified permission string. The
description in option A would be represented by -rwx------, which is not the string shown
in the question. Option B would be correct if the string began with d, indicating a
directory; but the leading - indicates a data file rather than a directory. Option D's
description would require rwx in the last three characters of the permission string; but
the --- indicates no world access. Option E combines the directory error of option B with
the world-access error of option D, and so is incorrect.
, A file has a symbolic mode of -rw-r-----. The file's octal mode is _______. - Answers -
Answer: 640
The command _______ :users somefile.txt changes the group affiliation of somefile.txt
to users. - Answers -Answer: chown
Which of the following programs enable root to set the ownership of files? (Select all
that apply.) - Answers -Answer: B, D
command updates a file's time stamps, but does not change its ownership, so option E
is incorrect.touch command can change various account features, but not file
ownership, so option C is incorrect. The usermod command enables changing the mode
(permissions) of files, but not their ownership, so option A is incorrect. The chmod, it
enables you to change the ownership of files, so option D is also correct. The root
command is a text-mode tool for changing the ownership and group association of files,
so option B is correct. Nautilus is a GUI file manager, and when it's run as chownThe
You type the following command and see the resulting output:
$ ls -l test
-rwxr-xr-x 2 rod users 111 Apr 13 13:48 test
What is the meaning of the digit 2 immediately prior to the username (rod)? - Answers -
C
The number in the specified position represents the number of filenames that point to
the file—in other words, the number of hard links to the file. Thus, option C is correct.
Options A, B, D, and E all present fictitious descriptions of that field's meaning. (The
file's size appears later on the line—it's 111 in this example.)
Which of the following options to chown changes the ownership of all the subdirectories
of any specified directories, rather than just the files or directories that are explicitly
passed to it? - Answers -A
The -R or --recursive option does as the question specifies, so option A is correct. The -
-tree, -all, and -t options are all fictitious, so options B, D, and E are all incorrect. Option
C is almost correct, but the correct option includes two dashes, not one—that is, it's --
recursive, not -recursive.
The character that separates fields on each line of /etc/passwd is ___. - Answers -
Answer: :
True or false: Users should be logged in when you change their UID numbers with
usermod. - Answers -False
