DCOm 142 Linux Final Study ACTUAL UPDATED QUESTIONS AND CORRECT
ANSWERS
You want to test connectivity to tranquility.luna.edu by ping -c 11
sending 11 packets to see how many return. To do this,
you can type ______ tranquility.luna.edu.
True or false: The host program has been deprecated. False:
The host program is actively maintained; it's nslookup that has been deprecated.
True or false: WEP provides the highest available level of False:
Wi-Fi security 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.
Your network's hardware interface is called eth0. You eth0
want to bring up this interface via DHCP, so you type
dhclient ___ as root.
What type of information can netstat provide? 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 Answer: B
translates between IP addresses and hostnames?
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 Answer: D
network interface in Linux?
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, dig
nslookup, and _ _.
True or false: The -n option to traceroute causes it to False
display hostnames rather than IP addresses.
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 False
a way that ensures the mapping is identical on all
computers. 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 True
lrwxrwxrwx.
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 _____. umask
You've created a script, sensitive, and you want to be Answer: 700
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.)
What does the permission string -rwxrwx--- mean? 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.
ANSWERS
You want to test connectivity to tranquility.luna.edu by ping -c 11
sending 11 packets to see how many return. To do this,
you can type ______ tranquility.luna.edu.
True or false: The host program has been deprecated. False:
The host program is actively maintained; it's nslookup that has been deprecated.
True or false: WEP provides the highest available level of False:
Wi-Fi security 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.
Your network's hardware interface is called eth0. You eth0
want to bring up this interface via DHCP, so you type
dhclient ___ as root.
What type of information can netstat provide? 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 Answer: B
translates between IP addresses and hostnames?
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 Answer: D
network interface in Linux?
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, dig
nslookup, and _ _.
True or false: The -n option to traceroute causes it to False
display hostnames rather than IP addresses.
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 False
a way that ensures the mapping is identical on all
computers. 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 True
lrwxrwxrwx.
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 _____. umask
You've created a script, sensitive, and you want to be Answer: 700
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.)
What does the permission string -rwxrwx--- mean? 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.
