CompTIA Linux+ Exam Post-Assessment
What two functionally equivalent items consist of a table of all partition information for a certain hard disk or SSD and is stored in the first readable sector outside all partitions? Master Boot Record (MBR) GUID Partition Table (GPT) Primary Partition List (PPT) File Allocation Table (FAT)
Master Boot Record (MBR) GUID Partition Table (GPT)
What two statements regarding hard disk quotas in Linux are accurate? Quotas can be enabled at boot time using the /etc/fstab file. Hard limits are hard disk quotas that the user can't exceed for a certain period of time (5 days by default). Soft limits are hard disk quotas that the user can exceed for a certain period of time (7 days by default) Once turned on, quotas can't be disabled or turned off.
Quotas can be enabled at boot time using the /etc/fstab file. Soft limits are hard disk quotas that the user can exceed for a certain period of time (7 days by default)
A web developer is asking you what SQL command should be used in order to show all records in the "products" table and any corresponding matches within the "orders" table, utilizing the common field name of "item_num". What SQL command will work? SELECT * FROM products WHERE products.item_num = (LEFT OUTER JOIN orders.item_num); SELECT * FROM orders LEFT OUTER JOIN orders ON orders.item_num = products.item_num; SELECT * FROM products INNER JOIN orders ON orders.item_num = products.item_num; SELECT * FROM products LEFT OUTER JOIN orders ON products.item_num = orders.item_num;
SELECT * FROM products LEFT OUTER JOIN orders ON products.item_num = orders.item_num;
What stage of the GRUB boot loader is responsible for loading filesystem support prior to the displaying the graphical boot loader screen? Stage1.5 Stage2 Stage1 Stage3
Stage1.5
You have added the $PATH variable to ~/.bash_profile, but discover after logging in that your settings do not reflect what you configured in the file. What explanation is most likely the cause? You don't have permissions to one of the folders you added in the $PATH variable. The $PATH variable is defined in the ~/.profile file. One of the folders in $PATH does not exist. Non-root users cannot modify their own $PATH variable.
The $PATH variable is defined in the ~/.profile file.
Your network's stated password policy has changed, and you now need to configure your system to require a minimum password length of 10 characters. What must be done to accomplish this task? The /etc/passwd file must have the minimum password field changed for all users. You must use the systemctl set passlength command. The /etc/login.defs file's PASS_MIN_LEN parameter must be modified. You must modify the login.conf file under the /etc/pam.d directory to require a password of sufficient length.
The /etc/login.defs file's PASS_MIN_LEN parameter must be modified.
A user is complaining that their keyboard is registering duplicate key presses. What accessibility feature can correct this issue? Fast Keys Bounce Keys Sticky Keys Slow Keys
Bounce Keys
You are coaching a new junior administrator on managing user accounts, and she has asked you how to lock a user account on the system. What are valid ways to perform this task? Change the user's shell using chsh -s /bin/false username to lock the account. Place a "!" in front of the relevant user in the /etc/shadow file. Use the usermod -L username command. Use the lock username command.
Change the user's shell using chsh -s /bin/false username to lock the account. Place a "!" in front of the relevant user in the /etc/shadow file. Use the usermod -L username command.
You are reading through the /etc/crontab file and find the following entry: "*/5 * 1 * 5 /bin/myscript1" What does this entry do? It runs the /bin/myscript1 file five times every fifth day in January. It runs the /bin/myscript1 file every 5 minutes on Monday during the month of May. It runs the /bin/myscript1 file every 5 minutes on the first of the month, provided that day is a Friday. It runs the /bin/myscript1 file every 5 days at 1 am for 5 minutes.
It runs the /bin/myscript1 file every 5 minutes on the first of the month, provided that day is a Friday.
What command can you use to quickly strip comment lines beginning with a # from the file config_file? egrep "{-#}" -f config_file grep "^#" -f config_file cat config_file | sed s/$#//g cat config_file | sed /^#/d
cat config_file | sed /^#/d
You are processing a comma separated value file named file1.csv and wish to print only the 3rd and 4th field entries on each line. What command should you use? egrep '{,}' | echo $3 $4 cat file1.csv | awk -F , '{ print $3, $4 }' grep "(*),(*)" -e $3 $4 file1.csv cat file1.csv | awk -f ',' { print $3 $4 }
cat file1.csv | awk -F , '{ print $3, $4 }'
You wish to change the password expiry settings for the user "sarahj" such that the user must wait 5 days after setting a password to change passwords again, and also to specify that her password expires every 90 days with 7 days prior warning. What command can you use? chage -m 5 -M 90 -W 7 sarahj chage -m 90 -M 5 -w 7 sarahj chage -m 90 -M 5 -W 7 sarahj chage -m 5 -M 90 -w 7 sarahj
chage -m 5 -M 90 -W 7 sarahj
You have been asked to add a route to the 10.1.0.0/16 network via a gateway on the local network, 192.168.5.254. What command will add this route to the routing table? ip route add -net 10.1.0.0 netmask 255.255.255.0 gw 192.168.5.254 ip route add 10.1.0.0/16 via 192.168.5.254 route -add net 10.1.0.0 mask 255.255.0.0 192.168.5.254 route add 10.1.0.0/16 192.168.5.254
ip route add 10.1.0.0/16 via 192.168.5.254
After enabling sshd, you find that you are unable to reach the server remotely. The iptables -L command shows that there is no entry allowing ssh access. What command will insert a rule in the INPUT chain using a stateful filter? iptables -c INPUT --state ESTABLISHED --dport 22 iptables -a INPUT --service sshd iptables -I INPUT -m state --state ESTABLISHED --dport 22 -j ACCEPT iptables -A INPUT -m state --state NEW --dport 22 -j ACCEPT
iptables -A INPUT -m state --state NEW --dport 22 -j ACCEPT
During the execution of a compiled program named "prog1", several error messages are printed to the screen indicating that required shared libraries are missing. What command can you use to check which shared libraries are required by prog1? ldconfig prog1 ls -s /lib | grep "prog1" grep prog1 /etc/ld.so.conf ldd prog1
ldd prog1
What command will create a soft link of the file "script1" in your home directory and place it into the /usr/bin directory? ln ~/script1 /usr/bin/script1 ln -s ~/script1 /usr/bin/script1 ln -s /usr/bin/script1 ~/script1 ln /usr/bin/script1 ~/script1
ln -s ~/script1 /usr/bin/script1
When using LPD, what two commands can be used in conjunction to find print job IDs and cancel them? lpq lprm lpstat lpdel
lpq lprm
What command can you use to find out what printer is set as the default destination printer for the lp command? lp -a lpd -d lpstat lpq --show-default
lpstat
A network card on your server is not starting during boot, requiring the module for the card to be loaded after startup. What command can you use to verify the kernel module used by the card on the currently running system? modprobe -l lshw -C network ifconfig -a insmod -l
lshw -C network
What command can be used to view all connected USB devices detected by the Linux kernel? lsusb cat /proc/usb lspci lsmod
lsusb
You have just finished creating the partition /dev/sda1, now you want to put an ext3 filesystem onto it. What two commands could you use to do this? mkfs.ext3 /dev/sda1 makefs -t ext3 /dev/sda1 mke2fs -t ext3 /dev/sda1 parted -f ext3 /dev/sda1
mkfs.ext3 /dev/sda1 mke2fs -t ext3 /dev/sda1
You need to reboot your server after updating your installed kernel packages. What two commands will reboot the server immediately? shutdown -h now reboot reload shutdown -r now
reboot shutdown -r now
Your development server is experiencing heavy load conditions. Upon investigating, you discover a single program using PID 9563 consuming more resources than other programs on the server, with a nice value of 0. What command can you use to reduce the priority of the process? nice -n -20 9563 nice -p 9563 100 renice 9563 127 renice +15 9563
renice +15 9563
You need to gather information on quota usage by all users on the /shares folder. What command should you use? edquota -l /shares quota -ul /shares repquota /shares quota -ls /shares
repquota /shares
What two commands can be used to display the route table? route ifconfig -r ip show routes netstat -r
route netstat -r
What RPM command can be used to list the full paths for files within the bash package? rpm --query -l bash rpm -f --dump bash rpm -q --list-full bash rpm -l bash
rpm --query -l bash
After writing a large config file for a service, you discover that the hostname in the config file is incorrect in several places. What command can you use to ensure that all incorrect instances of hostname "host1" are changed to "host2"? cat config_file | sed s/host1/host2 < new_config pr -d new_config | tr host1 host2 < config_file sed s/host1/host2/g < config_file | tee new_config awk -f config_file {/host1/host2/} > config_file
sed s/host1/host2/g < config_file | tee new_config
Where is information regarding the number of inodes and data blocks available, as well as their sizes, stored? block table superblock first empty sector of the partition inode table
superblock
What command can be used to view the contents of a gzipped tar file named archive.tar.gz? zcat -t archive.tar.gz | tar -vf tar -zcvf archive.tar.gz bzcat archive.tar.gz | tar -t tar -ztvf archive.tar.gz
tar -ztvf archive.tar.gz
A new user in your company must be added to the "developers" group on your server. What command will add the user "jsmith" to this group? groupmod -a dev jsmith usermod --groups jsmith dev usermod -G dev jsmith groupadd -g dev jsmith
usermod -G dev jsmith
You are troubleshooting a department web server used for development that is experiencing heavy loads. What command can be used to determine who is logged in, and what their current running tasks are? luser who w last
w
A host with an odd FQDN has been attempting to log into your ssh servers, what command can you use to determine registration information for the FQDN? nslookup dig whois netstat
whois
You want to include the date inside of your shell's prompt. What shell variable represents how the prompt is displayed? $PS1 $HOME $PROMPT $SHELL
$PS1
You have been instructed to install the GRUB boot manager, and to create a boot entry that points to the second partition on the second hard drive in the system. What should you specify as the root? (hd2,2) (hd1,1) (hd0,0) (hd2,1)
(hd1,1)
What would the CIDR notation be for a Class A network that has been subnetted to allow for 1022 usable host addresses on each subnet? /16 /24 /22 /20
/22
What subnet mask will provide you with a max of 510 usable host addresses? 255.255.252.0 255.255.254.0 255.255.255.0 255.255.248.0
255.255.254.0
Your supervisor has asked you to configure a server with a RAID utilizing disk striping with two sets of parity bits for additional fault tolerance, so that up to two hard disk failures can occur without data loss. What type of RAID is your supervisor describing? RAID6 RAID5 RAID1 RAID3
RAID6
What two asymmetric algorithms are used by SSH to secure traffic between computers? Rivest Shamir Adleman (RSA) Digital Signature Algorithm Advanced Encryption Standard ARCFOUR
Rivest Shamir Adleman (RSA) Digital Signature Algorithm
After setting a variable named VAR1, a script complains that the variable doesn't exist. How can you ensure that this variable is available for subshells? Use the "env $VAR1" command. Run the command "export $VAR1". Add the $VAR1 variable as a flag for the script. Add the variable to a config file in the /etc directory.
Run the command "export $VAR1".
What hardware devices would typically be represented by block device files in the /dev directory? SCSI/SATA hard disk drive SCSI tape drive PS/2 mouse PATA hard disk drive floppy drive
SCSI/SATA hard disk drive PATA hard disk drive floppy drive
After editing a configuration file for a daemon running on your system, you want to restart the daemon while maintaining the same PID. What kill signal should you use? SIGINT SIGTERM SIGHUP SIGQUIT
SIGHUP
What are the two versions of the X Windows system that are commonly available on Linux platforms? Cocoa XFree86 X.org NeXT
X.org and NeXT
What filesystem, still in development, is envisioned to be a replacement for ext4 and ReiserFS in the long term? xfs ntfs bfs btrfs
btrfs
What command will take you to the testing directory within your home directory, regardless of where your home directory is? cd ~/testing echo $HOME | cd testing cd ./testing cd $homedir/testing
cd ~/testing
You have just configured your DNS client settings and need to test DNS resolution. What commands can you use? ifconfig nslookup netstat host dig
nslookup, host, and dig
A server is being retired and you need to dump all postgresql databases to a file for migration to another server. What command should be used to export all databases? dump_pg psql -d ALL dumpdb pg_dump
pg_dump
What commands can be used to view process information on a system? pstree ls /proc taskmgr vmstat ps
pstree ls /proc ps
What two items are used by asymmetric encryption algorithms to encrypt and decrypt data? public key a secret password private key pre-shared key
public key and private key
After receiving a call from several users in your network, you discover that none of your workstations can communicate with computers in your company's branch office. What command can you use to view the path through the network? route traceroute netstat ping
traceroute
You need to install an RPM without processing the RPM's dependencies, due to an issue with the RPM's install. What two flags must be used to accomplish the install? --force -i --bypass-deps --nodeps
-i and --nodeps
After failing to successfully mount the /dev/sda3 partition, you discover that the partition ID is incorrectly set to "7". What should the partition ID be for a standard Linux partition? 83 88 82 f0
82
Users are complaining that your mail server is not responding to IMAP account access requests. In troubleshooting the issue, you have issued the netstat -ltn command. What ports should you be looking for? 993 995 143 110
995 and 143
In the vi program, what command mode command will display all vi environment settings? :print var :set all :set env :env print
:set all
A system on your network has been found to contain only an /etc/passwd file for managing user accounts and passwords. You have been tasked with securing this system. What should you do? Change the permissions on the /etc/passwd so that only root has any access to the file, all other accounts / groups should not be able to read the file. Move the /etc/passwd file to a secured directory, then create a hard link to the file in /etc. Use the pwconv command to configure the system to use an /etc/shadow file for secured passwords. Force all the user accounts on the system to immediately change their passwords after editing the account security options in the /etc/login.defs file.
Change the permissions on the /etc/passwd so that only root has any access to the file, all other accounts / groups should not be able to read the file.
A new user has been hired to replace the retired user mikef. You have been tasked with giving the new user access to resources on a file sharing server with multiple file directories owned by mikef. What is the simplest way to ensure this new user's account has access to these files? Edit the /etc/passwd and /etc/shadow files to change mikef to the new user's login ID. Add the new user to the mikef group in /etc/groups. Perform a chown username:username -R on mikef's old /home directory. Create the new user and specify mikef's UID utilizing the useradd -u <UID> <newuser> command.
Create the new user and specify mikef's UID utilizing the useradd -u <UID> <newuser> command.
You are testing your configuration of postfix by telnetting to your postfix server. What command should you pass to the server to test ESMTP support? HELO EXHELO HELO EXTENDED EHLO
EHLO
Your supervisor has asked that you generate a report on your system utilizing a script file named /bin/report.pl at 11:00 pm on October 1st, 2016. You are required to set up a scheduled job for this report that will only occur once. How should this be done? Use the at 22001012016 command, and specify the /bin/report.pl file. Enter the command at 10:00pm October 1, and then specify the /bin/report.pl file. Add the following line to the /etc/crontab file: 0 22 1 10 * 2016 /bin/report.pl Use the schedule command to add the file for a one time run to /etc/cron.d.
Enter the command at 10:00pm October 1, and then specify the /bin/report.pl file.
A system you are in charge of is experiencing a DNS resolution issue. You find that entries in the /etc/hosts file are functioning, but any FQDN not in the hosts file is failing. Using the nslookup command, you test resolution successfully to a name server in your resolv.conf file. What is most likely your issue? The named daemon is not running / unresponsive. The /etc/nsswitch.conf file is missing an entry for DNS. The server itself is not using a valid FQDN. The name servers are not configured for recursive resolution of queries.
The /etc/nsswitch.conf file is missing an entry for DNS.
What is the first task that occurs immediately after a computer is powered on? The BIOS determines what devices and operating systems to execute. The POST test is performed. The operating system kernel is loaded into memory, and the system is initialized. The boot loader instructs the system as to which drive and partition the operating system should be booted from.
The POST test is performed.
You have modified the /etc/aliases file, but your postfix service is not routing mail for the new alias. You have verified the configuration in /etc/aliases, but the new aliases are still not functioning. What is most likely the problem? There is not a correspondingly named user for the alias. The newaliases command has not been run. The postfix service must be restarted after the aliases file is changed, to read in the new aliases. Permissions on the aliases file are incorrect.
The newaliases command has not been run.
After performing an ls -l in your current directory, you come across a file with a mode of "-rw-rw-r--+". What does the + indicate? The file is monitored by SELINUX in strict mode. The sticky bit is set on the directory and this file has inherited permissions. There is versioning control enabled on the file, such as with SVN or git. There is an ACL on the file that can be viewed with the getfacl command.
There is an ACL on the file that can be viewed with the getfacl command.
What are two ways you can permanently set the hostname on a system? Edit the /etc/sysconfig/hostname file Use the hostnamectl command Edit the /etc/hostname file Use the hostname command
Use the hostnamectl command Edit the /etc/hostname file
You are configuring a VPN server for remote access clients, and one of the requirements of the VPN software is that the server must perform IPv4 forwarding. How is this enabled? You must edit the /proc/sys/net/ipv4/ip_forward file and change the "0" to "1". You must edit the /proc/sys/net/ipv4/conf/all/forwarding file and change the "0" to "1". IPv4 routing must be turned on under /etc/networking. You must enable the routed daemon in your system config.
You must edit the /proc/sys/net/ipv4/conf/all/forwarding file and change the "0" to "1".
A user is reporting to you that they are unable to run a script named script1 within their home directory. The user has ownership of the file, and the modes on the file are "-rwxrw-rw-". What two commands could be used to set only the permissions necessary for the user to run the script? chmod a+wx script1 chmod 765 script1 chown user:user script1 chmod u+x script1
chmod 765 script1 chmod u+x script1
What command will copy the directory proj_files and all sub directories and files from /mnt/volume/proj_files to your home directory? cp -a /mnt/volume/proj_files ~/ cp -R /mnt/volume/proj_files ~/ cat /mnt/volume/proj_files ~/ mv /mnt/volume/proj_files ~/
cp -R /mnt/volume/proj_files ~/
What CUPS commands utilize the -r flag to specify a reason for an action being performed on a printer? cupsaccept cupsenable cupsqueue cupsdisable
cupsaccept cupsqueue cupsdisable
What command can be issued after system startup in order to view messages regarding hardware detected during boot? tail /var/log/boot.log cat /proc/hwinfo hwdump dmesg
dmesg
As part of a routine audit of your Debian server's filesystem, you are investigating a strange file named file1 that you suspect may have been installed by a package. What command should you execute to see what package provides the file, if any? dpkg -S file1 dpkg -l | grep file1 dpkg-query --find-file file1 dpkg-query --listfiles file1
dpkg -S file1
A junior administrator is studying the filesystem layouts on a server, and wishes to know how to display the total number of available inodes for an ext3 filesystem. What command should you give to the junior administrator? dumpe2fs -h <partition> head -n 512 <partition> extfs.info -v <partition> tune2fs -a <partition>
dumpe2fs -h <partition>
What format should be used in the rsyslog.conf to send logging information to another computer? priority.facility:hostname:portnumber facility.priority@hostname:portnumber facility,priority,hostname:portnumber hostname:portnumber,facility,priority
facility.priority@hostname:portnumber
What two commands will search for a desired string in a stream / output / file without interpreting regular expressions in the string? ngrep fgrep egrep -i grep -f
fgrep and grep -f
After an unexpected shutdown of the server, you need to run a filesystem integrity check on all entries of the /etc/fstab file with a 1 or 2 in the sixth field. What flag or flags can be used with fsck to do this automatically? fsck -A fsck -Va fsck -s fsck -Cf
fsck -A
After attempting to mount a partition, you get an error that the mount has failed because the filesystem is dirty. What command should you run to fix issues with the filesystem? fsck -f ext.fsck mke2fs clean
fsck -f
What command utilizes the Limpel-Ziv (LZ77) compression algorithm and achieves a compression ratio of 60-70 percent? bzip gzip compress bzcat
gzip
You have been asked to troubleshoot a legacy system running a critical component on your employer's network. Initial findings indicate that the system is failing to boot from the proper hard disk. According to documentation, the system should boot from the secondary master PATA hard disk. What is the name for this disk in Linux? sdb sda hda hdb
hdb
What two commands will display the first or last (respectively) 10 lines of a file when using default options? less tac head tail
head and tail
What command can be used to display user account IDs and group IDs for your currently logged in user account? whoami uname id groups
id
You are writing a script that requires a file named "include.txt". The script should not proceed if the file is not readable. How can this condition be tested? if [ ! -f include.txt ] case include.txt in ~/ test -f include.txt if [ ! -r include.txt ]
if [ ! -r include.txt ]
A server currently has a runaway process with a PID of 2600 that can't be halted by the standard kill signal. What two kill commands will force the Linux kernel to stop the process by routing the resources for the process to /dev/null? kill -SIGHALT 2600 kill -SIGKILL 2600 kill -9 2600 killall 2600
kill -SIGKILL 2600 kill -9 2600
A server is currently offline and requires a package that is currently stored in an iso file (image.iso) in your home directory. What command will mount this file to /mnt/image? mount -o loop -r -t iso9660 ~/image.iso /mnt/image isomount -r --lock ~/image.iso umount -o loop -r -t iso9660 ~/image.iso /mnt/image mount -t iso9660 ~/image.iso /mnt/image
mount -o loop -r -t iso9660 ~/image.iso /mnt/image
You are scheduling a script named script1 that will be run automatically by the system, and want to redirect both Standard Output and Standard Error to the same filename for logging purposes. What command will properly perform this redirection to the file named script1.log? script1 >script1.log 2>script1.log script1 >script1.log | tee 2>script1.log script1 1&2>script1.log script1 >script1.log 2>&1
script1 >script1.log 2>&1
After booting up your workstation, gdm fails to start. There appears to be no issues with the config file. What command can you use to troubleshoot the issue? gdm -v xwininfo xtest xstart
xwininfo
You have placed a command into the /usr/local/bin directory, but when you enter the command, the shell complains that the command couldn't be found. What shell variable should be checked? $ENV $PS1 $PATH $comands
$PATH
You are utilizing an Ubuntu workstation and need to set a static IP address on your eth0 network interface. What file must be modified to configure the static IP? /etc/sysconfig/network-scripts/ifcfg-eth0 /etc/sysconfig/networking/ifcfg-eth0 /etc/network/interfaces /etc/network
/etc/network/interfaces
When configuring a PPP connection on Linux, where are passwords used for secure communications with an ISP stored? /etc/ppp/chap-secrets /etc/ppp/pap-secrets /etc/ppp/chap-shadow /etc/ppp/pap-shadow
/etc/ppp/chap-secrets
What two commands can you use within to list available databases and list the tables within the current database, respectively? \l \a \d \t
/l and /t
A program is complaining that several C header files are missing. What directory should you look in to verify they're missing? /usr/local/lib /usr/include /usr/local/lib/include /usr/lib
/usr/include
While traveling internationally, you discover that although you are set to obtain time from the Internet, your time zone is currently set wrong. Where can you find a listing of available time zones that can be set using the tzselect command? /usr/share/zoneinfo /etc/zoneinfo /usr/local/timezone /etc/tzinfo
/usr/share/zoneinfo
A junior administrator mistakenly changed the home directory for the Postgresql user to /home/postgresql. What should this user's home directory be set to? /var/lib/postgresql /etc/postgresql /var/spool/postgresql /usr/local/sql
/var/lib/postgresql
As part of a routine security audit, you are required to check server log files for failed attempted logins using the sshd process. What log file should contain this information? /var/log/wtmp /var/log/dmesg /var/log/lastlog /var/log/secure
/var/log/secure
What two regular expressions are extended expressions and require the use of the egrep command? ? * $ (match1|match2)
? and (match1|match2)
A user on your network is complaining that they are unable to login, and that they receive a message saying that their shell is invalid. How can this issue be resolved? Find the user's shell binary and run chmod a+rwx on the binary. Add the user's configured shell to /etc/shells Reinstall the package for the bash shell, as it has become corrupted. Edit the /etc/passwd file and change their shell to a valid shell within the relevant field. Use the usermod -s command in conjunction with the login ID and specify a new shell for the user. Use the chsh command, followed by the user's login in order to change to a legitimate shell.
Edit the /etc/passwd file and change their shell to a valid shell within the relevant field. Use the usermod -s command in conjunction with the login ID and specify a new shell for the user. Use the chsh command, followed by the user's login in order to change to a legitimate shell.
A service configured to run at runlevels 2-5 is crashing your server upon startup. How can the server be put into runlevel 1 utilizing LILO or GRUB? In the GRUB/GRUB2 configuration screen, append "runlevel=1" to the root line, and then proceed to boot the system. At the LILO boot: prompt, type "root" and press enter to boot the system into runlevel 1. In the GRUB/GRUB2 configuration screen, append the word "single" to the kernel line, and then proceed to boot the system. At the LILO boot: prompt, type "1" and press enter to boot the system into runlevel 1.
In the GRUB/GRUB2 configuration screen, append the word "single" to the kernel line, and then proceed to boot the system. At the LILO boot: prompt, type "1" and press enter to boot the system into runlevel 1.
What statement accurately describes the Advanced Encryption Standard (AES)? It encrypts blocks of data in three stages using a 168-bit key length. It is an encryption standard that uses keys that are 448 bits in length. It is a fast encryption standard that operates on streams of data instead of blocks of data and uses variable length keys up to 2048 bits in length. It is an improvement on the 3DES encryption method and is available in 128, 192, and 256 bit key lengths.
It is an improvement on the 3DES encryption method and is available in 128, 192, and 256 bit key lengths.
What statement accurately describes the LXDE window manager? It is based on the Compiz and Beryl window managers and utilizes 3D acceleration on modern graphics cards to produce 3D graphical effects. It is designed specifically for underpowered systems such as netbooks, mobile devices, and legacy computers. It is a configurable window manager that allows for multiple desktops with different settings. It is the default window manager utilized by GNOME 3.
It is designed specifically for underpowered systems such as netbooks, mobile devices, and legacy computers.
You have just added several NTP servers to your /etc/ntp.conf, but after starting the NTP daemon, your system clock is still several hours off the correct local time, despite having the correct time zone set. What should be done to solve the issue? Edit the /etc/ntp.conf and set the jitter buffer value to 0, to allow synchronization with any server. Use the ntpq command to check what time is being reported by the ntp servers, copy this value, and then set the time using the date command. The system must be rebooted in order for the system kernel to recognize ntpd as synchronized with the NTP servers. The NTP daemon should be stopped, and the ntpdate command should be used to manually synchronize the time with an NTP server.
The NTP daemon should be stopped, and the ntpdate command should be used to manually synchronize the time with an NTP server.
What does a "Z" in the "S" column of ps command indicate? The indicated process is currently in the running state. The process has finished executing, and is waiting for the parent process to release its PID. The process is being traced by another process in the running state. The process has finished executing, and has released its PID.
The process has finished executing, and is waiting for the parent process to release its PID.
You are having issues on a Linux server with network connectivity. After exhausting all utilities at your disposal, you attempt to ping 127.0.0.1, and the pings fail. What can you determine from this result? There are no routes in the route table for reaching hosts on the local network. The iptables firewall is blocking access to the network. There is a critical issue with the TCP/IP stack on the server. The network cable is unplugged from the server, or is disconnected from a patch panel in the network.
There is a critical issue with the TCP/IP stack on the server.
Given two numerical variables A & B, and two string variables C & D, what two different test statements should be used to test numeric equality and string equality, respectively? [ C = D ] [ A = B ] [ C -eq D ] [ A -eq B ]
[ C = D ] [ A -eq B ]
What two commands can you use to display scheduled job IDs on a system? atq at -l cron -l at --jobs
atq and at -l