Linux+ 10-13

Which command displays print jobs in the queue for printer1 only?

lpstat -o printer1 — The -o option displays jobs for a specific printer.

What command generates SSH keys for a user account?

ssh-keygen — Creates a public and private SSH key pair.

Which file stores DNS server IP addresses?

/etc/resolv.conf — Contains DNS resolver configuration.

Which command removes a package from an RPM-based system?

rpm -e — Erases an installed RPM package.

What protocol does CUPS use to share printers by default?

IPP — Internet Printing Protocol.

Which command checks missing shared libraries?

ldd — Displays required libraries and reports missing ones as not found.

What port does SSH use by default?

22 — SSH uses TCP port 22.

Which command deletes a user account and its home directory?

userdel -r username — Removes the account and associated home directory.

Which package managers install sandboxed applications?

Flatpak and Snap — Both manage sandboxed application formats.

What command displays TCP connections on Linux?

ss -t — Displays TCP connections using the iproute2 package.

Which command searches RPM repositories for packages?

dnf search packagename — Searches available RPM repositories.

What is the first field in /etc/passwd?

Username — The first field identifies the account name.

Which file controls hostname resolution methods and their order?

/etc/nsswitch.conf — Defines the order of name resolution sources.

What command creates an image backup of a partition?

dd — Copies data at the block level to create an image.

Which two environment variables set a user's default printer?

PRINTER and LPDEST — Either can be exported in ~/.bash_profile.

What is the loopback IP address?

127.0.0.1 — Refers to the local computer.

Which command compiles source code using a Makefile?

make — Reads the Makefile and runs the required compilation commands.

What command copies SSH public keys to a remote computer?

ssh-copy-id — Installs your public key on a remote system.

Which file stores the hostname on Linux?

/etc/hostname — Contains the system hostname.

Which command updates shared library configuration and cache?

ldconfig — Updates /etc/ld.so.conf and /etc/ld.so.cache information.

Which command sets the default printer for all users?

lpoptions -d printer1 — Sets the default printer.

What are two ways to resolve a hostname to an IP address?

DNS and /etc/hosts — DNS uses name servers; /etc/hosts provides manual mappings.

Which command lists files in an installed RPM package?

rpm -ql packagename — Queries and lists package files.

What command prevents a printer from accepting new print jobs and displays a reason?

cupsreject -r "Unavailable" printer5 — Rejects new jobs and provides a message.

Which two commands can modify the Linux routing table?

ip and route — Both can add, change, or delete routes.

What file configures the maximum size of the journald database?

/etc/systemd/journald.conf — Contains systemd journal configuration.

Which command verifies a SHA-256 checksum?

sha256sum — Calculates or checks SHA-256 hashes.

What is the default compression level used by gzip?

6 — gzip uses level -6 by default.

Which command displays DNS information for a hostname?

dig hostname — Queries DNS records.

Which command sets a default printer for an individual user?

export PRINTER=printer5 or export LPDEST=printer5 — Sets the user's default printer.

Which command lists Flatpak applications available from a remote repository?

flatpak remote-ls — Lists applications from configured remote repositories.

What command extracts a CPIO archive?

cpio -vicdu -I archive.cpio — The -i option extracts and -I specifies the input archive.

Which file stores Fedora NetworkManager connection profiles?

/etc/NetworkManager/system-connections/name.nmconnection — Stores persistent network configuration.

What command lists files contained in a Debian package?

dpkg -L packagename — Lists files belonging to a package.

Which two commands display TCP connections on Linux?

ss -t and netstat -t — ss uses iproute2; netstat uses net-tools.

Which command removes a Debian package and its configuration files?

apt purge packagename — Removes the package and its configuration files.

What command can test DNS resolution using systemd-resolved?

resolvectl query hostname — Queries the configured DNS resolver.

Which utility displays the compression ratio when using compress?

compress -v filename — Displays the percentage of compression reduction.

What command can install RPM packages from online repositories?

dnf or yum — Both can search repositories and install or upgrade RPM packages.

What does the -9 option do in gzip?

Provides maximum compression — Uses the highest compression level.

Which command displays a printer's queue using the lpstat utility?

lpstat -o printername — Shows jobs waiting for that printer.

Which command can install a sandboxed application from a Flatpak repository?

flatpak install — Installs Flatpak applications.

What does SSH provide that Telnet does not?

Encryption — SSH encrypts network traffic; Telnet sends traffic unencrypted.

What does the -v option do with the compress command?

Displays the compression ratio — Shows the percentage of file size reduction.

Which command lists missing libraries as not found?

ldd — Checks shared library dependencies.

What is the correct order for restoring a full backup and four incremental dump backups?

0, 1, 2, 3, 4 — Restore the full backup first, followed by incremental backups in order.

What command can configure NetworkManager from the terminal?

nmcli — Views and configures NetworkManager.

Which command configures systemd-networkd?

networkctl — Views and manages systemd-networkd.

Which protocol is used by CUPS for network printing?

IPP — Internet Printing Protocol.

What command deletes a Linux user account?

userdel username — Removes the user account.

What does the .xz extension indicate?

A file compressed using xz.

What does the .tar extension indicate?

A tar archive, commonly called a tarball.

Which command creates a tar archive on a tape device?

tar -cvf /dev/st0 * — Creates an archive on the tape device.

Which two tools manage RPM software repositories?

dnf and yum — Both manage RPM packages.

Which command searches for a package named oobla in RPM repositories?

dnf search oobla — Searches repository package names and descriptions.

Which command can run an AppImage file?

Grant execute permission with chmod +x sample.appimage, then run ./sample.appimage.

Where can third-party APT repository files be stored?

/etc/apt/sources.list.d — APT reads repository configuration files from this directory.

Which command installs source code after compilation?

make install — Installs the compiled program.

What command creates an archive using CPIO?

cpio — Creates and extracts archives; its operation depends on the selected options.

Which two methods provide graphical remote Linux administration?

VNC and ssh -X — VNC provides remote desktop access; ssh -X forwards graphical applications.

Which command can resolve a hostname to an IP address?

host hostname — Performs a DNS lookup.

Which configuration information allows a computer to send traffic to remote networks?

Default gateway — Identifies the router used to reach other networks.

What is the facility used for network login events in rsyslog?

authpriv — Used for authentication-related and security-sensitive messages.

What does the minus sign before a logfile mean in rsyslog.conf?

It enables delayed or buffered writing rather than immediately synchronizing every write. Important: the quiz explanation appears to reverse this behavior; without the minus sign, writes are synchronous.

Which rsyslog priority matches warnings and more serious events?

warn — Matches warning priority and more severe priorities when used without an equals sign.