The "dmesg" command prints the kernel ring buffer. You can look for the path assigned to the disk by the kernel in the kernel ring buffer. The /var/log/usb/latest file is not a standard log location. The "lsusb" command displays information about USB buses and USB devices, but it does not display device paths. For example, it does not display that a given device has the device path of /dev/sde. Device paths are controlled by Linux, not the device manufacturer.

The ping command uses the ICMP protocol's ECHO_REQUEST datagram to elicit an ICMP ECHO_RESPONSE from a host. The ICMP protocol does not use ports, making "Ports are not used by the ping command" the correct answer. Typically port 80 is for HTTP traffic, port 443 is used for HTTPS traffic, and port 22 is used for SSH traffic.

The "dig", "host", and "nslookup" commands all display the IP address(es) for a given domain, making "All of the above" the correct answer.

According to the FHS, the "/etc" hierarchy should contain configuration files. Given the choices, "/etc" is the most logical place to find configuration files for a web server.

The "route add default gw 10.20.30.1 eth1" command adds a default gateway of "10.20.30.1" to the "eth1" network interface, making it the correct answer. The "route add default gw 10.20.30.1" command sets the default gateway for all interfaces on the system, not just the "eth1" interface. The "ifup" command is used to bring up a network interface. The "ifup" command itself cannot be used to set the default gateway. Additionally, the "ifup eth1 dgw 10.23.30.1" command is not valid syntax. The "default-gw" command does not exist.

SELinux can be in the following states: enforcing, permissive, or disabled. When SELinux is in enforcing mode, SELinux policies are enforced and acted upon. When SELinux is permissive mode, Linux policies are not enforced, but actions that would have been denied if SELinux was in enforcing mode are logged. When SELinux is in the disabled state no SELinux policies are enforced and no SELinux logging occurs.

The "getfacl" command displays file access control lists, making it the correct answer. "setfacl" command alters file access control lists. The "lsattr" command lists file attributes, not ACL information. The "lsacl" command does not exist.

The "last" command shows a listing of the last logged in users, making it the correct answer. The "lastlog -u ubuntu" command displays the last time the "ubuntu" user logged into the system. The "who" command displays the users that are currently logged into the system.

The "/dev/null" file in Linux is a null device file. It discards anything written to it, and returns EOF upon reading it. Some people call "/dev/null" the "bit bucket" because sending output to "/dev/null" is like sending output directly to the trash, which is immediately emptied.

The proper combination of commands is "./configure && make && make install". The "./configure" command ensures your system meets the minimum requirements to compile the program and creates a "makefile". The "make" command compiles that application. "make install" places, or installs, the program binaries in the appropriate directories.