Free 102-400 sample questions

Correct answer: Both options check the existence of the path. The -f option also confirms that it is a regular file.

The -e option tests for the existence of any path (file, directory, device, etc.), while the -f option specifically tests for the existence of a regular file. Option A correctly states that both check existence, but -f additionally confirms it is a regular file. Option B incorrectly claims -e tests for empty files (that would be -s for non-empty). Option C wrongly states -e tests for executable files (that would be -x). Option D is incorrect as they have different behaviors for directories and special files.

Correct answer: Without additional configuration, no users may have user specific crontabs.

When neither /etc/cron.allow nor /etc/cron.deny exist, the default behavior is to deny access to all users except root. This is a security measure where explicit permission must be granted through cron.allow for users to create crontabs. Option A is incorrect as no approval process exists. Option C is wrong as cron will start normally. Option D is incorrect as the default is restrictive, not permissive.

Correct answer: When configured correctly,-/.forwardcan be used to forward each incoming mail to more than one other recipient.

The ~/.forward file allows users to forward incoming mail to one or more recipients by listing email addresses, one per line. It can indeed forward to multiple recipients, making option B correct. Option A is incorrect as all users can configure their own .forward files. Option C is wrong as no newaliases command is needed for .forward files (that is for system-wide aliases). Option D is incorrect as users own and can edit their own .forward files.

Correct answer: *.*/dev/tty12

The correct syslog.conf entry to display all messages on console 12 is *.*/dev/tty12, where *.* means all facilities and all priorities, and /dev/tty12 is the device file for virtual terminal 12. Option A uses invalid pipe syntax for syslog. Option B only captures mail facility messages. Option C lacks the facility.priority selector. Option D is not a valid syslog entry format.

Correct answer: /etc/ssh/sshd_config

/etc/ssh/sshd_config is the main configuration file for the OpenSSH server daemon (sshd). This file contains server-specific settings like port numbers, authentication methods, and access controls. Option A and E are non-existent files. Option B is incomplete. Option C (/etc/ssh/ssh_config) is the client configuration file, not the server configuration.

Correct answers: route; netstat

The route command displays and manipulates the local routing table, showing destination networks, gateways, and interface information. Used with no arguments, it shows the current routing table. The netstat command with -r option also displays routing information. Other options are incorrect: trackroute is not a valid command, dig is for DNS queries, and ifconfig shows interface configuration but not routing tables.

The netstat command with the -r option displays the local routing table, showing routes, gateways, and network interfaces. It provides similar information to the route command but in a different format. The route command is the other correct answer. Other options are incorrect: trackroute is not a valid command, dig is for DNS queries, and ifconfig shows interface configuration but not routing tables.