A newly deployed application is not able to reach the database that is running on a Linux server. The connection should occur at port 1521/tcp from appsrv 192.168.1.11 to dbsrv 192.168.1.12.
A server administrator runs a few diagnostic commands with following results:

The same command when run from the application server gives the following result:

Both machines are in the same IP subnet, so no external network device is causing the issue.
Which of the following commands BEST solves the connectivity issue at the dbsrv machine? (Select TWO).

An administrator needs to generate a list of services that are listening on TCP and/or UDP ports. Which of the following tools should the administrator use?

A remote server reverts to the incorrect time when it is restarted. Which of the following will save the correct time to the BIOS clock once the time and date have been set on the server?

A Linux systems administrator is setting up SSH access with PKI for several using their newly created RSA keys. Which of the following MOST securely achieves this task?

A Linux administrator needs to schedule a cron job to run at 1:15 p.m. every Friday to report the amount of free disk space on the system and to send the output to a file named "freespace". Which of the following would meet this requirement?