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?

An administrator is attempting to block SSH connections to 192.168.10.24 using the Linux firewall. After implementing a rule, a connection refused error is displayed when attempting to SSH to 192.168.10.24.
Which of the following rules was MOST likely implemented?

All users are reporting that they cannot connect to the SFTP server. The administrator runs a scan:

Which of the following would allow the administrator to fix the problem?

An administrator wants to know the amount of memory installed on a Linux server. Which of the following commands can be used to accomplish this task?

Using which of the following control mode commands is the correct way to substitute all occurrences of /dev/ sdc with /dev/sdd while editing a file in vi?