Exam 14: Troubleshooting, Performance, and Security

Which command can be used to see what network services are running on your network?

What methods can be used to physically secure local computers?

What option can be specified with the rpm command to identify any missing files in a package or package dependency?

How can you identify filesystem corruption? How should you troubleshoot filesystem corruption on a non-critical partition?

​What are the two most common technologies that provide asymmetric encryption on Linux systems?

If applications run into difficulties gaining resources during execution and stop functioning, restarting the process using a specific kill signal may resolve the issue. Select the proper kill signal below:

What is the most common hardware component to fail on a Linux system?

Running background processes using what command allows you to exit your command-line shell without ending any background processes?

Older hardware that is malfunctioning may begin to send large amounts of information to the CPU when not in use. What is this process called?​

What are the two golden rules that should guide you during any troubleshooting process? Describe each rule.

What command can be used to change the maximum number of file handles that can be used by a program?​

​If X Windows fails to start, what command can be used to troubleshoot the issue?

​Match each term with the correct statement below. a.​baseline b.buffer overrun​ c.​file handles d.​firewall daemon (firewalld) e.​Intrusion Detection System (IDS) f.​lsof command g.​nmap command h.​SSH agent i.​tunneling j.tripwire -A daemon used on some Linux systems to provide for easier configuration of netfilter via the ipchains command.​

Which sar command option is used to display statistics for the processor queue?

​Match each term with the correct statement below. a.​baseline b.buffer overrun​ c.​file handles d.​firewall daemon (firewalld) e.​Intrusion Detection System (IDS) f.​lsof command g.​nmap command h.​SSH agent i.​tunneling j.tripwire -A common IDS for Linux that monitors files and directories.​

​Match each term with the correct statement below. a.​baseline b.buffer overrun​ c.​file handles d.​firewall daemon (firewalld) e.​Intrusion Detection System (IDS) f.​lsof command g.​nmap command h.​SSH agent i.​tunneling j.tripwire -​A command that lists the files that are currently being viewed or modified by software programs and users.

How can netfilter/iptables be used to create a firewall service?

​Asymmetric encryption uses a pair of keys that are unique generated on each system. What are these two keys called?

If network services that are started by inetd or xinetd are in use, what can be used to provide extra security?

​Match each term with the correct statement below. a.​baseline b.buffer overrun​ c.​file handles d.​firewall daemon (firewalld) e.​Intrusion Detection System (IDS) f.​lsof command g.​nmap command h.​SSH agent i.​tunneling j.tripwire -​A program that can be used to detect unauthorized access to a Linux system.