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1. On which port does the ping command operate for Internet Control Message Protocol (ICMP) echo requests?
2. Which of the following commands shows various statistics for a network interface such as packets and bytes received and transmitted along with errors and other such conditions?
3. Which of the following configuration lines in /etc/hosts.deny creates a deny-by-default policy where clients will need to be specifically allowed in /etc/hosts.allow?
4. Which option to the ip command displays DNS names rather than merely IP addresses?
5. Which option to date changes the output to Coordinated Universal Time (UTC) regardless of the current time zone?
6. Within which directory hierarchy will you find information regarding the available time zones on the server?
7. Which command option can be used to remove all cron jobs for a given user using the crontab command?
8. Users can be added or removed for access to the X server. Which command facilitates this?
9. Which option to the logrotate command specifies the mailer to use?
10. Which of the following commands changes the group name from admins to serveradmins?
11. Which of the following commands can be used to delete a print job on a system that uses the lp print system?
12. Which of the following commands deletes a group from a CentOS Linux system?
13. Which of the following commands displays a listing of who is logged in to the server along with the date and time that they logged in?
14. Which of the following locations stores the configuration for LightDM?
15. Which command can be used to set the delay and repeat rate for a keyboard?
16. When viewing the results of a traceroute, you see !H. To what does !H refer?
17. You are watching another administrator perform some work on a server. As part of that work, the admin uses the following command: .var.sh Which of the following is the equivalent of .var.sh?
18. Which of the following shows a valid Bash function called greetings?
19. Which of the following syslog facilities captures messages from the lp printing facility?
20. Which of the following subnet masks represents a /23?
21. Which option to passwd can be used to unlock an account that was locked with the passwd command?
22. Which of the following commands sends an email to root with the subject of Update and the content of the /etc/hostname file?
23. Which port should be allowed through a firewall for NTP communication?
24. Which character combination sets the body of the message to STDIN when using the mail command?
25. Which of the following conditionals in a Bash script will test if the variable DAY is equal to SUNDAY?
26. The driftfile, as specified in /etc/ntp.conf on a Red Hat system, is stored in which location by default?
27. Which option to the ntpdate command configures the version to use such that an older Network Time Protocol (NTP) server could be queried?
28. Which option to ssh changes the username to use for logging in to the server?
29. Which of the following commands displays the current mail aliases known on the server?
30. Which of the following options to isof searches an entire directory tree for open instances of files or directories?
31. Which of the following commands and options enables you to examine timing related to listening sockets?
32. When deleting a user from the server, you need to maintain their home directory rather than deleting it. Which option of the following commands deletes the user <username> but preserves their home directory?
33. Which of the following is the correct syntax to connect using ssh to host. example. com on port 2200?
34. Which of the following IP address and subnet mask pairs represents a private network in a /24 size?
35. Which of the following commands is necessary for making a variable defined in your current shell available to child processes?
36. Which option to useradd sets the number of days between password expiration and when the account is disabled?
37. Which option in /etc/sudoers sets the destination address for administrative and security emails related to sudo?
38. Which option to ping disables name resolution?
39. Files that should be copied to a user’s home directory when their account is created should be placed in which of the following directories?
40. After deleting a group, you need to search the filesystem for files owned by the group using its group ID. Which option to the find command will search using the group ID?
41. To which file should you add an entry in order for a host to be blocked using TCP wrappers?
42. Which variable is used to indicate the screen on which GUI applications will be shown?
43. Which option to the crontab command enables you to work with a different user’s cron jobs?
44. Which of the following commands displays the available character maps?
45. Which of the following options to ifup tells the command to ignore errors and continue?
46. Which option to nmap causes it to scan using UDP?
47. Which of the following commands displays statistics and information about windows in X windows?
48. Within which directory are systemd journals stored by default?
49. Which of the following commands can be used to set the time zone on a Debian system?
50. Which of the following commands adds ~/dev/bin to the path?
51. Which of the following areas within an Ubuntu system contains information and settings for accessibility?
52. When using netstat -a, which file is consulted for the port number to name translation?
53. An entry in /etc/nsswitch.conf indicates hosts: files dns. In which order will /etc/hosts be queried for a hostname lookup?
54. Which port needs to be allowed through the firewall for standard Lightweight Directory Access Protocol (LDAP) traffic to be received by the server?
55. Which of the following commands creates an alias for the ps command such that the options auwx are included when the user types psa?
56. Which of the following commands launches Orca with speech capabilities?
57. Which of the following describes the result of running the atq command as root?
58. You need to specify an additional localhost address and hostname for a server in order to support a specialized network configuration. Which line in /etc/hosts sets the hostname with a unique IP address in the correct range for localhost?
59. When using the host command, which option displays the Start of Authority (SOA) record from each of the authoritative DNS name servers for the given domain?
60. Which command is used to parse log file entries on a systemd- based system?
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