The Ultimate Linux Commands And Networking Test
- 1.Which command is used to set the hostname of the local system? (Specify only the command without any path or parameters.)
- 2.Which of the following is a valid IPv6 address?
- A.
2001:db8:0g21::1
- B.
2001::db8:4581::1
- C.
2001:db8:3241::1
- D.
2001%db8%9990%%1
- E.
2001.db8.819f..1
- 3.What command, depending on its options, can display the open TCP connections, the routing tables, as well as network interface statistics? (Specify only the command without any path or parameters.)
- 4.Which command included in NetworkManager is a curses application which provides easy acces to the NetworkManager on the command line? (Specify only the command without any path or parameters.)
- 5.Which if the following tools, used for DNS debugging, reports not only the response from the name sever but also details about the query?
- A.
dnsq
- B.
hostname
- C.
dig
- D.
dnslookup
- E.
zoneinfo
- 6.Which of the following statements is valid in the file /etc/nsswitch.conf?
- A.
multi on
- B.
192.168.168.4 dns-server
- C.
namespaces: net mount procs
- D.
include /etc/nsswitch.d/
- E.
hosts: files dns
- 7.Which of the following connection types, as seen in nmcli connection show, may exist in NetworkManager? (Choose three.)
- A.
tcp
- B.
ethernet
- C.
wifi
- D.
ipv6
- E.
bridge
- 8.On a Linux workstation, the route command takes a long time before printing out the routing table. Which of the following errors does that indicate?
- A.
The local routing information may be corrupted and must be re-validated using a routing protocol.
- B.
One of the routers in the routing table is not available which causes the automatic router failure detection mechanism (ARF-D) to wait for a timeout.
- C.
There may accidentally be more than one default router in which case a default router election has to be done on the network in order to choose one router as the default.
- D.
The Linux Kernel Routing Daemon (LKRD) is not running and should be started using its init script or systemd unit.
- E.
DNS resolution may not be working as route by default tries to resolve names of routers and destinations and may run into a timeout.
- 9.What is true about the Hop Limit field in the IPv6 header?
- A.
The field is not changed during the transport of a package.
- B.
The field is transmitted within a hop-by-hop extension header.
- C.
Each router forwarding the packet increases the field’s value.
- D.
Each router forwarding the packet decreases the field’s value.
- E.
For multicast packages, the field’s value is always 1.
- 10.Which of the following nmcli subcommands exist? (Choose two.)
- A.
nmcli ethernet
- B.
nmcli device
- C.
nmcli wifi
- D.
nmcli address
- E.
nmcli connection
- 11.Which of the following changes may occur as a consequence of using the command ip? (Choose three.)
- A.
Network interfaces may become active or inactive.
- B.
New name servers may be added to the resolver configuration.
- C.
The system’s host name may change.
- D.
IP addresses may change.
- E.
The routing table may change.
- 12.How many IP addresses can be used for unique hosts inside the IPv4 subnet 192.168.2.128/26?
- A.
6
- B.
14
- C.
30
- D.
62
- E.
126
- 13.Which of the following IPv4 networks are reserved by IANA for private address assignment and private routing? (Choose three.)
- A.
10.0.0.0/8
- B.
127.0.0.0/8
- C.
169.255.0.0/16
- D.
172.16.0.0/12
- E.
192.168.0.0/16
- 14.Which of the following commands configure network interfaces based on the system’s existing distribution-specific configuration files? (Choose two.)
- A.
ifconf
- B.
ifdown
- C.
ifpause
- D.
ifstart
- E.
Ifup
- 15.Which of the following statements is true if the UID of a regular user is identical to the GID of a group?
- A.
UID have precedence over GIDs, therefore the user is available while the group doesn’t.
- B.
The user as well as the group are not available to avoid ambiguity due to the ID conflict.
- C.
UIDs and GIDs are independent of each other, therefore the user as well as the group are still available.
- D.
The user is the only member of the group, even if the group configuration contains other members.
- E.
GIDs have precedence over UIDs, therefore the group is available while the user isn’t.
- 16.Which of the following information is stored in /etc/shadowfor each user?
- A.
The timestamp of the user’s last login
- B.
The user’s private SSH keys
- C.
The hashed password of the user
- D.
The numerical user ID (UID)
- E.
The path to the user’s home directory
- 17.Which of the following commands shows all active systemd timers?
- A.
systemctl-timer show
- B.
timectl list
- C.
systemctl –t
- D.
systemctl list-timers
- E.
timeq
- 18.Which of the following tasks can the date command accomplish? (Choose two.)
- A.
Set the system’s date and time.
- B.
Set the system’s date but not the time.
- C.
Calculate the time span between two dates.
- D.
Print a calendar for a month or a year.
- E.
Display time in a specific format.
- 19.Which file, if present, must contain all users that are allowed to use the cron scheduling system? (Specify the full name of the file, including path.)
- 20.What can be specified with useradd? (Choose two.)
- A.
Commands the user can run using sudo.
- B.
The absolute path to the user’s home directory.
- C.
Which printers are available for the new user.
- D.
The SSH keys used to login to the new account.
- E.
The numeric user ID (UID) of the user.
- 21.What is true about the file /etc/localtime?
- A.
It is a plain text file containing a string such as Europe/Berlin
- B.
It is created and maintained by the NTP service based on the location of the system’s IP address.
- C.
It is a symlink to /sys/device/clock/ltime and always contains the current local time.
- D.
After changing this file, newtzconfighas to be run to make the changes effective.
- E.
It is either a symlink to or a copy of a timezone information file such as /usr/share/zoneinfo/Europe/Berlin.
- 22.Which of the following statements is true regarding systemd timer units?
- A.
Timer units can only be defined within a service unit’s file.
- B.
The command executed by the timer is specified in the timer unit’s [Cmd] section.
- C.
A dedicated system service, systemd-cron, handles the execution of timer units.
- D.
Timer units only exist in the system scope and are not available for users.
- E.
Each systemd timer unit controls a specific systemd service unit.
- 23.Which of the following fields are available in the standard format of both the global /etc/crontab file as well as in user-specific crontab files? (Choose two.)
- A.
Year
- B.
Minute
- C.
Username
- D.
Effective group ID
- E.
Command
- 24.Which of the following commands should be executed when starting a login shell in order to change the language of messages for an internationalized program to Portuguese (pt)?
- A.
export LANGUAGE=“pt”
- B.
export LC_MESSAGES=“pt”
- C.
export UI_MESSAGES=“pt”
- D.
export MESSAGE=“pt”
- E.
export ALL_MESSAGES=“pt”
- 25.Which of the following files assigns a user to its primary group?
- A.
/etc/pgroup
- B.
/etc/shadow
- C.
/etc/passwd
- D.
/etc/group
- E.
/etc/gshadow
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