LFCS Certification Network Service Configuration 4

Question 1

Which command shows active network connections, their state (ESTABLISHED, LISTEN, etc.) using the ss utility?

Accepted Answer

ss -a

Answer

ss -a displays all sockets including both listening and non-listening (established) connections.

Question 2

You need to configure a static IP on a system using NetworkManager. Which command-line tool should you use?

Accepted Answer

nmcli con mod eth0 ipv4.addresses 192.168.1.5/24

Answer

nmcli con mod modifies a NetworkManager connection profile to persist the static IP across reboots.

Question 3

What is the function of the /etc/nsswitch.conf file in name resolution?

Accepted Answer

Defines the order of sources (files, DNS) for name lookups

Answer

/etc/nsswitch.conf controls which databases (files, dns, myhostname) are consulted and in what order for lookups.

Question 4

A Samba share should be writable by members of the 'staff' group. Which smb.conf directive sets this group?

Accepted Answer

write list = @staff

Answer

write list = @staff grants write permission to members of the staff group even if the share is read-only by default.

Question 5

Which command tests that an SMTP server on localhost accepts connections on port 25?

Accepted Answer

telnet localhost 25

Answer

telnet to port 25 opens a raw TCP session letting you interact with the SMTP banner and issue commands.

LFCS Certification Practice Test