Linux+ Linux+ Networking Services and Protocols 3

Question 1

Which firewall management daemon uses zones to control traffic and serves as a front-end for nftables on many modern Linux distributions?

Accepted Answer

firewalld

Answer

firewalld is a dynamic firewall daemon that manages nftables/iptables rules using zone-based policies and supports runtime and permanent rule changes.

Question 2

What does the command `scp report.txt admin@192.168.1.10:/var/log/` accomplish?

Accepted Answer

Securely copies report.txt to /var/log/ on the remote host over SSH

Answer

scp (Secure Copy Protocol) transfers files between hosts encrypted over SSH using the syntax: source destination.

Question 3

Which file controls the order in which name resolution sources (files, DNS, etc.) are queried on a Linux system?

Accepted Answer

/etc/nsswitch.conf

Answer

/etc/nsswitch.conf (Name Service Switch) defines the lookup order for databases such as hostname resolution, users, and groups.

Question 4

Which command sends ICMP echo requests to a host to test basic network reachability?

Accepted Answer

ping

Answer

ping sends ICMP echo request packets to a target and reports round-trip time, confirming whether the host is reachable at the IP layer.

Question 5

Which firewall-cmd option ensures that a newly added rule survives a system reboot?

Accepted Answer

--permanent

Answer

The --permanent flag writes the firewall rule to the permanent configuration so it is restored after a reboot or firewalld reload.

Linux Practice Test

Linux Practice Test

Linux+ Linux+ Networking Services and Protocols 3