A Linux administrator is configuring a CUPS print service on a Linux machine and needs to allow only connections from a local network. Which of the following commands should the administrator use?

The correct answer is C. iptables -A INPUT -s 192.168.100.0/24 --dport 631 -p tcp -j ACCEPT. Allowing access to the CUPS service requires permitting incoming TCP connections to port 631 from the local network. Adding an INPUT rule with the source network and destination port 631 ensures only hosts on that subnet can connect to the print service.

Security

Question

Options

Aiptables -A OUTPUT -d 192.168.100.0/24 --sport 631 -p tcp -j ACCEPT
Biptables -A OUTPUT -s 192.168.100.0/24 --dport 631 -p tcp -j ACCEPT
Ciptables -A INPUT -s 192.168.100.0/24 --dport 631 -p tcp -j ACCEPT
Diptables -D INPUT -d 192.168.100.0/24 --dport 631 -p tcp -j ACCEPT

How the community answered

(20 responses)

A
25% (5)
B
5% (1)
C
60% (12)
D
10% (2)

Explanation

Allowing access to the CUPS service requires permitting incoming TCP connections to port 631 from the local network. Adding an INPUT rule with the source network and destination port 631 ensures only hosts on that subnet can connect to the print service.

Topics

#iptables#CUPS#firewall rules#INPUT chain

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