You Want to Configure Your Linux Firewall to Block All

question 64

Multiple Choice

You want to configure your Linux firewall to block all network traffic addressed to the Telnet service on the local system. Which of the following commands should you use?

• A)iptables -t filter -A INPUT -s 0/0 -p tcp -dport 23 -j DROP
• B)iptables -t filter -A OUTPUT -s 0/0 -p tcp -dport 23 -j DROP
• C)iptables -t filter -A INPUT -s 0/0 -p tcp -dport 80 -j DROP
• D)iptables -t filter -A INPUT -s 0/0 -p tcp -dport 53 -j ACCEPT

---

Definitions:

Downward Pressure

A situation in which there is a driving force causing prices or values to decrease, often seen in markets or economics.

Buyers

Individuals or entities that purchase goods or services.

Downward Pressure

Forces that cause the value or price of something to decrease.

Reverse Auction

A type of auction in which the roles of buyer and seller are reversed, with sellers competing to obtain business from the buyer by offering the lowest price for their goods or services.