COMPUTER THREATS SECURITY
WHAT IS A FIREWALL IN NETWORK SECURITY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which of the string sets below is preconfigured in the NAT table of the Linux iptables command?
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INPUT, FORWARD e OUTPUT
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INPUT, NAT e OUTPUT
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INPUT, ROUTING e OUTPUT
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PREROUTING, FORWARD e POSTROUTING
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PREROUTING, OUTPUT e POSTROUTING
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Explanation:
Detailed explanation-1: -NAT is the built-in table in iptables. Usually, we use the nat table for address translation. The chains in the nat table are PREROUTING, INPUT, OUTPUT, and POSTROUTING. Iptables use nat rules for address translation tasks like forwarding. The filter table is the default table.
Detailed explanation-2: -PREROUTING-Alters incoming network packets before they are routed. POSTROUTING-Alters network packets before they are sent out.
Detailed explanation-3: -Linux and Netfilter We will use the command utility ‘iptables’ to create complex rules for modification and filtering of packets. The important rules regarding NAT are-not very surprising-found in the ‘nat’-table.
There is 1 question to complete.