FUNDAMENTALS OF COMPUTER

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COMPUTER THREATS SECURITY

WHAT IS A FIREWALL IN NETWORK SECURITY

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
The chains available in the filter rule are useful for processing data packet traffic that enters the router through the interface on the router and has the destination IP address in the form of an ip contained on the router is ____
A
Forward
B
Srcnat
C
Input
D
output
E
dstnat
Explanation: 

Detailed explanation-1: -An Internet Protocol (IP) packet filter firewall allows you to create a set of rules that either discard or accept traffic over a network connection.

Detailed explanation-2: -The first firewalls were packet-filtering firewalls that work at the Network layer of the OSI networking model. They examine the packet headers that contain IP addresses and packet options and block or allow traffic through the firewall based on that information.

Detailed explanation-3: -The <command> option dictates a specific action to perform, such as appending or deleting the rule specified by the <chain-name> option.

Detailed explanation-4: -Standard SYN Scan The RST packet makes closed ports easy for Nmap to recognize. Filtering devices such as firewalls, on the other hand, tend to drop packets destined for disallowed ports.

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