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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RIGHT
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WRONG
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Either A or B
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None of the above
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Detailed explanation-1: -The mangle table is used to alter the IP headers of the packet in various ways. For instance, you can adjust the TTL (Time to Live) value of a packet, either lengthening or shortening the number of valid network hops the packet can sustain. Other IP headers can be altered in similar ways.
Detailed explanation-2: -mangle: This table is used for specialized packet alteration. Until kernel 2.4. 17 it had two built-in chains: PREROUTING (for altering incoming packets before routing) and OUTPUT (for altering locally-generated packets before routing).
Detailed explanation-3: -They are as follows: filter-The default table for handling network packets. nat-Used to alter packets that create a new connection and used for Network Address Translation (NAT). mangle-Used for specific types of packet alteration.
Detailed explanation-4: -NAT is used to rewrite the source and/or destination of packets and/or track connections. MANGLE is used to otherwise modify packets, i.e. modifying various portions of a TCP header, etc.