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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Protocols and ports
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Layer 7 Protocol
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Address list
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content
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mangle
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Detailed explanation-1: -The packet filtering firewall filters IP packets based on source and destination IP address, and source and destination port.
Detailed explanation-2: -IP filtering and network address translation (NAT) act like a firewall to protect your internal network from intruders. IP filtering lets you control what IP traffic will be allowed into and out of your network. Basically, it protects your network by filtering packets according to the rules that you define.
Detailed explanation-3: -Proxy firewalls, also known as application-level firewalls, filter network traffic at the application layer of the OSI network model. As an intermediary between two systems, proxy firewalls monitor traffic at the application layer (protocols at this layer include HTTP and FTP).
Detailed explanation-4: -There are two main types of packet-filtering firewalls: stateless, or static packet-filtering, and stateful, or dynamic packet-filtering. Stateful firewalls are undeniably the more advanced of the two, but there are still qualified uses for stateless firewalls as well.